diff --git a/BUGS.md b/BUGS.md
index fe3e170..55c330f 100644
--- a/BUGS.md
+++ b/BUGS.md
@@ -1,3 +1,4 @@
 ## Bugs
 * regular for loop (for i = 0; i < n; i++) doesn't work at all, error unexpected "{"
-* print sizeof void (0) as Array: result is still array, not number
\ No newline at end of file
+* new operator works incorrectly
+<!--* object property as a function call is returned without clarificationl-->
\ No newline at end of file
diff --git a/bin/Math.bs b/bin/Math.bs
deleted file mode 100644
index 2d08a79..0000000
--- a/bin/Math.bs
+++ /dev/null
@@ -1,2 +0,0 @@
-const sin = Math.sin.bind(Math),
-    cos = Math.cos.bind(Math)
\ No newline at end of file
diff --git a/bin/Math.js b/bin/Math.js
deleted file mode 100644
index 1623b20..0000000
--- a/bin/Math.js
+++ /dev/null
@@ -1,426 +0,0 @@
-if (!globalThis) { globalThis = window || global || this || {}; } try { globalThis.require = require; } catch (err) { globalThis.require = () => undefined; } 
-                globalThis.BS = {
-    Node (tagName, id, className, attributes, children) {
-        let el = document.createElement(tagName);
-        id && (el.id = id);
-        className && (el.className = className); 
-        if (children) {
-            el.append(children);
-        }
-        if (typeof attributes == 'object') {
-            for(let i in attributes) {
-                el.setAttribute(i, attributes[i]);
-            }
-        }
-        return el;
-    },
-    DOMtoJSON (node) { 
-        node = node || this;
-        let obj = {
-            nodeType: node.nodeType
-        };
-        if (node.tagName) {
-            obj.tagName = node.tagName.toLowerCase();
-        } else
-        if (node.nodeName) {
-            obj.nodeName = node.nodeName;
-        }
-        if (node.nodeValue) {
-            obj.nodeValue = node.nodeValue;
-        }
-        let attrs = node.attributes;
-        let childNodes = node.childNodes;
-        let length;
-        let arr;
-        if (attrs) {
-            length = attrs.length;
-            arr = obj.attributes = new Array(length);
-            for (let i = 0; i < length; i++) {
-                const attr = attrs[i];
-                arr[i] = [attr.nodeName, attr.nodeValue];
-            }
-        }
-        if (childNodes) {
-            length = childNodes.length;
-            arr = obj.childNodes = new Array(length);
-            for (let i = 0; i < length; i++) {
-                arr[i] = this.DOMtoJSON(childNodes[i]);
-            }
-        }
-        return obj;
-    },
-    valueToDOM (value) {
-        if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || value === null || value === void 0) {
-            return value + '';
-        }
-        if (BS.types['HTML'](value)) { 
-            return value;
-        }
-        return document.createTextNode(value);
-    },
-    cloneNode (value) {
-        let clone = value.cloneNode(true);
-        return clone;
-    },
-    through (value0, value1, line, col) {
-        if (typeof value0 != 'number' || typeof value1 != 'number') {
-            throw new TypeError(`Number is expected on the line ${line}, col ${col}.`);
-        }
-        let output = [];
-        let min = Math.min(value0, value1);
-        let max = Math.max(value0, value1);
-        for (let i = min; i <= max; i++) {
-            output.push(i);
-        }
-        if (value0 != min)
-            output = output.reverse()
-        return output;
-    },
-    delete (value, index) {   
-        Array.prototype.splice.call(value, index, 1);
-        return value;
-    },
-    slice (value, start, end, step = 1, line, col) {
-        if (!Array.isArray(value) && typeof value != 'string') {
-            throw new TypeError(`Array or string was expected at line ${line}, col ${col}`);
-        }
-        if (typeof start != 'number') {
-            throw new TypeError(`Number was expected at line ${line}, col ${col}`)
-        }
-        if (end === null && step === null) {
-            return value.slice(start)
-        }
-        step = step|0;
-        if (step >= 0) step = 1;
-        else step = -1;   
-        let result = value.slice(start, end);
-        if (step === -1) {
-            if (typeof value === 'string')
-                return Array.from(result).reverse().join('');
-            return result.reverse();
-        }
-        return result;
-    },
-    ast: (function () {
-        let r = globalThis.require('./index.js');
-        if (r) return r;
-        return function () {console.warn('Ast is not supported yet in browsers.')}
-    })(),
-    parse: (function () {
-        let r = globalThis.require('./ast_to_js.js');
-        if (r) return r;
-        return function () {console.warn('@eval is not supported yet in browsers.')}
-    })(),
-    fs: (function () {
-        let r = globalThis.require('fs');
-        if (r) return r;
-        return function () {console.warn('@import is not supported yet in browsers.')};
-    })(),
-    types: {
-        Array (value) {
-            return Array.isArray(value);
-        },
-        Null (value) {
-            return value === null;
-        },
-        Undefined (value) {
-            return value === void 0;
-        },
-        Int (value) {
-            return parseInt(value) === value && !Number.isNaN(value);
-        },
-        Float (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        Number (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        NaN (value) {
-            return Number.isNaN(value);
-        },
-        String (value) {
-            return typeof value === 'string';
-        },
-        Function (value) {
-            return typeof value === 'function';
-        },
-        Symbol (value) {
-            return typeof value === 'symbol';
-        },
-        Boolean (value) {
-            return typeof value === 'boolean';
-        },
-        HTML (value) {
-            return value instanceof Element;
-        },
-        Object (value) {
-            return typeof value === 'object' && value !== null;
-        },
-    },
-    convert (value, type) {
-        let t = this.getType(value);
-        if (t) t = t.toLowerCase();
-        let tmp = null;
-        if (typeof type !== 'object' && t == type.toLowerCase()) return value;
-        let gt = function (value, type) {
-            switch (type) {
-                case 'Number':
-                case 'Float':
-                    tmp = parseFloat(value);
-                    if (isNaN(tmp)) return 0;
-                    return tmp;
-                case 'Int':
-                    return value|0;
-                case 'String':
-                    if (t == 'html') return JSON.stringify(this.DOMtoJSON(value));
-                    if (t == 'array') return value.join('');
-                    if (t == 'object') return JSON.stringify(value);
-                    if (t == 'boolean') return !!value;
-                    if (t == 'null') return 'null';
-                    if (t == 'undefined') return 'undefined';
-                    else return value.toString();
-                case 'Array':
-                    if (t == 'html') return Object.values(this.DOMtoJSON(value));
-                    if (t == 'object') return Object.values(value);
-                    if (t == 'string') {
-                        try {
-                            let z = JSON.parse(t);
-                            let v = this.getType(z) == 'array';
-                            if (v) return z;
-                            throw 'err';
-                        } catch (err) {}
-                        return value.split('');
-                    }
-                    if (t == 'number' || t == 'int' || t == 'float') {
-                        return (''+value).split('');
-                    }
-                    else return [value];
-                case 'JSON':
-                    if (t == 'html') return this.DOMtoJSON(value);
-                    if (t == 'object' || t == 'string' || t == 'array' || t == 'null' || t == 'number' )
-                        return value;
-                    throw new TypeError(`Cannot convert ${t} to ${type}`);
-                case 'Object':
-                    return Object(value);
-                case 'Boolean':
-                    return Boolean(value);
-                case 'List':
-                    if (t == 'object' || t == 'array' || t == 'html') {
-                        let ul = document.createElement('ul');
-                        for (let i in value) {
-                            let li = document.createElement('li');
-                            if (t == 'object') {
-                                let span = document.createElement('span');
-                                span.className = 'convert_key';
-                                span.innerText = i;
-                                li.append(span);
-                                li.appendChild(document.createTextNode(': '));
-                            }
-                            let span = document.createElement('span');
-                            span.className = 'convert_value';
-                            if (this.getType(value[i]) == 'string') {
-                                span.className += ' string';
-                                span.innerText = `"${value[i]}"`;
-                            } else if (this.getType(value[i]) == 'number') {
-                                span.className += ' number';
-                                span.innerText = `${value[i]}`;
-                            } else if (this.getType(value[i]) == 'array') {
-                                span.className += ' array';
-                                span.innerText = JSON.stringify(value[i], null, 2);
-                            }
-                            else span.innerText = `${value[i]}`;
-                            li.append(span);
-                            ul.append(li);
-                        }
-                        return ul;
-                    }
-                    return document.createElement('ul');
-            };
-        };
-        if (typeof type != 'string') {
-            let r = value; 
-            console.log(type.length);
-            for (let i = 0; i < type.length; i++) {
-                r = gt(r, type[i]);
-                console.log({r, type: type[i]});
-                if (i != length -1) {
-                    if (r.map) {
-                        r = r.map(j => {
-                            console.log({each: this.convert(j, type[i+1]), type: type[i+1]});
-                            return this.convert(j, type[i+1]);
-                        });
-                    }
-                }
-                console.log(r);
-            }
-        }; 
-        return gt(value, type);
-    },
-    getType (value) {
-        for (let i in this.types) {
-            try {
-                if (this.types[i](value)) return i;
-            } catch (err) {continue}
-        }
-    },
-    sizeof(object) {  
-        if (object instanceof Set || object instanceof Map)
-            return object.size;
-        if (object instanceof Array || object instanceof String)
-            return object.length;
-        if (object instanceof Object)
-            return Object.keys(object).length; 
-        if (object === void 0 || object === null) {
-            return 0 
-        }
-        return Object.keys(object).length;
-    },
-    deepFreeze (object) { 
-        const propNames = Object.getOwnPropertyNames(object); 
-        for (const name of propNames) {
-            const value = object[name];
-
-            if (value && typeof value === "object") {
-                BS.deepFreeze(value);
-            }
-        }
-        return Object.freeze(object);
-    },
-    last(number) { 
-        if (number > 0) return number - 1
-        return 0
-    },
-    storage: [], 
-};
-const BS = globalThis.BS;
-try {
-    Element;
-} catch {
-    globalThis.Element = {prototype: {}};
-    Element = globalThis.Element;
-}
-Element.prototype._append = Element.prototype.append;
-Element.prototype.append = function (children) {
-    if (Array.isArray(children)) {
-        for (let i = 0, l = children.length; i < l; i++) {
-            this._append(children[i]);
-        }
-    } else {
-        this._append(children);
-    }
-    return this;
-};
-Element.prototype.json = function () {
-    return globalThis.BS.DOMtoJSON(this);
-};
-Element.prototype.text = function (content) {
-    if (content === void 0) {
-        return this.textContent;
-    }
-    this.textContent = content;
-    return this;
-};
-Element.prototype.listen = function (event, callback) {
-    this.addEventListener(event, callback);
-    return this;
-};
-Element.prototype.css = function (obj) {
-    for (let i in obj) {
-        this.style[i] = obj[i];
-    }
-    return this;
-};
-Element.prototype.events = function (obj) {
-    for (let i in obj) {
-        this.addEventListener(i, obj[i]);
-    }
-    return this;
-};    
-function list (amount, callback) {
-    let array = [];
-    for (let i = 0; i < amount; i++) {
-        if (typeof callback === 'function') {
-            console.log(i);
-            array.push(callback(i));
-        } else {
-            array.push(callback);
-        }
-    }
-    return array;
-}
-function range(start, stop, include = false){
-    if (stop === undefined) {
-        stop = start;
-        start = 0;
-    }
-    if (include) {
-        if (start > stop) {
-            stop--;
-        } else {
-            stop++
-        }
-    }
-    let i = start; 
-    return { 
-        [Symbol.iterator]:() => { 
-            return { 
-                next () {
-                    while(i !== stop){
-                        let temp = i;
-                        if (start > stop) i--;
-                        else i++;
-                        return {
-                            value: temp,
-                            done: false
-                        }
-                    }
-                    return {done: true}
-                }
-            }
-        }
-    }
-}
-const PI = 3.141592653589793,
-    E = 2.718281828459045,
-    log = (...args) => console.log(...args),
-    sqrt = Math.sqrt.bind(Math),
-    Time = {
-        get now () {
-            return Date.now()
-        },
-        get ms () {
-            return new Date().getMilliseconds()
-        },
-        get seconds () {
-            return new Date().getSeconds()
-        },
-        get minutes () {
-            return new Date().getMinutes()
-        },
-        get hours () {
-            return new Date().getHours()
-        },
-        get day () {
-            return new Date().getDay()
-        },
-        get month () {
-            return new Date().getMonth()
-        },
-        get year () {
-            return new Date().getFullYear()
-        },
-    },
-    sizeof = function sizeof (object) {
-        if (object === void 0 || object === null) {
-            throw new TypeError('Cannot convert undefined or null to object');
-        }
-        if (object instanceof Set || object instanceof Map)
-            return object.size;
-        return Object.keys(object).length;
-    };
-
-
-// your code below this line
-
-const sin = BS.deepFreeze(Math.sin.bind(Math)),
-    cos = BS.deepFreeze(Math.cos.bind(Math));
\ No newline at end of file
diff --git a/bin/Random.bs b/bin/Random.bs
deleted file mode 100644
index 585488d..0000000
--- a/bin/Random.bs
+++ /dev/null
@@ -1,6 +0,0 @@
-random = function (Int? min = 0, Int? max = 1) {
-    return Math.floor(Math.random() * (max - min) + min)
-}
-random.string = function (length) {
-    return '' // FIX
-}
\ No newline at end of file
diff --git a/bin/Random.js b/bin/Random.js
deleted file mode 100644
index ed9d7ef..0000000
--- a/bin/Random.js
+++ /dev/null
@@ -1,435 +0,0 @@
-if (!globalThis) { globalThis = window || global || this || {}; } try { globalThis.require = require; } catch (err) { globalThis.require = () => undefined; } 
-                globalThis.BS = {
-    Node (tagName, id, className, attributes, children) {
-        let el = document.createElement(tagName);
-        id && (el.id = id);
-        className && (el.className = className); 
-        if (children) {
-            el.append(children);
-        }
-        if (typeof attributes == 'object') {
-            for(let i in attributes) {
-                el.setAttribute(i, attributes[i]);
-            }
-        }
-        return el;
-    },
-    DOMtoJSON (node) { 
-        node = node || this;
-        let obj = {
-            nodeType: node.nodeType
-        };
-        if (node.tagName) {
-            obj.tagName = node.tagName.toLowerCase();
-        } else
-        if (node.nodeName) {
-            obj.nodeName = node.nodeName;
-        }
-        if (node.nodeValue) {
-            obj.nodeValue = node.nodeValue;
-        }
-        let attrs = node.attributes;
-        let childNodes = node.childNodes;
-        let length;
-        let arr;
-        if (attrs) {
-            length = attrs.length;
-            arr = obj.attributes = new Array(length);
-            for (let i = 0; i < length; i++) {
-                const attr = attrs[i];
-                arr[i] = [attr.nodeName, attr.nodeValue];
-            }
-        }
-        if (childNodes) {
-            length = childNodes.length;
-            arr = obj.childNodes = new Array(length);
-            for (let i = 0; i < length; i++) {
-                arr[i] = this.DOMtoJSON(childNodes[i]);
-            }
-        }
-        return obj;
-    },
-    valueToDOM (value) {
-        if (typeof value === 'string' || typeof value === 'number' || typeof value === 'boolean' || value === null || value === void 0) {
-            return value + '';
-        }
-        if (BS.types['HTML'](value)) { 
-            return value;
-        }
-        return document.createTextNode(value);
-    },
-    cloneNode (value) {
-        let clone = value.cloneNode(true);
-        return clone;
-    },
-    through (value0, value1, line, col) {
-        if (typeof value0 != 'number' || typeof value1 != 'number') {
-            throw new TypeError(`Number is expected on the line ${line}, col ${col}.`);
-        }
-        let output = [];
-        let min = Math.min(value0, value1);
-        let max = Math.max(value0, value1);
-        for (let i = min; i <= max; i++) {
-            output.push(i);
-        }
-        if (value0 != min)
-            output = output.reverse()
-        return output;
-    },
-    delete (value, index) {   
-        Array.prototype.splice.call(value, index, 1);
-        return value;
-    },
-    slice (value, start, end, step = 1, line, col) {
-        if (!Array.isArray(value) && typeof value != 'string') {
-            throw new TypeError(`Array or string was expected at line ${line}, col ${col}`);
-        }
-        if (typeof start != 'number') {
-            throw new TypeError(`Number was expected at line ${line}, col ${col}`)
-        }
-        if (end === null && step === null) {
-            return value.slice(start)
-        }
-        step = step|0;
-        if (step >= 0) step = 1;
-        else step = -1;   
-        let result = value.slice(start, end);
-        if (step === -1) {
-            if (typeof value === 'string')
-                return Array.from(result).reverse().join('');
-            return result.reverse();
-        }
-        return result;
-    },
-    ast: (function () {
-        let r = globalThis.require('./index.js');
-        if (r) return r;
-        return function () {console.warn('Ast is not supported yet in browsers.')}
-    })(),
-    parse: (function () {
-        let r = globalThis.require('./ast_to_js.js');
-        if (r) return r;
-        return function () {console.warn('@eval is not supported yet in browsers.')}
-    })(),
-    fs: (function () {
-        let r = globalThis.require('fs');
-        if (r) return r;
-        return function () {console.warn('@import is not supported yet in browsers.')};
-    })(),
-    types: {
-        Array (value) {
-            return Array.isArray(value);
-        },
-        Null (value) {
-            return value === null;
-        },
-        Undefined (value) {
-            return value === void 0;
-        },
-        Int (value) {
-            return parseInt(value) === value && !Number.isNaN(value);
-        },
-        Float (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        Number (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        NaN (value) {
-            return Number.isNaN(value);
-        },
-        String (value) {
-            return typeof value === 'string';
-        },
-        Function (value) {
-            return typeof value === 'function';
-        },
-        Symbol (value) {
-            return typeof value === 'symbol';
-        },
-        Boolean (value) {
-            return typeof value === 'boolean';
-        },
-        HTML (value) {
-            return value instanceof Element;
-        },
-        Object (value) {
-            return typeof value === 'object' && value !== null;
-        },
-    },
-    convert (value, type) {
-        let t = this.getType(value);
-        if (t) t = t.toLowerCase();
-        let tmp = null;
-        if (typeof type !== 'object' && t == type.toLowerCase()) return value;
-        let gt = function (value, type) {
-            switch (type) {
-                case 'Number':
-                case 'Float':
-                    tmp = parseFloat(value);
-                    if (isNaN(tmp)) return 0;
-                    return tmp;
-                case 'Int':
-                    return value|0;
-                case 'String':
-                    if (t == 'html') return JSON.stringify(this.DOMtoJSON(value));
-                    if (t == 'array') return value.join('');
-                    if (t == 'object') return JSON.stringify(value);
-                    if (t == 'boolean') return !!value;
-                    if (t == 'null') return 'null';
-                    if (t == 'undefined') return 'undefined';
-                    else return value.toString();
-                case 'Array':
-                    if (t == 'html') return Object.values(this.DOMtoJSON(value));
-                    if (t == 'object') return Object.values(value);
-                    if (t == 'string') {
-                        try {
-                            let z = JSON.parse(t);
-                            let v = this.getType(z) == 'array';
-                            if (v) return z;
-                            throw 'err';
-                        } catch (err) {}
-                        return value.split('');
-                    }
-                    if (t == 'number' || t == 'int' || t == 'float') {
-                        return (''+value).split('');
-                    }
-                    else return [value];
-                case 'JSON':
-                    if (t == 'html') return this.DOMtoJSON(value);
-                    if (t == 'object' || t == 'string' || t == 'array' || t == 'null' || t == 'number' )
-                        return value;
-                    throw new TypeError(`Cannot convert ${t} to ${type}`);
-                case 'Object':
-                    return Object(value);
-                case 'Boolean':
-                    return Boolean(value);
-                case 'List':
-                    if (t == 'object' || t == 'array' || t == 'html') {
-                        let ul = document.createElement('ul');
-                        for (let i in value) {
-                            let li = document.createElement('li');
-                            if (t == 'object') {
-                                let span = document.createElement('span');
-                                span.className = 'convert_key';
-                                span.innerText = i;
-                                li.append(span);
-                                li.appendChild(document.createTextNode(': '));
-                            }
-                            let span = document.createElement('span');
-                            span.className = 'convert_value';
-                            if (this.getType(value[i]) == 'string') {
-                                span.className += ' string';
-                                span.innerText = `"${value[i]}"`;
-                            } else if (this.getType(value[i]) == 'number') {
-                                span.className += ' number';
-                                span.innerText = `${value[i]}`;
-                            } else if (this.getType(value[i]) == 'array') {
-                                span.className += ' array';
-                                span.innerText = JSON.stringify(value[i], null, 2);
-                            }
-                            else span.innerText = `${value[i]}`;
-                            li.append(span);
-                            ul.append(li);
-                        }
-                        return ul;
-                    }
-                    return document.createElement('ul');
-            };
-        };
-        if (typeof type != 'string') {
-            let r = value; 
-            console.log(type.length);
-            for (let i = 0; i < type.length; i++) {
-                r = gt(r, type[i]);
-                console.log({r, type: type[i]});
-                if (i != length -1) {
-                    if (r.map) {
-                        r = r.map(j => {
-                            console.log({each: this.convert(j, type[i+1]), type: type[i+1]});
-                            return this.convert(j, type[i+1]);
-                        });
-                    }
-                }
-                console.log(r);
-            }
-        }; 
-        return gt(value, type);
-    },
-    getType (value) {
-        for (let i in this.types) {
-            try {
-                if (this.types[i](value)) return i;
-            } catch (err) {continue}
-        }
-    },
-    sizeof(object) {  
-        if (object instanceof Set || object instanceof Map)
-            return object.size;
-        if (object instanceof Array || object instanceof String)
-            return object.length;
-        if (object instanceof Object)
-            return Object.keys(object).length; 
-        if (object === void 0 || object === null) {
-            return 0 
-        }
-        return Object.keys(object).length;
-    },
-    deepFreeze (object) { 
-        const propNames = Object.getOwnPropertyNames(object); 
-        for (const name of propNames) {
-            const value = object[name];
-
-            if (value && typeof value === "object") {
-                BS.deepFreeze(value);
-            }
-        }
-        return Object.freeze(object);
-    },
-    storage: [], 
-};
-const BS = globalThis.BS;
-try {
-    Element;
-} catch {
-    globalThis.Element = {prototype: {}};
-    Element = globalThis.Element;
-}
-Element.prototype._append = Element.prototype.append;
-Element.prototype.append = function (children) {
-    if (Array.isArray(children)) {
-        for (let i = 0, l = children.length; i < l; i++) {
-            this._append(children[i]);
-        }
-    } else {
-        this._append(children);
-    }
-    return this;
-};
-Element.prototype.json = function () {
-    return globalThis.BS.DOMtoJSON(this);
-};
-Element.prototype.text = function (content) {
-    if (content === void 0) {
-        return this.textContent;
-    }
-    this.textContent = content;
-    return this;
-};
-Element.prototype.listen = function (event, callback) {
-    this.addEventListener(event, callback);
-    return this;
-};
-Element.prototype.css = function (obj) {
-    for (let i in obj) {
-        this.style[i] = obj[i];
-    }
-    return this;
-};
-Element.prototype.events = function (obj) {
-    for (let i in obj) {
-        this.addEventListener(i, obj[i]);
-    }
-    return this;
-};
-Array.prototype.last = function () {
-    return this[this.length - 1];
-};
-function list (amount, callback) {
-    let array = [];
-    for (let i = 0; i < amount; i++) {
-        if (typeof callback === 'function') {
-            console.log(i);
-            array.push(callback(i));
-        } else {
-            array.push(callback);
-        }
-    }
-    return array;
-}
-function range(start, stop, include = false){
-    if (stop === undefined) {
-        stop = start;
-        start = 0;
-    }
-    if (include) {
-        if (start > stop) {
-            stop--;
-        } else {
-            stop++
-        }
-    }
-    let i = start; 
-    return { 
-        [Symbol.iterator]:() => { 
-            return { 
-                next () {
-                    while(i !== stop){
-                        let temp = i;
-                        if (start > stop) i--;
-                        else i++;
-                        return {
-                            value: temp,
-                            done: false
-                        }
-                    }
-                    return {done: true}
-                }
-            }
-        }
-    }
-}
-const PI = 3.141592653589793,
-    E = 2.718281828459045,
-    log = (...args) => console.log(...args),
-    sqrt = Math.sqrt.bind(Math),
-    Time = {
-        get now () {
-            return Date.now()
-        },
-        get ms () {
-            return new Date().getMilliseconds()
-        },
-        get seconds () {
-            return new Date().getSeconds()
-        },
-        get minutes () {
-            return new Date().getMinutes()
-        },
-        get hours () {
-            return new Date().getHours()
-        },
-        get day () {
-            return new Date().getDay()
-        },
-        get month () {
-            return new Date().getMonth()
-        },
-        get year () {
-            return new Date().getFullYear()
-        },
-    },
-    sizeof = function sizeof (object) {
-        if (object === void 0 || object === null) {
-            throw new TypeError('Cannot convert undefined or null to object');
-        }
-        if (object instanceof Set || object instanceof Map)
-            return object.size;
-        return Object.keys(object).length;
-    };
-
-
-// your code below this line
-
-//(async function () {
-random = function(min = 0, max = 1) {
-    var arguments = Array.from(arguments || []);
-    if (!BS.types["Int"](min) && min !== null) throw new TypeError("Argument \"min\" is not type of Int at line 1, col 19.");
-    if (!BS.types["Int"](max) && max !== null) throw new TypeError("Argument \"max\" is not type of Int at line 1, col 19.");
-    return Math.floor(Math.random() * (max - min) + min);
-};
-random.string = function(length) {
-    var arguments = Array.from(arguments || []);
-    return "";
-};
-                //})();
\ No newline at end of file
diff --git a/bin/builtin/Date.js b/bin/builtin/Date.js
new file mode 100644
index 0000000..68b6940
--- /dev/null
+++ b/bin/builtin/Date.js
@@ -0,0 +1,84 @@
+class date {
+    constructor() {
+    }
+    get now() {
+        return Date.now()
+    }
+    // !TODO: implement
+    //setDate(value) {
+    //    if (typeof value != 'object' || value.constructor != Object) {
+    //        throw TypeError('setDate() expects an object.')
+    //    }
+    //    for (let i in value) {
+    //        if (typeof value[i] != 'number' || value[i] < 0 || isNaN(value[i])) {
+    //            throw TypeError('setDate() expects an object with positive number values.')
+    //        }
+    //    }
+    //    let _date = new Date();
+    //    if (value.hasOwnProperty('year')) {
+    //        _date.setFullYear(value.year);
+    //    }
+    //    if (value.hasOwnProperty('month')) {
+    //        _date.setMonth(value.month);
+    //    }
+    //    if (value.hasOwnProperty('day')) {
+    //        _date.setDate(value.day);
+    //    }
+    //    if (value.hasOwnProperty('hours')) {
+    //        _date.setHours(value.hours);
+    //    }
+    //    if (value.hasOwnProperty('minutes')) {
+    //        _date.setMinutes(value.minutes);
+    //    }
+    //    if (value.hasOwnProperty('seconds')) {
+    //        _date.setSeconds(value.seconds);
+    //    }
+    //    if (value.hasOwnProperty('milliseconds')) {
+    //        _date.setMilliseconds(value.milliseconds);
+    //    }
+    //    _date.prototype = date
+    //    return _date;
+    //}
+    get ms() {
+        return new Date().getMilliseconds()
+    }
+    get seconds() {
+        return new Date().getSeconds()
+    }
+    get msInSecond() {
+        return 1000
+    }
+    get minutes() {
+        return new Date().getMinutes()
+    }
+    get msInMinute() {
+        return 60000
+    }
+    get hours() {
+        return new Date().getHours()
+    }
+    get msInHour() {
+        return 3600000
+    }
+    get day() {
+        return new Date().getDay()
+    }
+    get msInDay() {
+        return 86400000
+    }
+    get month() {
+        return new Date().getMonth()
+    }
+    get msInMonth() {
+        return 2628000000
+    }
+    get year() {
+        return new Date().getFullYear()
+    }
+    get msInYear() {
+        return 31536000000
+    }
+};
+scopes.append_to_global({
+    Date: new date()
+});
\ No newline at end of file
diff --git a/bin/builtin/Math.js b/bin/builtin/Math.js
new file mode 100644
index 0000000..bbdd1e8
--- /dev/null
+++ b/bin/builtin/Math.js
@@ -0,0 +1,58 @@
+function expect_number(value, name) {
+    if (typeof value !== 'number' || isNaN(value)) {
+        throw new TypeError(`Unexpected type of argument for "${name}" function. "number" was expected`);
+    }
+    return value;
+}
+scopes.append_to_global({
+    sin: function (value) {
+        expect_number(value, 'sin');
+        return Math.sin(value);
+    },
+    cos: function (value) {
+        expect_number(value, 'cos');
+        return Math.cos(value);
+    },
+    tan: function (value) {
+        expect_number(value, 'tan');
+        return Math.tan(value);
+    },
+    atan: function (value) {
+        expect_number(value, 'atan');
+        return Math.atan(value);
+    },
+    atan2: function (value) {
+        expect_number(value, 'atan2');
+        return Math.atan2(value);
+    },
+    abs: function (value) {
+        expect_number(value, 'abs');
+        return Math.abs(value);
+    },
+    sqrt: function (value) {
+        expect_number(value, 'sqrt');
+        return Math.sqrt(value);
+    },
+    PI: Math.PI,
+    E: Math.E,
+    ceil: function ceil(value) {
+        expect_number(value, 'ceil');
+        return Math.ceil(value)
+    },
+    floor: function floor(value) {
+        expect_number(value, 'floor');
+        return ~~(value)
+    },
+    min: function min() {
+        for (let i = 0; i < arguments.length; i++) {
+            expect_number(arguments[i], 'min');
+        }
+        return Math.min.apply(null, arguments);
+    },
+    max: function max() {
+        for (let i = 0; i < arguments.length; i++) {
+            expect_number(arguments[i], 'max');
+        }
+        return Math.max.apply(null, arguments);
+    },
+});
\ No newline at end of file
diff --git a/bin/builtin/random.js b/bin/builtin/random.js
new file mode 100644
index 0000000..6e56bf9
--- /dev/null
+++ b/bin/builtin/random.js
@@ -0,0 +1,71 @@
+function expect_array_or_string(value, name) {
+    if (!Array.isArray(value) && typeof value !== 'string') {
+        throw new TypeError(`Unexpected type of argument for "random.${name}" function. "array" or "string" was expected`);
+    } else if (value.length == 0) {
+        throw new Error(`Unexpected empty array or string for "random.${name}" function`);
+    }
+    return value;
+}
+const random = {
+    ALPHABET: 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789',
+    getRandom() {
+        return Math.random();
+    },
+    int(min, max) {
+        if (typeof min != 'number' || isNaN(min) || typeof max != 'number' || isNaN(max)) {
+            throw new TypeError(`Unexpected type of argument for "random.int" function. "number" was expected`);
+        }
+        return ~~(random.getRandom() * (max|0 - min|0) + min|0);
+    },
+    intInclusive(min, max) {
+        if (typeof min != 'number' || isNaN(min) || typeof max != 'number' || isNaN(max)) {
+            throw new TypeError(`Unexpected type of argument for "random.intInclusive" function. "number" was expected`);
+        }
+        return random.int(min, max + 1);
+    },
+    float(min, max) {
+        if (typeof min != 'number' || isNaN(min) || typeof max != 'number' || isNaN(max)) {
+            throw new TypeError(`Unexpected type of argument for "random.float" function. "number" was expected`);
+        }
+        return random.getRandom() * (max - min) + min;
+    },
+    floatInclusive(min, max) {
+        if (typeof min != 'number' || isNaN(min) || typeof max != 'number' || isNaN(max)) {
+            throw new TypeError(`Unexpected type of argument for "random.floatInclusive" function. "number" was expected`);
+        }
+        return random.float(min, max + 1);
+    },
+    boolean() {
+        return random.getRandom() > 0.5;
+    },
+    element(array) {
+        expect_array_or_string(array, 'element');
+        return array[random.int(0, array.length)];
+    },
+    string(length) {
+        if (typeof length !== 'number' || isNaN(length)) {
+            throw new TypeError(`Unexpected type of argument for "random.string" function. "number" was expected`);
+        }
+        let result = '';
+        for (let i = 0; i < length; i++) {
+            result += random.element(random.ALPHABET);
+        }
+        return result;
+    },
+    stringFromSample(sample, length) {
+        if (typeof sample != 'string' || sample.length == 0) {
+            throw new TypeError(`Unexpected type of argument for "random.stringFromSample" function. "string" was expected`);
+        }
+        if (typeof length !== 'number' || isNaN(length)) {
+            throw new TypeError(`Unexpected type of argument for "random.stringFromSample" function. "number" was expected`);
+        }
+        let result = '';
+        for (let i = 0; i < length; i++) {
+            result += random.element(sample);
+        }
+        return result;
+    }
+}
+scopes.append_to_global({
+    random: random
+});
\ No newline at end of file
diff --git a/bin/utils.js b/bin/utils.js
index 4fd968a..a516897 100644
--- a/bin/utils.js
+++ b/bin/utils.js
@@ -1,22 +1,23 @@
+// ! This file writes the result of parsing to the final file
 const fs = require('fs');
 const path_join = require('path').join;
 const BS = require('../lib/compiler');
 const beautify = require('js-beautify').js;
-// const beautify = require('@wmhilton/beautify')
+//const minify = require('@node-minify/core');
+//const uglifyjs = require('@node-minify/uglify-js');
 const path_applied = process.cwd();
 
-let writeFile = (path, fileName, content) => {
+let writeFile = async (path, fileName, content, builtins = false) => {
     // TODO change the line below
     let ast = '';
     try {
         ast = JSON.parse(JSON.stringify(content, null, 4))
-        // console.clear();
         // later on for php files
         if (ast && ast.type && ast.type === 'decorator' && ast.decorator === '@php') {
             console.log('[File System]: Writing to: '+fileName+'.php');
             let ast_to_php = require('../lib/compiler/ast_to_php');
             var contentPHP = ast_to_php(ast);
-            let built_in = fs.readFileSync(`${__dirname}/../lib/compiler/built_in.php`, { encoding: 'utf-8'});
+            let built_in = fs.readFileSync(`${__dirname}/../lib/compiler/built_in/php/built_in.php`, { encoding: 'utf-8'});
             // beautify.php(`<?php ${contentPHP} ?>`, options).then(php => {
                 fs.writeFileSync(
                     `${path_join(path_applied, `/${fileName}.php`).replace(/\\/g, '/')}`,
@@ -33,39 +34,50 @@ let writeFile = (path, fileName, content) => {
             var contentJS = ast_to_js(ast);
             //contentJS = contentJS.slice(0, contentJS.length-6)
             contentJS += '\n';
-            let built_in = fs.readFileSync(`${__dirname}/../lib/compiler/built_in.js`, { encoding: 'utf-8'});
+            let built_in = '';
+            let prepend = '';
+            if (builtins) {
+                built_in = fs.readFileSync(`${__dirname}/../lib/compiler/built_in/js/built_in.js`, { encoding: 'utf-8' });
+                built_in += fs.readFileSync(`${__dirname}/../lib/compiler/built_in/js/scope.js`, { encoding: 'utf-8' });
+                built_in = built_in
+                    //.replace(/;\s+(if|else\s|for|while|do|return(\s)|try|catch)\s*/g, ';$1$2')
+                    //.replace(/else\s+if/g, 'else if')
+                    .replace(/[ \t]*\/\/[^\n]*/g, ' ')
+                    .replace(/(\r\n?)+\s*/g, ' ')
+                    .replace(/[ \t]+/g, ' ')
+                    .replace(/\{\s+/g, '{')
+                    .replace(/\s+\}/g, '}')
+                    //.replace(/,\s+/g, ', ')
+                    .replace(/(?:\s*)(==?=?|<=?|>=?|!==?|\|\||&&)(?:\s*)/g, '$1');
+                built_in += '\n';
+                prepend = `if (!globalThis) {
+                    globalThis = window || global || this || {};
+                }
+                try {
+                    globalThis.require = require;
+                } catch (err) {
+                    globalThis.require = () => undefined;
+                }
+                `.replace(/\s*\/\/.*/g, '\n').replace(/\s+/g, ' ');
+                //await (async function () {
+                //    built_in = await minify({
+                //        content: built_in,
+                //        compressor: uglifyjs
+                //    });
+                //})();
+            }
             // fs.mkdirSync('./build/');
             // let p = fileName.split('\\').slice(0, -1);
             // console.log(p.join('/'))
             // if (!fs.existsSync(p.join('/'))) {
             //     fs.mkdirSync(`${path_applied}/${p.join('/')}`, {recursive: true})
             // }
-            let prepend = `if (!globalThis) {
-                globalThis = window || global || this || {};
-            }
-            try {
-                globalThis.require = require;
-            } catch (err) {
-                globalThis.require = () => undefined;
-            }
-            `.replace(/\s*\/\/.*/g, '\n').replace(/\s+/g, ' ');
             // console.log(path_join(path_applied, `/${fileName}.js`).replace(/\\/g, '/'))
             fs.writeFileSync(
                 `${(`${fileName}.js`).replace(/\\/g, '/')}`,
                 //`${path_join(path_applied, `/${fileName}.js`).replace(/\\/g, '/')}`,
-                `${prepend}
-                ${built_in
-                    //.replace(/;\s+(if|else\s|for|while|do|return(\s)|try|catch)\s*/g, ';$1$2')
-                    //.replace(/else\s+if/g, 'else if')
-                    //.replace(/[ \t]*\/\/[^\n]*/g, ' ')
-                    //.replace(/\n+/g, '\n')
-                    //.replace(/[ \t]+/g, ' ')
-                    //.replace(/\{\s+/g, '{')
-                    //.replace(/\s+\}/g, '}')
-                    //.replace(/,\s+/g, ', ')
-                    //.replace(/(?:\s*)(==?=?|<=?|>=?|!==?|\|\||&&)(?:\s*)/g, '$1')
-                }`
-                    +`\n\n// your code below this line\n\n`
+                `${prepend}${built_in}`
+                    +`// your code below this line\n\n`
                     +`${beautify(contentJS)}`
                 // beautify(`
                 //     ${contentJS}
@@ -90,19 +102,16 @@ module.exports = {
         if (!watch) {
             //path = path_join(dir, arg0)
             path = dir
-            if (!/\.bs$/i.test(path)) {
-                console.error(new Error('Provided file doesn\'t have .bs extension'));
+            if (!/\.b(s|m)$/i.test(path)) {
+                console.error(new Error('Provided file doesn\'t have .bs or .bm extension'));
                 process.exit()
             }
         } else {
             path = path_join(dir, path)
             //console.log(path)
         }
-        let fileName = path.substr(0, path.length - ('.bs'.length));
-        //console.dir(fs.promises)
-        //console.log(fs.existsSync(`${path}`))
-        //console.log(`${path_applied}${watch ? '/' + path : ''}`)
-        //process.exit()
+        let fileName = path.substr(0, path.length - 3); // '.bs'.length
+        let fileExtension = path.slice(-3);
         try {
             let content = '';
             if (!watch && fs.existsSync(`${path}`)) {
@@ -110,16 +119,17 @@ module.exports = {
             } else {
                 if (!fs.existsSync(`${path}`))
                     path = `${path_applied}${watch ? '\\' + path : ''}`;
-                //console.log(path)
-                //process.exit()
                 content = BS(path);
             }
             if (content === void 0) {
                 //console.log(']')
                 return;
             }
-            let result = writeFile(path, fileName, content);
-            // result !== void 0 && console.log(`[Output]: ${result}`);
+            let builtins = false;
+            if (fileExtension === '.bs') {
+                builtins = true;
+            }
+            writeFile(path, fileName, content, builtins);
             console.log('Compiled in ' + (Date.now() - date) + 'ms');
         } catch (err) {
             console.warn(new Error('Can\'t compile. Unexpected input.'));
diff --git a/index.js b/index.js
index 392c298..c82e837 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,7 @@ let lastFile = '';
 
 fs.watch(path_applied, { recursive: true }, function(event, path) {
     if (event != 'change') return;
-    if (!/\.bs$/i.test(path)) return;
+    if (!/\.b(s|m)$/i.test(path)) return;
     if (path == lastFile && lastChange + 10 > Date.now()) return;
     lastChange = Date.now();
     lastFile = path;
@@ -15,3 +15,6 @@ fs.watch(path_applied, { recursive: true }, function(event, path) {
     console.log(path, 'has', 'changed');
     utils.parse(path)
 });
+
+console.log('Watching', path_applied);
+console.log('Press Ctrl+C to exit');
diff --git a/lib/compiler/ast_to_js.js b/lib/compiler/ast_to_js.js
index 82e5286..273ae56 100644
--- a/lib/compiler/ast_to_js.js
+++ b/lib/compiler/ast_to_js.js
@@ -10,9 +10,19 @@ const libs = {
     //}
     get HTML() {
         return 'builtin/HTML.js'
+    },
+    get Math() {
+        return 'builtin/Math.js'
+    },
+    get random() {
+        return 'builtin/random.js'
+    },
+    get Date() {
+        return 'builtin/Date.js'
     }
 }
-module.exports = function parse (statements, tmp, isReturn) {
+let lvl = 0;
+module.exports = function parse (statements, tmp, isReturn, caller, prependStr = '') {
     // statememnts must be an array, if no, make it an array
     if (statements === void 0) {
         // something went wrong. This part should never be executed
@@ -40,21 +50,40 @@ module.exports = function parse (statements, tmp, isReturn) {
                             throw new Error(`Unknow library "${includes[i].value} at line ${includes[i].line}, column ${includes[i].col}"`);
                         let file = libs[includes[i].value];
                         let content = fs.readFileSync(`${__dirname.replace(/\\/g, '/')}/../../bin/${file}`, 'utf8');
-                        if (/\.bs$/i.test(file)) {
+                        if (/\.b(s|m)$/i.test(file)) {
                             // console.log(`${parse(to_ast(content))}`);
-                            result += `${parse(to_ast(content+'\n'))}`;
+                            result += `(function () {${parse(to_ast(content+'\n'))}})();`;
                         } else if (/\.js$/i.test(file)) {
-                            result += content;
+                            result += `(function () {${content}})();`;
                         } else {
                             throw new Error(`Unknow library "${includes[i].value} at line ${includes[i].line}, column ${includes[i].col}"`);
                         }
                     }
                     // result += parse(includes);
                 }
-                result += parse(value, 'isGloobal');
+                result += `(function () {
+                    ${parse(value, 'isGloobal')}
+                })();`
+                break;
+            case 'scope':
+                result += `const $${++lvl} = scopes.new(${lvl}, $${lvl - 1});`
+                result += prependStr || '';
+                if (caller == 'function')
+                    result += `$${lvl}.set("args", Array.from(arguments));`
+                result += `${parse(value)}
+                $clearScope($${lvl - 1}, scopes);`;
+                lvl--;
+                break;
+            case 'private':
+                result += `(function private () {
+                    const scopes = new Scopes();
+                    const $${++lvl} = scopes.global();
+                    ${parse(value)}
+                })();`;
+                lvl--;
                 break;
             case 'statement_value':
-                result += `${parse(value)};`;
+                result += `${parse(value, tmp, null, 'statement')};`;
                 break;
             case 'condition_group':
                 for (let i = 0; i < value.length; i++) {
@@ -65,16 +94,34 @@ module.exports = function parse (statements, tmp, isReturn) {
             case 'ternary':
                 result += `${parse(value)} ? ${parse(statement.left)} : ${statement.right === null ? null : parse(statement.right)}`;
                 break;
-            case 'delete':
-                if (value.type === 'item_retraction') {
-                    result += `BS.delete(${parse(value.from)}, ${parse(value.value)});`;
-                } else {
-                    result += `delete ${parse(value)};`
+            case 'free': {
+                let r = [];
+                value = value.value
+                for (let i = 0; i < value.length; i++) {
+                    if (value[i].value.type != 'identifier') {
+                        throw new Error(`Identifier expected for "free" statement at line ${value[i].line}, column ${value[i].col}"`);
+                    }
+                    r.push(parse(value[i], 'realValue'))
+                }
+                if (r.length > 1 || r.length < 1) {
+                    throw new Error(`"free" statement expected only one argument at line ${statement.line}, column ${statement.col}`);
                 }
+                r.push(`$${lvl}`);
+                result += `$free(${r.join(', ')});`;
                 break;
-            // case 'inherit':
-            //     result += `${parse(value)};`;
-            //     break;
+            }
+            case 'delete': {
+                let r = [];
+                value = value.value
+                for (let i = 0; i < value.length; i++) {
+                    r.push(parse(value[i], 'realValue'))
+                }
+                if (r.length > 2 || r.length < 2) {
+                    throw new Error(`"delete" statement expected exactly two arguments at line ${statement.line}, column ${statement.col}`);
+                }
+                result += `$delete(${r.join(', ')});`;
+                break;
+            }
             case 'debugger':
                 result += 'debugger;';
                 break;
@@ -83,7 +130,7 @@ module.exports = function parse (statements, tmp, isReturn) {
                 break;
             case 'var_assign':
                 if (statement.use_const) {
-                    result += `const ${parse(value, 'const')};`;
+                    result += `${parse(value, 'const')}`;
                     break;
                 }
                 var prepend = statement.use_let ? 'let' : ''
@@ -91,12 +138,13 @@ module.exports = function parse (statements, tmp, isReturn) {
                 let pr = prepend;
                 if (tmp == 'isGloobal')
                     pr = 'var';
-                result += `${pr} ${parse(value, prepend?.trim())};`;
+                result += `${parse(value, prepend || '', prepend && prepend.trim ? prepend.trim() : prepend)}`;
+                //result += `${pr} ${parse(value, prepend && prepend.trim ? prepend.trim() : prepend)};`;
                 break;
             case 'var_assign_group':
                 if (!!value.value) value = value.value;
                 for (let i = 0; i < value.length; i++) {
-                    r.push(`${parse(value[i], tmp)}`);
+                    r.push(`${parse(value[i], tmp)};`);
                 }
                 if (statement.identifier) {
                     if (tmp == 'const') {
@@ -106,12 +154,12 @@ module.exports = function parse (statements, tmp, isReturn) {
                     result += `${statement.identifier.value} = ${r.join()}`
                 }
                 else {
-                    result += `${r.join()}`;
+                    result += `${r.join('')}`;
                 }
                 break;
             case 'var_reassign':
                 if (tmp == 'const') {
-                    result += `${statement.identifier.value} = BS.deepFreeze(${parse([value])})`;
+                    result += `$${lvl}.set("${statement.identifier.value}", BS.deepFreeze(${parse(value)}), true, true)`;
                     break;
                 }
                 //if (tmp == 'Int') {
@@ -119,23 +167,24 @@ module.exports = function parse (statements, tmp, isReturn) {
                 //    break;
                 //}
                 if (typeof statement.identifier.value != 'string')
-                    result += `${parse(statement.identifier)} = ${parse([value])}`;
+                    result += `${parse(statement.identifier)} = ${parse(value)}`;
                 else if (value === void 0) {
                     result += statement.identifier.value;
                     break;
                 }
                 else
                     //result += `${statement.identifier.value} = BS.setValue("${statement.identifier.value}", ${statement.identifier.value}, ${parse(value)})`;
-                    result += `${statement.identifier.value} = ${parse(value)}`;
+                    //result += `${statement.identifier.value} = ${parse(value)}`;
+                    result += `$${lvl}.set("${statement.identifier.value}", ${parse(value)}${['Int', 'Array', 'Object', 'let', '\\'].includes(tmp) ? ', true' : ''})`;
                 break;
             case 'array':
-                result += '[';
+                result += 'BS.Array([';
                 for (let i = 0; i < value.length; i++) {
                     result += parse(value[i]);
                     if (i !== value.length -1)
                         result += ',';
                 }
-                result += ']';
+                result += '])';
                 break;
             case 'array_through':
                 result += `BS.through(${parse(value[0])}, ${parse(value[1])}, ${statement.line}, ${statement.col})`;
@@ -211,7 +260,7 @@ module.exports = function parse (statements, tmp, isReturn) {
                     v = parse(value);
                 }
                 if (statement.method == 'log' || statement.method == 'error') {
-                    result += `console.${statement.method}(${v});`
+                    result += `console.${statement.method}(get_clear_value(${v}));`
                 } else {
                     //let v = parse(value);
                     if (value.opening_tag) {
@@ -226,6 +275,9 @@ module.exports = function parse (statements, tmp, isReturn) {
             case 'bigInt':
                 result += value;
                 break;
+            case 'number_negative':
+                result += `-${parse(value)}`;
+                break;
             case 'SAVE':
                 result += `BS.storage.push(${parse(value)});`;
                 break;
@@ -242,11 +294,11 @@ module.exports = function parse (statements, tmp, isReturn) {
                 break;
             case 'string':
                 if (/\r\n/.test(value)) {
-                    result += `\`${value.replace(/\'/g, '\x27').replace(/"/g, '\x22').replace(/\`/g, '\x60')}\``
+                    result += `\`${value.replace(/\'/g, '\x27').replace(/"/g, '\x22').replace(/\`/g, '\x60').replace(/\$/g, '\x24')}\``
                     break;
                 }
                 //result += JSON.stringify(value)
-                result += `"${value.replace(/\'/g, '\x27').replace(/"/g, '\x22').replace(/\`/g, '\x60')}"`//value.indexOf('$') > -1 ? `\`${value}\`` : `${JSON.stringify(value)}`;
+                result += `"${value.replace(/\'/g, '\x27').replace(/"/g, '\x22').replace(/\`/g, '\x60').replace(/\$/g, '\x24')}"`//value.indexOf('$') > -1 ? `\`${value}\`` : `${JSON.stringify(value)}`;
                 break;
             case 'null':
                 result += null;
@@ -268,11 +320,25 @@ module.exports = function parse (statements, tmp, isReturn) {
                 result += `${from}.${parse(value)}`;
                 break;
             case 'dot_retraction_v2':
-                var from = parse(statement.from);
+                var from = parse(statement.from, tmp);
+                r = tmp == 'realValue' ? ', 1' : '';
                 if (value.type !== 'identifier') {
-                    result += `${from}.${parse(value)}`;
+                    if (tmp == 'delete') {
+                        result += `$delete(${from}, "${parse(value)}");`;
+                        break;
+                    }
+                    result += `$get(${from}, "${parse(value, tmp)}"${tmp})`;
+                    break;
                 }
-                    result += `${from}.${value.value}`;
+                if (tmp == 'delete') {
+                    if (statement.from.type != 'identifier') {
+                        result += `$${lvl}.set(${from}, $delete(${from}, "${value.value}"));`;
+                        break;
+                    }
+                    result += `$${lvl}.set("${statement.from.value}", $delete(${from}, "${value.value}"));`;
+                    break;
+                }
+                result += `$get(${from}, "${value.value}"${r})`;
                 break;
             // not used now ↓
             case 'double_dot_retraction':
@@ -307,6 +373,8 @@ module.exports = function parse (statements, tmp, isReturn) {
                 result += `${statement.sign}${parse(value)}`
                 break;
             case 'new':
+                result += `$new(${parse(value)})`
+                break;
             case 'await':
             case 'yield':
                 result += `${statement.type} ${parse(value)}`;
@@ -333,7 +401,6 @@ module.exports = function parse (statements, tmp, isReturn) {
                 }`;
                 break;
             case 'iife':
-                // statement.type = 'annonymous_function'
                 result += `(${parse(value)})(${statement.call_arguments.value.map(i => parse(i)).join(',')})`;
                 break;
             case 'annonymous_function': {
@@ -342,17 +409,25 @@ module.exports = function parse (statements, tmp, isReturn) {
                 res += `${statement.async ? 'async ' : ''}function ${statement.identifier ? statement.identifier.value : ''}`;
                 if (statement.arguments)
                     var t = parse(statement.arguments)
-                else var t = ['', ''];
+                else var t = ['', '', '', ''];
                 let use_strict = false;
-                if (/use strict/.test(statement.value[0]?.value?.value?.value)) {
-                    statement.value = statement.value.slice(1)
-                    use_strict = true;
-                }
+                //if (/use strict/.test(statement.value[0]?.value?.value?.value)) {
+                //    statement.value = statement.value.slice(1)
+                //    use_strict = true;
+                //}
                 res += `(${t.length ? t[0] : ''}) {
-                    ${use_strict ? '"use strict"' : ''}
-                    const args = Array.from(arguments || []);`
-                    + `${t.length ? t[1] + '\n' : ''}${parse(statement.value, statement.text)}
+                    ${parse(statement.value, statement.text, null, 'function',
+                        `${use_strict ? '"use strict"' : ''}`
+                        +`$${lvl+1}.set("this", $${lvl+1}.variables, true, true, true);`
+                        + `${t.length ? t[1] + '\n' : ''}`
+                        +`${t[2] ? t[2] : ''}`)
+                    }
+                    return null;
                 }`;
+                //lvl--;
+                if (caller == 'statement' && statement.identifier) {
+                    res = `$${lvl}.set("${statement.identifier.value}", ${res})`
+                }
                 if (statement.identifier) {
                     result += res;
                     break;
@@ -362,9 +437,9 @@ module.exports = function parse (statements, tmp, isReturn) {
             }
             case 'return':
                 if (value === void 0) {
-                    value = 'null';
+                    value = `$return($${lvl}, scopes, null)`;
                 } else {
-                    value = parse(value, tmp, isReturn);
+                    value = `$return($${lvl}, scopes, ${parse(value, tmp, isReturn)})`;
                 }
                 var t = '';
                 // switch (tmp) {
@@ -389,12 +464,20 @@ module.exports = function parse (statements, tmp, isReturn) {
                 // result += `${t ? t + 'else ' : ''} return ${value};`;
                 break;
             case 'identifier':
+                if (value == 'null') {
+                    result += 'null';
+                    break;
+                }
                 if (typeof value !== 'string') {
                     result += value.value;
                     break;
                 }
-                //result += `local.get("${value}")`;
-                result += value;
+                if (tmp == 'realValue') {
+                    result += `$${lvl}.get("${value}", 1)`;
+                    break;
+                }
+                result += `$${lvl}.get("${value}")`;
+                //result += value;
                 break;
             case 'global':
                 result += `let ${value.value} = (globalThis !== null && globalThis !== void 0) ? globalThis.${value.value} : undefined;\n`
@@ -412,14 +495,14 @@ module.exports = function parse (statements, tmp, isReturn) {
                 result += value;
                 break;
             case 'function_call':
-                if (value.type == 'identifier') {
-                    result += parse(value);
+                if (value.type == 'identifier' || value.type == 'keyword') {
+                    result += parse(value, tmp);
                 } else if (value.from && value.type != 'item_retraction') {
-                    result += `${parse(value.from)}.`
+                    result += `$get(${parse(value.from, tmp)}, `
                 }
                 if (value && value.value && value.value instanceof Array) {
                     if (value.type == 'array') {
-                        result += parse(value)
+                        result += parse(value, tmp)
                     } else {
                         for (let i = 0; i < value.value.length; i++) {
                             result += value.value[i].value
@@ -429,17 +512,17 @@ module.exports = function parse (statements, tmp, isReturn) {
                     }
                 }
                 else if (value.type == 'item_retraction') {
-                    result += parse(value)
+                    result += parse(value, tmp)
                 }
                 else if (typeof value === "object" && value.type != 'identifier') {
                     if (value.type === 'expression_with_parenthesis') {
-                        result += parse(value);
+                        result += parse(value, tmp);
                     } else if (value.type == 'function_call') {
-                        result += parse(value);
+                        result += parse(value, tmp);
                     } else if (value.value.type != 'identifier') {
-                        result += parse(value.value);
+                        result += parse(value.value, tmp);
                     } else {
-                        result += value.value.value;
+                        result += `"${value.value.value}")`;
                     }
                 }
                 else if (typeof value === "object") {
@@ -468,26 +551,14 @@ module.exports = function parse (statements, tmp, isReturn) {
                     result += '()';
                     break;
                 }
-                // result += parse([statement.arguments]);
-                    result += '(';
-                    var args = [];
-                    for (let i = 0; i < statement.arguments.value.length; i++) {
-                        args.push(parse(statement.arguments.value[i]));
-                    }
-                    result += args.join(',');
-                    // result += `(${value.map(i => parse(i)).join(',')})`;
+                result += '(';
+                var args = [];
+                for (let i = 0; i < statement.arguments.value.length; i++) {
+                    args.push(parse(statement.arguments.value[i]));
+                }
+                result += args.join(',');
                 result += ')';
                 break;
-            // case 'arguments':
-                    // result += '(';
-                    // let args = [];
-                    // for (let i = 0; i < value.length; i++) {
-                    //     args.push(parse([value[i]]));
-                    // }
-                    // result += args.join(',');
-                    // // result += `(${value.map(i => parse(i)).join(',')})`;
-                    // result += ')';
-                // break;
             case 'if_else':
                 result += `if (${parse(statement.if.condition)}) {${parse(statement.if.value, tmp)}}`;
                 result += ` else {${parse(statement.else.value, tmp)}}`;
@@ -507,13 +578,17 @@ module.exports = function parse (statements, tmp, isReturn) {
                 break;
             case 'for_loop':
                 if (!statement.from) {
+                    //result += `for (${statement.identifier.value}; ${parse(statement.condition)}; ${parse(statement.change)}) {${parse(value)}}`
                     result += `for (${parse(statement.identifier).replace(';', '')}; ${parse(statement.condition)}; ${parse(statement.change)}) {${parse(value)}}`
                     break;
                 }
                 var value0 = parse(statement.from);
                 var value1 = parse(statement.through);
+                var iterator = Math.random().toString(16).substr(2, 8);
                 if (!/^\d+$/.test(value0) || !/^\d+$/.test(value1)) {
-                    result += `for (let ${parse(statement.identifier)} of range(${value0}, ${value1}, ${statement.include})) {${parse(value, tmp)}}`
+                    result += `for (let _i${iterator} of range(${value0}, ${value1}, ${statement.include})) {
+                        ${parse(value, tmp, null, '', `$${lvl+1}.set("${statement.identifier.value}", _i${iterator}, true);`)}
+                    }`
                     break;
                 }
                 var min = Math.min(value0, value1);
@@ -527,13 +602,16 @@ module.exports = function parse (statements, tmp, isReturn) {
                 }
                 break;
             case 'for_in':
-                result += `for (let ${parse(statement.identifier)} in ${parse(statement.iterable)}) {${parse(value, tmp)}}`
+                var iterator = Math.random().toString(16).substr(2, 8);
+                result += `for (let _i${iterator} in ${parse(statement.iterable)}) {
+                    ${parse(value, tmp, null, '', `$${lvl+1}.set("${statement.identifier.value}", _i${iterator}, true);`)}
+                }`
                 break;
             case 'for_of':
-                result += `for (let ${parse(statement.identifier)} of ${parse(statement.iterable)}) {${parse(value, tmp)}}`
-                break;
-            case 'sleep':
-                result += `sleep(${value});`;
+                var iterator = Math.random().toString(16).substr(2, 8);
+                result += `for (let _i${iterator} of ${parse(statement.iterable)}) {
+                    ${parse(value, tmp, null, '', `$${lvl+1}.set("${statement.identifier.value}", _i${iterator}, true);`)}
+                }`
                 break;
             case 'case':
                 result += `case ${parse(value)}:`;
@@ -577,13 +655,55 @@ module.exports = function parse (statements, tmp, isReturn) {
             case 'expression':
                 result += `${parse(value[0])} ${value[1].value} ${parse(value[2])}`;
                 break;
+            case 'expression_short_equation': {
+                let v = parse(value[0], 'realValue');
+                if (value[0].type == 'identifier') {
+                    if (value[1].value == '+') {
+                        result += `$${lvl}.set("${value[0].value}", $add(${v}, ${parse(value[2])}))`;
+                        break;
+                    }
+                    result += `$${lvl}.set("${value[0].value}", ${v} ${value[1].value} ${parse(value[2])})`;
+                    break;
+                }
+                let parentesis = false;
+                let type = value[0].type;
+                if (type == 'item_retraction' || type == 'dot_retraction_v2') {
+                    parentesis = true;
+                    let prop = '';
+                    if (value[0].value && (value[0].value.type == 'identifier' || value[0].value.type == 'keyword')) {
+                        prop = `"${value[0].value.value}"`;
+                    } else {
+                        prop = parse(value[0].value, 'realValue');
+                    }
+                    result += `$update(${parse(value[0].from, 'realValue')}, ${prop}, `
+                    if (value[1].value == '+') {
+                        result += `$add(${v}, ${parse(value[2])}))`;
+                        break;
+                    }
+                    result += `${v} ${value[1].value} ${parse(value[2])})`
+                    break
+                } else if (type == 'item_retraction_last') {
+                    let val = parse(value[0].from, 'realValue');
+                    result += `$update(${val}, BS.last(${val}.length), `;
+                    if (value[1].value == '+') {
+                        result += `$add(${v}, ${parse(value[2])}))`;
+                        break;
+                    }
+                    result += `${v} ${value[1].value} ${parse(value[2])})`
+                }
+                if (value[1].value == '+') {
+                    result += `${v} = $add(${v}, ${parse(value[2])})`;
+                    break;
+                }
+                result += `${v} = ${v} ${value[1].value} ${parse(value[2])}`;
+                break;
+            }
             case 'expression_with_parenthesis':
                 if (!statement.arguments) {
                     result += `(${parse(value)})`;
                     break;
                 }
                 if (value.result) {
-                    // statement.type = 'annonymous_function';
                     result += `(${parse(value)})`;
                     if (statement.call_arguments || statement.arguments) {
                         let args = statement.call_arguments || statement.arguments;
@@ -600,6 +720,25 @@ module.exports = function parse (statements, tmp, isReturn) {
             case 'regexp':
                 result += value;
                 break;
+            case 'sum':
+                if (typeof value == 'number') {
+                    result += value;
+                    break;
+                }
+                if (statement.operator == '+') {
+                    result += `$add(${parse(statement.left)}, ${parse(statement.right)})`;
+                    break;
+                }
+                result += `${parse(statement.left)} ${statement.operator} ${parse(statement.right)}`;
+                break;
+            case 'product':
+            case 'pow':
+                if (typeof value == 'number') {
+                    result += value;
+                    break;
+                }
+                result += `${parse(statement.left)} ${statement.operator} ${parse(statement.right)}`;
+                break;
             case 'operator':
                 debugger
                 result += value;
@@ -632,7 +771,7 @@ module.exports = function parse (statements, tmp, isReturn) {
                     }
                     result += value;
                 } else {
-                    result += parse(value, tmp);
+                    result += parse(value, tmp, null, caller);
                 }
                 break;
             case 'throw':
@@ -656,7 +795,21 @@ module.exports = function parse (statements, tmp, isReturn) {
                 result += `eval(BS.parse(BS.ast(${parse(value)})));`;
                 break;
             case 'item_retraction':
-                result += `${parse(statement.from)}[${parse(value)}]`;
+                if (tmp == 'delete') {
+                    let v = parse(value, tmp);
+                    let from = null;
+                    if (statement.from.type == 'identifier') {
+                        from = `"${statement.from.value}"`;
+                    } else {
+                        from = parse(statement.from);
+                    }
+                    if (v[0] == '"' || v[0] == "'" || v[0] == '`') {
+                        v = v.slice(1, -1);
+                    }
+                    result += `$${lvl}.set(${from}, $delete(${parse(statement.from)}, "${v}"));`;
+                } else {
+                    result += `$get(${parse(statement.from, tmp)}, ${parse(value, tmp)})`;
+                }
                 if (statement.arguments) {
                     var r = [];
                     for (let i = 0; i < statement.arguments.value.length; i++) {
@@ -771,7 +924,7 @@ module.exports = function parse (statements, tmp, isReturn) {
                 // }
                 break;
             case 'object':
-                var output = '({';
+                var output = 'BS.Object({';
                 for (let i in value) {
                     // if (value[i].type == 'identifier' && value[i].value == 'inherit') {
                     //     output += `${i}:(function (self) {return self["${i}"]})(this),`;
@@ -789,7 +942,7 @@ module.exports = function parse (statements, tmp, isReturn) {
                 result += output;
                 break;
             case 'keyword':
-                result += value;
+                result += `$${lvl}.get("${value}")`;
                 break;
             case 'class_declaration':
                 result += `class ${parse(statement.identifier)} {
@@ -832,39 +985,24 @@ module.exports = function parse (statements, tmp, isReturn) {
                 var sav = statement.identifiers || [];
                 var values = statement.values;
                 var cancelables = statement.cancelables;
+                var args = [];
                 if (statement.types.length == 0) return '';
 
                 for (let i = 0; i < sav.length; i++) {
-                    r.push(`${parse(sav[i], tmp)}${values[i] ? '=' + parse(values[i], tmp) : ''}`);
+                    r.push(`${sav[i].value}${values[i] ? '=' + parse(values[i], tmp) : ''}`);
+                    //r.push(`${parse(sav[i], tmp)}${values[i] ? '=' + parse(values[i], tmp) : ''}`);
                     if (statement.types[i] !== 'none' && statement.types[i] !== null) {
                         let type = statement.types[i];
-                        let chk = `BS.checkArgType("${type}", "${sav[i].value}", ${statement.line}, ${statement.col});`;
+                        let v = values[i] !== null && values[i] !== void 0 ? parse(values[i]) : `arguments[${i}] ?? null`;
+                        let chk = `BS.checkArgType("${type}", "${sav[i].value}", ${v}, ${statement.line}, ${statement.col})`;
+
                         if (cancelables[i]) chk += `&& ${parse(sav[i])} !== null`;
+                        chk += ';';
                         types.push(chk);
-                        // types.push([statement.types[i], sav[i]]);
-                        // switch (type) {
-                        //     case 'int':
-                        //         types.push(`if (parseInt(${parse(sav[i])}) !== ${parse(sav[i])}) {
-                        //                 throw new TypeError('"${parse(sav[i])}" should be type of int')
-                        //             }`);
-                        //         break;
-                        //     case 'string':
-                        //         types.push(`if (typeof ${parse(sav[i])} !== 'string') {
-                        //                 throw new TypeError('"${parse(sav[i])}" should be type of string')
-                        //             }`);
-                        //         break;
-                        // }
                     }
+                    args.push(`$${lvl+1}.set("${sav[i].value}", ${sav[i].value});`)
                 }
-                // result += `(${r.join(', ')})`;
-                return [r.join(', '), types.length ? types.join('') : '']
-                // result += `(${r.join(', ')}) {
-                //     ${types.length ? types.join('') : ''}
-                //     ${parse(statement.value, statement.text)}
-                // }`;
-                // result += `constructor (${parse(statement.arguments)}) {
-                // }`
-                break;
+                return [r.join(', '), types.length ? types.join('') : '', args.join('')]
             case 'try':
                 result += `try {${parse(statement.value)}}`
                 break;
@@ -886,6 +1024,9 @@ module.exports = function parse (statements, tmp, isReturn) {
             case 'period':
                 result += `.`
                 break;
+            case 'test':
+                result += `console.log(eval('(function () {${parse(value)}})()') == ${parse(statement.expect)})`
+                break;
             case undefined: // whitespace
                 break;
             default:
diff --git a/lib/compiler/built_in.js b/lib/compiler/built_in/js/built_in.js
similarity index 67%
rename from lib/compiler/built_in.js
rename to lib/compiler/built_in/js/built_in.js
index 14565b7..433602b 100644
--- a/lib/compiler/built_in.js
+++ b/lib/compiler/built_in/js/built_in.js
@@ -1,23 +1,12 @@
-class Variable {
-    constructor(name, type, value) {
-        this.name = name;
-        this.type = type;
-        this.value = value;
-    }
-    set valueOf(value) {
-        if (this.type == 'let' || this.type == '\\') return this.value;
-        if (BS.getType(value) != this.type) {
-            throw new TypeError(`Assignment of a different type to variable "${this.name}" rather than "${this.type}" is prohibited.`)
-        }
-        this.value = value;
-    }
-    get valueOf () {
-        return this.value;
-    }
+// polifill for Array.prototype.isArray
+if (!Array.isArray) {
+    Array.isArray = function(arg) {
+        return Object.prototype.toString.call(arg) === '[object Array]';
+    };
 }
 globalThis.BS = {
     var(name, type, value) {
-        if (BS.getType(value) !== type) throw new TypeError(`Variable "${name}" is required to be "${type}", got "${BS.getType(value)}" instead.`)
+        if (BS.getType(value) !== type) throw new TypeError(`Variable "${name}" is required to be "${type}", got "${BS.getType(value)}" instead.`);
         return new Variable(name, type, value);
     },
     setValue(name, oldValue, value) {
@@ -27,11 +16,6 @@ globalThis.BS = {
         }
         return value;
     },
-    ck(value) {
-        if (value !== void 0)
-            return value;
-        return null;
-    },
     through (value0, value1, line, col) {
         if (typeof value0 != 'number' || typeof value1 != 'number') {
             throw new TypeError(`Number is expected on the line ${line}, col ${col}.`);
@@ -138,7 +122,7 @@ globalThis.BS = {
             return typeof value === 'object' && value !== null;
         },
     },
-    checkArgType(type, value, line, col) {
+    checkArgType(type, name, value, line, col) {
         if (type in this.customTypes) {
             let r = BS.customTypes[type];
             if (r && r(value))
@@ -149,7 +133,7 @@ globalThis.BS = {
             if (r && r(value))
                 return true;
         }
-        throw new TypeError(`Argument "${value}" is not type of "${type}" at line ${line}, col ${col}.`);
+        throw new TypeError(`Argument "${name}" is not type of "${type}" at line ${line}, col ${col}.`);
     },
     convert(value, type, outerType) {
         let t = this.getType(value);
@@ -175,7 +159,7 @@ globalThis.BS = {
                     if (t == 'undefined') return 'undefined';
                     else return value.toString();
                 case 'Array':
-                    if (t == 'undefined' || 'null') return []
+                    if (t == 'undefined' || t == 'null') return [];
                     if (t == 'html') return Object.values(this.DOMtoJSON(value));
                     if (t == 'object') return Object.values(value);
                     if (t == 'string') {
@@ -233,13 +217,13 @@ globalThis.BS = {
                                 //debugger
                                 //span.className += ' array';
                                 //span.innerText = JSON.stringify(value[i], null, 2);
-                                span.append('[')
-                                span.append(gt(value[i], type, 'Array'))
-                                span.append(']')
+                                span.append('[');
+                                span.append(gt(value[i], type, 'Array'));
+                                span.append(']');
                             } else if (ty == 'Object') {
                                 //span.innerText = JSON.stringify(value[i], null, 2);
                                 //let innerSpan = gt(value[i], type)
-                                span.append(gt(value[i], type))
+                                span.append(gt(value[i], type));
                             }
                             else span.innerText = `${value[i]}`;
                             span.className += ` ${ty}`;
@@ -296,7 +280,7 @@ globalThis.BS = {
             return Object.keys(object).length;
         //else return 0
         if (object === void 0 || object === null) {
-            return 0
+            return 0;
             //throw new TypeError('Cannot convert undefined or null to object');
         }
         return Object.keys(object).length;
@@ -320,48 +304,58 @@ globalThis.BS = {
         return 0;
     },
     storage: [],
-    // require('./ast_to_js.js')// || function () {console.warn('@eval is not supported yet in browsers.')}
+    defineProperty(prototype, propertyName, valueCallback, options) {
+        options = options || {
+            writable: true,
+            enumerable: false,
+            configurable: true
+        };
+        options.value = valueCallback;
+        Object.defineProperty(prototype, propertyName, options);
+    },
+    Object(object) {
+        //let o = Object.create(null);
+        //return Object.assign(o, object);
+        return object;
+    },
+    Array(array) {
+        if (array instanceof Array === false) array = BS.convert(array, 'Array');
+        let o = Object.create(null);
+        let proto = ['push', 'pop', 'shift', 'unshift', 'slice', 'splice',
+            'join', 'sort', 'map', 'forEach', 'indexOf', 'at', 'includes'];
+        for (let i in proto) {
+            BS.defineProperty(o, proto[i], function () {
+                return Array.prototype[proto[i]].apply(this, arguments);
+            });
+        }
+        array.__proto__ = o;
+        return array;
+    },
+    // require('./ast_to_js.js')//
+    //|| function () { console.warn('@eval is not supported yet in browsers.') }
 };
+
 const BS = globalThis.BS;
 
 const TypedArray = Reflect.getPrototypeOf(Int8Array);
 for (const C of [Array, String, TypedArray]) {
-    Object.defineProperty(C.prototype, "at", {
-        value: function at(n) {
-            // ToInteger() abstract op
-            n = Math.trunc(n) || 0;
-            // Allow negative indexing from the end
-            if (n < 0) n += this.length;
-            // OOB access is guaranteed to return undefined
-            if (n < 0 || n >= this.length) return undefined;
-            // Otherwise, this is just normal property access
-            return this[n];
-        },
-        writable: true,
-        enumerable: false,
-        configurable: true
+    BS.defineProperty(C.prototype, "at", function at(n) {
+        // ToInteger() abstract op
+        n = Math.trunc(n) || 0;
+        // Allow negative indexing from the end
+        if (n < 0) n += this.length;
+        // OOB access is guaranteed to return undefined
+        if (n < 0 || n >= this.length) return undefined;
+        // Otherwise, this is just normal property access
+        return this[n];
     });
-    Object.defineProperty(C.prototype, "last", {
-        value: function last() {
-            return this[this.length-1];
-        },
-        writable: true,
-        enumerable: false,
-        configurable: true
+    BS.defineProperty(C.prototype, "last", function last() {
+        return this[this.length-1];
     });
 }
-Object.defineProperty(String.prototype, "noBreaks", {
-    value: function noBreaks() {
-        return this.replace(/\r\n?/g, '');
-    },
-    writable: true,
-    enumerable: false,
-    configurable: true
+BS.defineProperty(String.prototype, "noBreaks", function noBreaks() {
+    return this.replace(/\r\n?/g, '');
 });
-// ! causes issues in for in loop
-//Array.prototype.last = function () {
-//    return this[this.length - 1];
-//};
 function list (amount, callback) {
     let array = [];
     for (let i = 0; i < amount; i++) {
@@ -374,68 +368,7 @@ function list (amount, callback) {
     }
     return array;
 }
-function range(start, stop, include = false){
-    if (stop === undefined) {
-        stop = start;
-        start = 0;
-    }
-    if (include) {
-        if (start > stop) {
-            stop--;
-        } else {
-            stop++
-        }
-    }
-    let i = start; // start
-    return { // iterator protocol
-        [Symbol.iterator]:() => { // @@iterator
-            return { // object with the next function
-                next () {
-                    while(i !== stop){
-                        let temp = i;
-                        if (start > stop) i--;
-                        else i++;
-                        return {
-                            value: temp,
-                            done: false,
-                        }
-                    }
-                    return {done: true}
-                }
-            }
-        }
-    }
-}
-const PI = 3.141592653589793,
-    E = 2.718281828459045,
-    log = (...args) => console.log(...args),
-    sqrt = Math.sqrt.bind(Math),
-    Time = {
-        get now () {
-            return Date.now()
-        },
-        get ms () {
-            return new Date().getMilliseconds()
-        },
-        get seconds () {
-            return new Date().getSeconds()
-        },
-        get minutes () {
-            return new Date().getMinutes()
-        },
-        get hours () {
-            return new Date().getHours()
-        },
-        get day () {
-            return new Date().getDay()
-        },
-        get month () {
-            return new Date().getMonth()
-        },
-        get year () {
-            return new Date().getFullYear()
-        },
-    },
+const log = (...args) => console.log(...args),
     sizeof = function sizeof (object) {
         if (object === void 0 || object === null) {
             throw new TypeError('Cannot convert undefined or null to object');
@@ -445,3 +378,135 @@ const PI = 3.141592653589793,
         }
         return Object.keys(object).length;
     };
+function clear_function_value(v) {
+    if (typeof v !== 'function') return v;
+    let r = Object.create(null);
+    r.name = v.name;
+    r.value = v.value.toString();
+    r.type = 'function';
+    return r;
+}
+function get_clear_value(v) {
+    if (typeof v != 'object' || v === null || v.constructor == 'Date') {
+        return v;
+        //return clear_function_value(v);
+    }
+    let r = Object.create(null);
+    if (BS.getType(v) == 'Array') {
+        r = BS.Array([]);
+    }
+    for (let i in v) {
+        if (v[i] instanceof Variable) {
+            if (v[i].name == 'this') continue;
+            //if (typeof v[i].value == 'function') {
+            //    r[`function ${i}`] = clear_function_value(v[i]);
+            //}
+            else r[i] = v[i].value;
+        }
+        else if (BS.getType(v[i]) == 'Object' && v[i].constructor == 'Date') {
+            r[i] = get_clear_value(v[i]);
+        }
+        else {
+            r[i] = v[i];
+        }
+    }
+    return r;
+}
+function $get(object, property, unclearValue) {
+    if (object === null || object === void 0) {
+        throw new TypeError(`Cannot read properties of "null"`);
+    }
+    let v = object[property];
+    if (v !== void 0) {
+        if (v instanceof Variable) {
+            return v.value;
+        }
+        if (BS.getType(v) == 'Object') {
+            if (unclearValue) return v;
+            return get_clear_value(v);
+        }
+        return v;
+    }
+    return null;
+}
+function $free(object, scope) {
+    if (scope) {
+        if (!object) {
+            throw new TypeError(`Attempt to delete non-existing variable`);
+        }
+        scope.delete(object);
+        return;
+    }
+}
+
+function $delete(object, property) {
+    if (object === null || object === void 0) {
+        throw new TypeError(`Cannot read or delete properties of "null"`);
+    }
+    let type = BS.getType(object);
+    if (type != 'Array' && type != 'Object') {
+        throw new TypeError(`Attempt to change immutable objects"`);
+    }
+    if (type == 'Array' || type == 'String') {
+        if (isNaN(parseInt(property))) {
+            return object;
+        }
+        //if (type == 'String') {
+        //    return object.slice(0, parseInt(property)) + object.slice(parseInt(property) + 1)
+        //}
+        try {
+            object.splice(property, 1);
+        } finally {
+            return object;
+        }
+    }
+    delete object[property];
+    return object;
+}
+function $return(localScope, globalScope, value) {
+    $clearScope(localScope, globalScope);
+    return value;
+}
+function $clearScope(localScope, globalScope) {
+    localScope.scopes.pop();
+    globalScope.scopes.pop();
+}
+
+function $add(value1, value2) {
+    if (Array.isArray(value1) && Array.isArray(value2)) {
+        return [].concat(value1, value2);
+    }
+    if (Array.isArray(value1)) {
+        return [].concat(value1, value2)
+    }
+    if (BS.getType(value1) == 'Object' && BS.getType(value2) == 'Object') {
+        return Object.assign({}, value1, value2);
+    }
+    if (value1 === null || value2 === null) {
+        throw  new TypeError('"null" cannot be used as in math expressions');
+    }
+    if (typeof value1 === 'string') {
+        if (typeof value2 !== 'string') {
+            throw new TypeError('String was expected for concatination, got "'+BS.getType(value2)+'" insetead');
+        }
+        return value1 + value2;
+    }
+    if (typeof value1 === 'number') {
+        if (typeof value2 !== 'number') {
+            throw new TypeError('Number was expected for math expression, got "'+BS.getType(value2)+'" insetead');
+        }
+        return value1 + value2;
+    }
+    return value1 + value2;
+}
+
+function $update(obj, property, value) {
+    if (!property in obj) {
+        throw new Error(`Property "${property}" is not found`);
+    }
+    return obj[property] = value;
+}
+
+function $new(value) {
+    return new value;
+}
\ No newline at end of file
diff --git a/lib/compiler/built_in/js/scope.js b/lib/compiler/built_in/js/scope.js
new file mode 100644
index 0000000..abb185c
--- /dev/null
+++ b/lib/compiler/built_in/js/scope.js
@@ -0,0 +1,189 @@
+const range = function range(start, stop, include = false) {
+    if (stop === undefined) {
+        stop = start;
+        start = 0;
+    }
+    if (include) {
+        if (start > stop) {
+            stop--;
+        } else {
+            stop++;
+        }
+    }
+    let i = start; // start
+    return { // iterator protocol
+        [Symbol.iterator]: () => { // @@iterator
+            return { // object with the next function
+                next() {
+                    while (i !== stop) {
+                        let temp = i;
+                        if (start > stop) i--;
+                        else i++;
+                        return {
+                            value: temp,
+                            done: false,
+                        }
+                    }
+                    return { done: true };
+                }
+            }
+        }
+    }
+};
+const isNaN = function isNaN(number) {
+    return typeof number == 'number' && number !== number;
+};
+
+const BUILT_IN_VALUES = {
+    Infinity: Infinity,
+    NaN: NaN,
+    range: range, // function
+    isNaN: isNaN, // function
+    empty: function empty(object) {
+        if (['array', 'string', 'object'].includes(typeof object)) {
+            return Object.keys(object).length == 0;
+        }
+        throw new TypeError(`Unexpected type of argument for "empty" function. "array", "string" or "object" was expected`)
+    },
+    round: function round(object) {
+        return Math.round(object)
+    },
+};
+class Variable {
+    constructor(name, type, value, constant = false, ignoreError = false) {
+        this.name = name;
+        this.type = type;
+        this.value = value === void 0 ? null : value;
+        this.constant = constant;
+        this.ignoreError = ignoreError;
+    }
+    set realValue(value) {
+        if (this.constant && !this.ignoreError) {
+            throw new Error(`Attempt to change value of constant "${this.name}"`)
+        } else if (this.constant) {
+            return this.value;
+        }
+        if (this.type == 'let' || this.type == '\\'
+            //|| this.type === null
+        ) return this.value;
+        if (this.type !== null && BS.getType(value) != this.type) {
+            throw new TypeError(`Assignment of a different type to variable "${this.name}" rather than "${this.type}" is prohibited`);
+        }
+        this.value = value;
+    }
+    get realValue () {
+        //return get_clear_value(this.value);
+        return this.value;
+    }
+    update(operator, value) {
+        this.value = eval('this.value' + operator + 'value');
+    }
+}
+
+class Scopes {
+    constructor() {
+        this.scopes = [];
+        this.globalScope = null;
+    }
+    new(level, parent = this) {
+        let scope = new Scope(level, parent);
+        parent.scopes.push(scope);
+        return scope;
+    }
+    global() {
+        let $0 = this.new(0);
+        $0.set('this', $0.variables, true, true, true);
+        $0.init(BUILT_IN_VALUES);
+        this.globalScope = $0;
+        //$0.init('Object', BS.Object.bind(BS);
+        //$0.init('Array', BS.Array.bind(BS);
+        return $0;
+    }
+    append_to_global(object) {
+        for (let i in object) {
+            this.globalScope.set(i, object[i], true, true);
+            BUILT_IN_VALUES[i] = object[i];
+        }
+    }
+}
+
+class Scope {
+    constructor(level, parent) {
+        this.level = level;
+        this.variables = {};
+        this.scopes = [];
+        this.parent = parent;
+    }
+    get(propertyName, unclearValue) {
+        if (this.variables[propertyName] !== void 0) {
+            if (unclearValue) return this.variables[propertyName].value;
+            return this.variables[propertyName].realValue;
+        }
+        let level = this.level;
+        if (level == 0 || !this.parent) {
+            console.warn(`Variable "${propertyName}" has never been declared. "null" is returned instead.`);
+            return null;
+            //throw ReferenceError(`Variable "${propertyName}" has never been declared.`)
+        }
+        return this.parent.get(propertyName);
+    }
+    getScope(propertyName) {
+        if (this.variables[propertyName]) {
+            return this;
+        }
+        let level = this.level;
+        if (level == 0 || !this.parent) return null;
+        return this.parent.getScope(propertyName);
+    }
+    init(values) {
+        for (let i in values) {
+            this.set(i, values[i], true, true);
+        }
+    }
+    set(propertyName, value, local = false, constant = false, ignoreError = false) {
+        if (local || constant) {
+            let v = this.variables[propertyName];
+            if (!v) {
+                this.variables[propertyName] = new Variable(propertyName, null, value, constant, ignoreError)
+            }
+            else {
+                this.variables[propertyName].realValue = value;
+            }
+            return null;
+        }
+        let scope = this.getScope(propertyName);
+        // not found
+        if (scope == null) {
+            scope = this;
+        }
+        let v = scope.variables[propertyName];
+        if (!v) {
+            scope.variables[propertyName] = new Variable(propertyName, null, value, constant);
+        }
+        else {
+            scope.variables[propertyName].realValue = value;
+        }
+        return null;
+    }
+    delete(propertyName) {
+        if (typeof propertyName != 'string') {
+            for (let i in this.variables) {
+                if (this.variables[i].value == propertyName) {
+                    delete this.variables[i];
+                    return true;
+                }
+            }
+        }
+        if (this.variables[propertyName]) {
+            delete this.variables[propertyName];
+            return true;
+        }
+        let level = this.level;
+        if (level == 0 || !this.parent) return false;
+        return this.parent.delete(propertyName);
+    }
+}
+
+const scopes = new Scopes();
+const $0 = scopes.global();
+
diff --git a/lib/compiler/built_in.php b/lib/compiler/built_in/php/built_in.php
similarity index 100%
rename from lib/compiler/built_in.php
rename to lib/compiler/built_in/php/built_in.php
diff --git a/lib/compiler/index.js b/lib/compiler/index.js
index d3dd6a1..1b11fd7 100644
--- a/lib/compiler/index.js
+++ b/lib/compiler/index.js
@@ -2,22 +2,17 @@ const fs = require('fs');
 const parser = require('./parser.js');
 function readFile (fileName) {
     let content = null;
-    // try {
-        content = fs.readFileSync(fileName, { encoding: "utf8", flag: "r" });
-    // } catch (err) {
-    //     throw err;
-    // }
+    content = fs.readFileSync(fileName, { encoding: "utf8", flag: "r" });
     return content;
 }
 module.exports = (string) => {
     // if string is provided
-    // console.log(1)
-    if (!/\.bs$/.test(string)) {
+    if (!/\.b(s|m)$/.test(string)) {
         try {
             let result = parser(string);
             return result;
         } catch (err) {
-            console.log(err)
+            console.warn(err)
             return;
         }
     }
@@ -27,6 +22,6 @@ module.exports = (string) => {
         let result = parser(file);
         return result;
     } catch (err) {
-        console.log(err)
+        console.warn(err)
     }
 }
\ No newline at end of file
diff --git a/lib/compiler/parser.js b/lib/compiler/parser.js
index 5f381bd..c71aece 100644
--- a/lib/compiler/parser.js
+++ b/lib/compiler/parser.js
@@ -1,19 +1,20 @@
-const nearley = require("nearley");
+// ! This file takes your input and returns language tokens
+const nearley = require("nearley")
 module.exports = function (str) {
-    const grammar = require('../grammar');
-    // const grammar = require("./basescript.js"); // keep here, otherwise if grammar is changed, watch needs to be restarted
-    const parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar));
-    // if (str.trim().length == 0) return '';
+    const grammar = require('../grammar')
+    // For dev purposes, keep this here.
+    // When your grammar updates, you will not need to restart.
+    const parser = new nearley.Parser(nearley.Grammar.fromCompiled(grammar))
     try {
-        let parsed = parser.feed(str);
-        // console.log(`Parsing result count: ${parsed.results.length}`)
-        // console.log(parsed.results);
+        let parsed = parser.feed(str)
         let result = parsed.results[0]
         if (!result) {
             console.log('[Log]: Grammar doesn\'t match.')
             return [];
         };
-        console.log('Results: ' + parsed.results.length)
+        if (parsed.results.length > 1) {
+            console.log('Results: ' + parsed.results.length)
+        }
         return result
     } catch (err) {
         try {
@@ -23,7 +24,7 @@ module.exports = function (str) {
                 console.error('[Parser]: Bad grammar')
                 let filtered = new Set(message
                     .slice(1)
-                    .map(i => i.split(/based on:\n/)[0].trim()));
+                    .map(i => i.split(/based on:\n/)[0].trim()))
                     console.error([message ? message[0] : '', [...filtered].join(', ')].join(''))
             } else {
                 console.error('[Parser]: Possible internal error')
@@ -31,9 +32,8 @@ module.exports = function (str) {
             }
         } catch (error) {
             console.error('[Parser]: Bad grammar')
-            console.error(error.message);
+            console.error(error.message)
         }
-        // debugger
     }
-    return [];
+    return []
 }
\ No newline at end of file
diff --git a/lib/grammar/grammar.js b/lib/grammar/grammar.js
index 7663de3..7ec2126 100644
--- a/lib/grammar/grammar.js
+++ b/lib/grammar/grammar.js
@@ -48,13 +48,39 @@ const lexer = moo.compile({
     // }
     ],
     //'@constructor': 'constructor',
-    keyword: ['Boolean', 'Number', 'String', 'Array', 'Object', 'unless', 'than', 'constructor', 'null', 'const', 'print', 'var', 'sizeof', 'Infinity', 'NaN', 'undefined', 'globalThis', 'through', 'THAT', 'DELETE', 'SAVE', 'LOG', 'ERROR', 'WRITE', 'INTO', 'PUSH', 'POP', 'SHIFT', 'UNSHIFT', 'FROM', 'Int', 'Float', 'BEGIN', 'END', 'SET', 'TO', 'typeof', 'instanceof', 'in', 'of', 'type', 'super', 'extends', 'function', 'def', 'this', 'echo', 'export', 'as', 'JSON', 'yield', 'async', 'try', 'catch', 'finally', 'static', 'while', 'if', 'else', 'import', 'from', 'let', 'const', 'null', 'of', 'default', 'caseof', 'switch', 'with', 'for', 'case', 'default', 'elif', 'debugger', 'or', 'and', 'return', 'new', 'is', 'not', 'throw', 'break', 'continue'].map(i => new RegExp(`\\b${i}\\b`)),
+    keyword: {
+        // reserved keywords and constants
+        match: ['void', 'constructor'
+            , 'null', 'this', 'globalThis', 'undefined', 'Infinity'
+            , 'THAT', 'DELETE'
+            , 'SAVE', 'INTO', 'PUSH', 'POP', 'SHIFT', 'UNSHIFT'
+            , 'FROM', 'BEGIN', 'END', 'instanceof', 'type'
+            , 'super', 'extends', 'function', 'def', 'echo'
+            , 'export', 'as', 'yield', 'async', 'try', 'catch', 'finally'
+            , 'static', 'import', 'from', 'of', 'default', 'caseof'
+            , 'switch', 'with', 'case', 'default', 'debugger'
+            , 'return', 'new', 'throw'].map(i => new RegExp(`\\b${i}\\b`)),
+        // Built in types or Converters
+        match: ['Boolean', 'Number', 'String', 'Array'
+            , 'Object', 'Function', 'Int', 'Float', 'JSON'//, 'NaN'
+        ].map(i => new RegExp(`\\b${i}\\b`)),
+        // if statement keywords
+        match: ['unless', 'than', 'if', 'else'
+            , 'elif', 'or', 'and', 'is', 'not'].map(i => new RegExp(`\\b${i}\\b`)),
+        // loop keywords
+        match: ['in', 'of', 'while', 'for'
+            , 'break', 'continue', 'through'].map(i => new RegExp(`\\b${i}\\b`)),
+        // variable related keywords
+        match: ['const', 'var', 'delete', 'free'
+            , 'SET', 'TO', 'print', 'LOG', 'ERROR'
+            , 'WRITE', 'sizeof', 'typeof'].map(i => new RegExp(`\\b${i}\\b`)),
+    },
     //regexp: /\/((?![*+?])(?:[^\r\n\[/\\]|\\.|\[(?:[^\r\n\]\\]|\\.)*\])+)\/((?:g(?:im?|mi?)?|i(?:gm?|mg?)?|m(?:gi?|ig?)?)?)/,
     regexp: /\/(?:\\[ ><bfnrtsSwWdD.+*^$[\]{}|?:\\]|[^><\n\/\\])*?\//,
-    operator: ['+', '-', '/', '**', '*', '%'],
+    operator: ['+', '-', '/', '**', '*', '%', '^'],
     // ! is not tested
-    bigInt: /(?:\+|-)?(?:[0-9]+(?:_?[0-9]+)*)n/,
-    number: /(?:\+|-)?(?:[0-9]+(?:_?[0-9]+)*)(?:\.[0-9]+)?/,
+    bigInt: /(?:[0-9]+(?:_?[0-9]+)*)n/,
+    number: /(?:[0-9]+(?:_?[0-9]+)*)(?:\.[0-9]+)?/,
     boolean: ['true', 'false'],
     // 'false': 'false',
     //'null': 'null',
@@ -310,7 +336,9 @@ const statement = {
         offset: v[0].offset,
     }),
     debugger: v => assign(v[0], {type: 'debugger'}),
-    delete: v => assign(v[0], {type: 'delete', value: v[2] }),
+    delete: v => assign(v[0], {type: 'delete', value: v[1] }),
+    free: v => assign(v[0], {type: 'free', value: v[1] }),
+    sleep: v => assign(v[0], {type: 'sleep', value: v[1] }),
     throw: v => assign(v[0], {
         type: 'throw',
         value: v[2]
@@ -500,7 +528,7 @@ function Null (v) {
     // debugger
     return assign(v[0], {
         type: 'null',
-        value: null
+        value: null,
     })
 }
 function boolean ([v]) {
@@ -519,6 +547,10 @@ const global = {};
 Object.join = function (obj) {
     return {...this, ...obj};
 }
+function debug(v) {
+    debugger;
+    return v;
+}
 var grammar = {
     Lexer: lexer,
     ParserRules: [
@@ -602,7 +634,8 @@ var grammar = {
     {"name": "statement", "symbols": ["class_declaration"], "postprocess": id},
     {"name": "statement", "symbols": ["with"], "postprocess": id},
     {"name": "statement", "symbols": [{"literal":"debugger"}], "postprocess": statement.debugger},
-    {"name": "statement", "symbols": [{"literal":"delete"}, "__", "value"], "postprocess": statement.delete},
+    {"name": "statement", "symbols": [{"literal":"delete"}, "arguments"], "postprocess": statement.delete},
+    {"name": "statement", "symbols": [{"literal":"free"}, "arguments"], "postprocess": statement.free},
     {"name": "statement", "symbols": ["return"], "postprocess": id},
     {"name": "statement", "symbols": [{"literal":"throw"}, "__", "value"], "postprocess": statement.throw},
     {"name": "statement$subexpression$1", "symbols": [{"literal":"break"}]},
@@ -620,13 +653,33 @@ var grammar = {
     {"name": "statements_block$ebnf$1$subexpression$1", "symbols": [{"literal":";"}, "_"]},
     {"name": "statements_block$ebnf$1", "symbols": ["statements_block$ebnf$1$subexpression$1"], "postprocess": id},
     {"name": "statements_block$ebnf$1", "symbols": [], "postprocess": function(d) {return null;}},
-    {"name": "statements_block", "symbols": ["_", {"literal":"{"}, "statements", "_", "statements_block$ebnf$1", {"literal":"}"}], "postprocess": v => v[2]},
+    {"name": "statements_block", "symbols": ["_", {"literal":"{"}, "statements", "_", "statements_block$ebnf$1", {"literal":"}"}], "postprocess":  v => ({
+            type: 'scope',
+            value: v[2],
+            line: v[2].line,
+            col: v[2].col
+        }) },
     {"name": "statements_block$ebnf$2$subexpression$1", "symbols": [{"literal":";"}, "_"]},
     {"name": "statements_block$ebnf$2", "symbols": ["statements_block$ebnf$2$subexpression$1"], "postprocess": id},
     {"name": "statements_block$ebnf$2", "symbols": [], "postprocess": function(d) {return null;}},
-    {"name": "statements_block", "symbols": ["_", {"literal":"BEGIN"}, "__", "statements", "_", "statements_block$ebnf$2", {"literal":"END"}], "postprocess": v => v[3]},
-    {"name": "statements_block", "symbols": ["_", {"literal":":"}, "_", "statement"], "postprocess": v => [v[3]]},
-    {"name": "statements_block", "symbols": ["_", {"literal":"do"}, "__", "statement"], "postprocess": v => [v[3]]},
+    {"name": "statements_block", "symbols": ["_", {"literal":"BEGIN"}, "__", "statements", "_", "statements_block$ebnf$2", {"literal":"END"}], "postprocess":  v => ({
+            type: 'scope',
+            value: v[3],
+            line: v[3].line,
+            col: v[3].colva
+        }) },
+    {"name": "statements_block", "symbols": ["_", {"literal":":"}, "_", "statement"], "postprocess":  v => ({
+            type: 'scope',
+            value: [v[3]],
+            line: v[3].line,
+            col: v[3].colva
+        }) },
+    {"name": "statements_block", "symbols": ["_", {"literal":"do"}, "__", "statement"], "postprocess":  v => ({
+            type: 'scope',
+            value: [v[3]],
+            line: v[3].line,
+            col: v[3].colva
+        }) },
     {"name": "type_declaration", "symbols": [{"literal":"type"}, "__", "identifier", "_", "arguments_with_types", "statements_block"], "postprocess":  v => {
         	if (v[2].value[0].toUpperCase() != v[2].value[0]) {
         		throw new SyntaxError(`Type name must be capitalized.`)
@@ -662,14 +715,16 @@ var grammar = {
             type: 'global',
         	value: v[3]
         }) },
-    {"name": "atom", "symbols": ["number"], "postprocess": id},
-    {"name": "atom", "symbols": ["string"], "postprocess": id},
-    {"name": "atom", "symbols": ["myNull"], "postprocess": id},
-    {"name": "atom", "symbols": [{"literal":"true"}], "postprocess": id},
-    {"name": "atom", "symbols": [{"literal":"false"}], "postprocess": id},
-    {"name": "atom", "symbols": ["parenthesized"], "postprocess": id},
-    {"name": "atom", "symbols": ["prefixExp"], "postprocess": id},
-    {"name": "identifier", "symbols": [(lexer.has("identifier") ? {type: "identifier"} : identifier)], "postprocess": id},
+    {"name": "identifier", "symbols": [(lexer.has("identifier") ? {type: "identifier"} : identifier)], "postprocess":  (v, l, reject) => {
+            if (v[0].type == 'null' ||
+                ['Infinity', 'this', 'globalThis', 'NaN'
+                , 'Boolean', 'Object', 'Array', 'String', 'Number', 'JSON'
+                ].includes(v[0].value)) {
+                return reject;
+            }
+            return v[0]
+        } },
+    {"name": "identifier", "symbols": ["allowed_keywords"], "postprocess": id},
     {"name": "allowed_keywords", "symbols": [{"literal":"Infinity"}], "postprocess": id},
     {"name": "allowed_keywords", "symbols": [{"literal":"this"}], "postprocess": id},
     {"name": "allowed_keywords", "symbols": [{"literal":"globalThis"}], "postprocess": id},
@@ -685,7 +740,9 @@ var grammar = {
             return {
                 type: 'convert',
                 value: v[0],
-                convert_type: v[4]
+                convert_type: v[4],
+                line: v[0].line,
+                col: v[0].col
             }
         } },
     {"name": "convert_type$subexpression$1", "symbols": [{"literal":"JSON"}]},
@@ -702,6 +759,7 @@ var grammar = {
     {"name": "pair$ebnf$1", "symbols": [], "postprocess": function(d) {return null;}},
     {"name": "pair", "symbols": ["pair$ebnf$1", "key", "_", "arguments_with_types", "statements_block"], "postprocess": object.es6_key_value},
     {"name": "pair", "symbols": ["key", "_", {"literal":":"}, "_", "value"], "postprocess": v => [v[0], v[4]]},
+    {"name": "pair", "symbols": ["key"], "postprocess": v => [v[0], v[0]]},
     {"name": "key", "symbols": ["string"], "postprocess": id},
     {"name": "key", "symbols": ["identifier"], "postprocess": id},
     {"name": "key", "symbols": [(lexer.has("keyword") ? {type: "keyword"} : keyword)], "postprocess": id},
@@ -711,7 +769,6 @@ var grammar = {
     {"name": "boolean$subexpression$1", "symbols": [(lexer.has("boolean") ? {type: "boolean"} : boolean)]},
     {"name": "boolean", "symbols": ["boolean$subexpression$1"], "postprocess": boolean},
     {"name": "string", "symbols": ["string_concat"], "postprocess": id},
-    {"name": "string", "symbols": ["number", {"literal":"px"}], "postprocess": string.px},
     {"name": "string", "symbols": [{"literal":"typeof"}, "_", {"literal":"("}, "_", "value", "_", {"literal":")"}], "postprocess":  v => ({
         	type: 'typeof',
         	value: v[4],
@@ -720,14 +777,6 @@ var grammar = {
         }) },
     {"name": "bigInt", "symbols": [(lexer.has("bigInt") ? {type: "bigInt"} : bigInt)], "postprocess": number.bigInt},
     {"name": "number", "symbols": [(lexer.has("number") ? {type: "number"} : number)], "postprocess": number.float},
-    {"name": "number$subexpression$1", "symbols": [{"literal":"-"}]},
-    {"name": "number", "symbols": ["number$subexpression$1", "_", "value"], "postprocess":  v => ({
-        	type: 'additive',
-        	sign: v[0][0].value,
-        	value: v[2],
-                line: v[0].line,
-                col: v[0].col
-        }) },
     {"name": "number", "symbols": [{"literal":"sizeof"}, "_", {"literal":"("}, "_", "value", "_", {"literal":")"}], "postprocess":  v => ({
         	type: 'sizeof',
         	value: v[4],
@@ -746,11 +795,16 @@ var grammar = {
     {"name": "regexp$ebnf$1$subexpression$1", "symbols": ["regexp_flags"]},
     {"name": "regexp$ebnf$1", "symbols": ["regexp$ebnf$1", "regexp$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
     {"name": "regexp", "symbols": [(lexer.has("regexp") ? {type: "regexp"} : regexp), "regexp$ebnf$1"], "postprocess": regexp.parse},
-    {"name": "Var", "symbols": ["identifier"], "postprocess": id},
-    {"name": "Var", "symbols": ["prefixExp", "_nbsp", {"literal":"["}, "_", {"literal":"]"}], "postprocess":  v => ({
+    {"name": "_base", "symbols": ["base"], "postprocess": id},
+    {"name": "_base", "symbols": ["array"], "postprocess": id},
+    {"name": "_base", "symbols": ["regexp"], "postprocess": id},
+    {"name": "_base", "symbols": ["object"], "postprocess": id},
+    {"name": "Var", "symbols": ["_base", "_nbsp", {"literal":"["}, "_", {"literal":"]"}], "postprocess":  v => ({
                 type: 'item_retraction_last',
                 //arguments: v[7] ? v[7][1] : null,
                 from: v[0],
+                line: v[0].line,
+                col: v[0].col
                 //value: v[4]
                 //identifier: v[0].value
         }) },
@@ -761,24 +815,29 @@ var grammar = {
     {"name": "Var$ebnf$2$subexpression$1", "symbols": ["_", {"literal":":"}, "_", "value"]},
     {"name": "Var$ebnf$2", "symbols": ["Var$ebnf$2$subexpression$1"], "postprocess": id},
     {"name": "Var$ebnf$2", "symbols": [], "postprocess": function(d) {return null;}},
-    {"name": "Var", "symbols": ["prefixExp", "_", {"literal":"["}, "Var$subexpression$1", "_", {"literal":":"}, "Var$ebnf$1", "Var$ebnf$2", "_", {"literal":"]"}], "postprocess": array.slice},
-    {"name": "Var", "symbols": ["prefixExp", "_nbsp", {"literal":"["}, "_", "value", "_", {"literal":"]"}], "postprocess":  v => ({
+    {"name": "Var", "symbols": ["_base", "_", {"literal":"["}, "Var$subexpression$1", "_", {"literal":":"}, "Var$ebnf$1", "Var$ebnf$2", "_", {"literal":"]"}], "postprocess": array.slice},
+    {"name": "Var", "symbols": ["_base", "_nbsp", {"literal":"["}, "_", "value", "_", {"literal":"]"}], "postprocess":  v => ({
                 type: 'item_retraction',
                 //arguments: v[7] ? v[7][1] : null,
                 from: v[0],
-                value: v[4]
+                value: v[4],
+                line: v[0].line,
+                col: v[0].col
                 //identifier: v[0].value
         }) },
     {"name": "Var$subexpression$2", "symbols": [(lexer.has("keyword") ? {type: "keyword"} : keyword)]},
     {"name": "Var$subexpression$2", "symbols": ["identifier"]},
-    {"name": "Var", "symbols": ["prefixExp", "_", {"literal":"."}, "_", "Var$subexpression$2"], "postprocess":  (v, l, reject) => {
+    {"name": "Var", "symbols": ["_base", "_", {"literal":"."}, "_", "Var$subexpression$2"], "postprocess":  (v, l, reject) => {
             if (v[0].type == 'annonymous_function') return reject
             return {
                 type: 'dot_retraction_v2',
                 from: v[0],
                 value: v[4][0],
+                line: v[0].line,
+                col: v[0].col
             }
         } },
+    {"name": "Var", "symbols": ["identifier"], "postprocess": id},
     {"name": "switch$ebnf$1", "symbols": []},
     {"name": "switch$ebnf$1$subexpression$1", "symbols": ["_", "case_single_valued"]},
     {"name": "switch$ebnf$1", "symbols": ["switch$ebnf$1", "switch$ebnf$1$subexpression$1"], "postprocess": function arrpush(d) {return d[0].concat([d[1]]);}},
@@ -841,14 +900,14 @@ var grammar = {
     {"name": "construct", "symbols": [{"literal":"constructor"}, "_", "arguments_with_types", "statements_block"], "postprocess": classes.construct},
     {"name": "es6_key_value", "symbols": ["identifier", "_", "arguments_with_types", "statements_block"], "postprocess": classes.es6_key_value},
     {"name": "if_block", "symbols": [{"literal":"if"}, "statement_condition", "statements_block"], "postprocess":  v => {
-        	return Object.assign(v[0], {
+        	return assign(v[0], {
         		type: 'if',
         		condition: v[1],
-        		value: v[2],
+        		value: v[2]
         	});
         } },
     {"name": "if_block", "symbols": [{"literal":"unless"}, "statement_condition", "statements_block"], "postprocess":  v => {
-        	return Object.assign(v[0], {
+        	return assign(v[0], {
         		type: 'if',
         		condition: v[1],
         		value: v[2],
@@ -953,8 +1012,10 @@ var grammar = {
                 col: v[0].col
         	})
         } },
+    {"name": "left_assign", "symbols": ["Var"], "postprocess": id},
+    {"name": "left_assign", "symbols": ["function_call"], "postprocess": id},
     {"name": "value_reassign$subexpression$1", "symbols": ["value"]},
-    {"name": "value_reassign", "symbols": ["prefixExp", "_", {"literal":"="}, "_", "value_reassign$subexpression$1"], "postprocess":  v => {
+    {"name": "value_reassign", "symbols": ["left_assign", "_", {"literal":"="}, "_", "value_reassign$subexpression$1"], "postprocess":  v => {
         	return {
         		type: 'var_reassign',
         		identifier: v[0],
@@ -976,6 +1037,7 @@ var grammar = {
         		offset: v[0].offset
         	}
         } },
+    {"name": "value_reassign", "symbols": ["value_addition"], "postprocess": id},
     {"name": "var_assign$subexpression$1", "symbols": [{"literal":"let"}, "__"]},
     {"name": "var_assign$subexpression$1", "symbols": [{"literal":"const"}, "__"]},
     {"name": "var_assign$subexpression$1", "symbols": [{"literal":"\\"}]},
@@ -992,7 +1054,9 @@ var grammar = {
         		value: {
         			type: 'var_assign_group',
         			identifier: v[6],
-        			value: [v[2][0]]
+        			value: [v[2][0]],
+                    line: v[2][0].line,
+                    col: v[2][0].col
         		},
         		offset: v[0].offset
         	}
@@ -1012,11 +1076,11 @@ var grammar = {
         	}
         } },
     {"name": "var_reassign", "symbols": ["identifier"], "postprocess":  v => ({
-        type: 'identifier',
-        value: v[0],
-                    line: v[0].line,
-                    col: v[0].col,
-            }) },
+            type: 'identifier',
+            value: v[0],
+            line: v[0].line,
+            col: v[0].col,
+        }) },
     {"name": "var_reassign$subexpression$1", "symbols": ["switch"]},
     {"name": "var_reassign$subexpression$1", "symbols": ["value"]},
     {"name": "var_reassign", "symbols": [{"literal":"SET"}, "_", "identifier", "_", {"literal":"TO"}, "_", "var_reassign$subexpression$1"], "postprocess":  v => {
@@ -1029,8 +1093,22 @@ var grammar = {
         		offset: v[0].offset
         	}
         } },
+    {"name": "value_addition$subexpression$1", "symbols": [{"literal":"+"}, {"literal":"="}]},
+    {"name": "value_addition$subexpression$1", "symbols": [{"literal":"-"}, {"literal":"="}]},
+    {"name": "value_addition$subexpression$1", "symbols": [{"literal":"*"}, {"literal":"="}]},
+    {"name": "value_addition$subexpression$1", "symbols": [{"literal":"/"}, {"literal":"="}]},
+    {"name": "value_addition", "symbols": ["prefixExp", "_nbsp", "value_addition$subexpression$1", "_", "sum"], "postprocess":  (v, l, reject) => {
+            if (v[0].type == 'string' || v[0].type == 'number' || v[0].type == 'boolean' || v[0].type == 'null') {
+                throw new Error(`Unexpected assignment at line ${v[2][0].line}, col ${v[2][0].col}`)
+            }
+            // console.log(v[4])
+            return ({
+                type: 'expression_short_equation',
+                value: [v[0], assign(v[2][0], {value: v[2][0].value}), v[4]]
+            })
+        } },
     {"name": "while_block", "symbols": [{"literal":"while"}, "statement_condition", "statements_block"], "postprocess":   v => {
-        	return Object.assign(v[0], {
+        	return assign(v[0], {
         		type: 'while',
         		condition: v[1],
         		value: v[2],
@@ -1039,7 +1117,7 @@ var grammar = {
     {"name": "for_block$subexpression$1", "symbols": [{"literal":"in"}]},
     {"name": "for_block$subexpression$1", "symbols": [{"literal":"of"}]},
     {"name": "for_block", "symbols": [{"literal":"for"}, "__", "identifier", "__", "for_block$subexpression$1", "__", "value", "statements_block"], "postprocess":   v => {
-        	return Object.assign(v[0], {
+        	return assign(v[0], {
         		type: 'for_' + v[4][0],
         		condition: v[1],
         		identifier: v[2],
@@ -1050,7 +1128,7 @@ var grammar = {
     {"name": "for_block$subexpression$2", "symbols": [{"literal":"in"}]},
     {"name": "for_block$subexpression$2", "symbols": [{"literal":"of"}]},
     {"name": "for_block", "symbols": [{"literal":"for"}, "_", {"literal":"("}, "_", "identifier", "__", "for_block$subexpression$2", "__", "value", "_", {"literal":")"}, "statements_block"], "postprocess":   v => {
-        	return Object.assign(v[0], {
+        	return assign(v[0], {
         		type: 'for_' + v[6][0],
         		//condition: v[4],
         		identifier: v[4],
@@ -1115,7 +1193,7 @@ var grammar = {
     {"name": "return", "symbols": [{"literal":"return"}, "__nbsp", "value"], "postprocess": returns.value},
     {"name": "return", "symbols": [{"literal":"return"}], "postprocess": returns.empty},
     {"name": "return", "symbols": [{"literal":"=>"}, "_nbsp", "value"], "postprocess": returns.value},
-    {"name": "function_call", "symbols": ["prefixExp", "_nbsp", "arguments"], "postprocess":  (v, l, reject) => {
+    {"name": "function_call", "symbols": ["_base", "_nbsp", "arguments"], "postprocess":  (v, l, reject) => {
             if (v[0].type == 'annonymous_function') return reject
         	return ({
         		type: 'function_call',
@@ -1147,7 +1225,7 @@ var grammar = {
         	argument_type: v[0] ? v[0][0] : 'none',
         	can_be_null: v[0] ? v[0][1] : false,
         	identifier: v[1],
-        	value: v[2] ? v[2][3] : undefined
+        	value: v[2] ? v[2][3] : null
         }) },
     {"name": "argument_type$ebnf$1$subexpression$1$subexpression$1", "symbols": [(lexer.has("keyword") ? {type: "keyword"} : keyword)]},
     {"name": "argument_type$ebnf$1$subexpression$1$subexpression$1", "symbols": ["identifier"]},
@@ -1164,6 +1242,7 @@ var grammar = {
             }
         	let n = v[0].value[0];
         	if (n.toUpperCase() != n) {
+                return;
         		throw new SyntaxError(`Argument type must be capitalized at line ${v[0].line}, col ${v[0].col}.`);
             }
         	return [v[0], v[1]];
@@ -1232,22 +1311,23 @@ var grammar = {
     {"name": "debugging", "symbols": ["debugging$subexpression$1", "debugging_body"], "postprocess":  v => ({
         	type: 'debugging',
         	method: 'log',
-        	value: v[1]
+        	value: v[1],
+            line: v[0].line,
+            col: v[0].col
         }) },
     {"name": "debugging", "symbols": [{"literal":"ERROR"}, "debugging_body"], "postprocess":  v => ({
         	type: 'debugging',
         	method: 'error',
-        	value: v[1]
-        }) },
-    {"name": "debugging", "symbols": [{"literal":"WRITE"}, "debugging_body"], "postprocess":  v => ({
-        	type: 'debugging',
-        	method: 'write',
-        	value: v[1]
+        	value: v[1],
+            line: v[0].line,
+            col: v[0].col
         }) },
     {"name": "debugging_body", "symbols": ["__", "value"], "postprocess": v => v[1]},
     {"name": "debugging_body", "symbols": ["_nbsp", "arguments"], "postprocess":  v => ({
             type: 'arguments',
-            value: v[1]
+            value: v[1],
+            line: v[1].line,
+            col: v[1].col
         }) },
     {"name": "html", "symbols": [{"literal":"#"}, {"literal":"{"}, "_", "value", "_", {"literal":"}"}], "postprocess": html.value_to_string},
     {"name": "html$ebnf$1", "symbols": []},
@@ -1323,63 +1403,119 @@ var grammar = {
         	line: v[0].line,
         	col: v[0].col
         }) },
-    {"name": "expression$subexpression$1", "symbols": [{"literal":"+"}, {"literal":"="}]},
-    {"name": "expression$subexpression$1", "symbols": [{"literal":"-"}, {"literal":"="}]},
-    {"name": "expression$subexpression$1", "symbols": [{"literal":"*"}, {"literal":"="}]},
-    {"name": "expression$subexpression$1", "symbols": [{"literal":"/"}, {"literal":"="}]},
-    {"name": "expression", "symbols": ["expression", "_nbsp", "expression$subexpression$1", "_", "prefixExp"], "postprocess":  (v, l, reject) => {
-            //if (v[0].type == 'annonymous_function') return reject;
-            return ({
-                type: 'expression',
-                value: [v[0], assign(v[2][0], {value: v[2][0].value+'='}), v[4]]
-            })
-        } },
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"**"}]},
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"*"}]},
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"+"}]},
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"-"}]},
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"/"}]},
-    {"name": "expression$subexpression$2", "symbols": [{"literal":"%"}]},
-    {"name": "expression", "symbols": ["expression", "_nbsp", "expression$subexpression$2", "_", "prefixExp"], "postprocess":  (v, l, reject) => {
-            if (v[0].type == 'annonymous_function') return reject;
-            return ({
-                type: 'expression',
-                value: [v[0], v[2][0], v[4]]
-            })
-        } },
+    {"name": "base", "symbols": ["parenthesized"], "postprocess": id},
+    {"name": "base", "symbols": ["Var"], "postprocess": id},
+    {"name": "base", "symbols": ["function_call"], "postprocess": id},
+    {"name": "base", "symbols": ["string"], "postprocess": id},
+    {"name": "base", "symbols": ["bigInt"], "postprocess": id},
+    {"name": "base", "symbols": ["number"], "postprocess": id},
+    {"name": "base", "symbols": ["convert"], "postprocess": id},
+    {"name": "sum$subexpression$1", "symbols": [{"literal":"+"}]},
+    {"name": "sum$subexpression$1", "symbols": [{"literal":"-"}]},
+    {"name": "sum", "symbols": ["sum", "_nbsp", "sum$subexpression$1", "_", "product"], "postprocess":  v => ({
+            type: 'sum',
+            left: v[0],
+            right: v[4],
+            operator: v[2][0].value,
+            value: (function (v) {
+                if (v[0].type == 'number' && v[4].type == 'number') {
+                    if (v[2][0].value == '+') {
+                        return v[0].value + v[4].value
+                    } else {
+                        return v[0].value - v[4].value
+                    }
+                } else {
+                    return null
+                }
+            })(v),
+            line: v[0].line,
+            col: v[0].col
+        }) },
+    {"name": "sum", "symbols": ["product"], "postprocess": id},
+    {"name": "product$subexpression$1", "symbols": [{"literal":"*"}]},
+    {"name": "product$subexpression$1", "symbols": [{"literal":"/"}]},
+    {"name": "product", "symbols": ["product", "_nbsp", "product$subexpression$1", "_", "unary"], "postprocess":  v => ({
+            type: 'product',
+            left: v[0],
+            right: v[4],
+            operator: v[2][0].value,
+            value: (function (v) {
+                if (v[0].type == 'number' && v[4].type == 'number') {
+                    if (v[2][0].value == '*') {
+                        return v[0].value * v[4].value
+                    } else {
+                        return v[0].value / v[4].value
+                    }
+                } else {
+                    return null
+                }
+            })(v),
+            line: v[0].line,
+            col: v[0].col
+        }) },
+    {"name": "product", "symbols": ["unary"], "postprocess": id},
+    {"name": "unary", "symbols": [{"literal":"-"}, "_nbsp", "unary"], "postprocess":  v => {
+            return {
+            type: 'number_negative',
+            value: v[2],
+            line: v[0].line,
+            col: v[0].col
+        }} },
+    {"name": "unary", "symbols": ["pow"], "postprocess": id},
+    {"name": "pow$subexpression$1", "symbols": [{"literal":"**"}]},
+    {"name": "pow$subexpression$1", "symbols": [{"literal":"%"}]},
+    {"name": "pow", "symbols": ["pow", "_nbsp", "pow$subexpression$1", "_", "unary"], "postprocess":  v => ({
+            type: 'pow',
+            left: v[0],
+            right: v[4],
+            operator: v[2][0].value,
+            value: (function (v) {
+                if (v[0].type == 'number' && v[4].type == 'number') {
+                    if (v[2][0].value == '**') {
+                        return v[0].value ** v[4].value
+                    } else {
+                        return v[0].value % v[4].value
+                    }
+                } else {
+                    return null
+                }
+            })(v),
+            line: v[0].line,
+            col: v[0].col
+        }) },
+    {"name": "pow", "symbols": ["base"], "postprocess": id},
     {"name": "expression", "symbols": ["prefixExp"], "postprocess": id},
-    {"name": "expression", "symbols": ["convert"], "postprocess": id},
     {"name": "value", "symbols": ["condition"], "postprocess": id},
     {"name": "_value", "symbols": ["expression"], "postprocess": id},
     {"name": "_value", "symbols": [{"literal":"!"}, "_", "prefixExp"], "postprocess":  v => {
-            return {type: 'boolean_reversed', value: v[2] }
-        } },
-    {"name": "_value$subexpression$1", "symbols": [{"literal":"new"}]},
-    {"name": "_value$subexpression$1", "symbols": [{"literal":"await"}]},
-    {"name": "_value$subexpression$1", "symbols": [{"literal":"yield"}]},
-    {"name": "_value", "symbols": ["_value$subexpression$1", "__", "prefixExp"], "postprocess":  v => {
-        	return assign(v[0][0], {
-        		type: v[0][0].text,
-        		value: v[2]
-        	})
+            return {
+                type: 'boolean_reversed',
+                value: v[2],
+                line: v[0].line,
+                col: v[0].col
+            }
         } },
     {"name": "_value", "symbols": ["prefixExp", "__", {"literal":"instanceof"}, "__", "prefixExp"], "postprocess":  v => ({
         	type: 'instanceof',
         	left: v[0],
-        	value: v[4]
+        	value: v[4],
+                line: v[0].line,
+                col: v[0].col
         }) },
     {"name": "_value", "symbols": ["myNull"], "postprocess": id},
     {"name": "_value", "symbols": ["ternary"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["parenthesized"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["Var"], "postprocess": id},
+    {"name": "_value", "symbols": [{"literal":"private"}, "statements_block"], "postprocess":  v => {
+            return {
+                type: 'private',
+                value: v[1],
+                line: v[0].line,
+                col: v[0].col
+            }
+        } },
+    {"name": "prefixExp", "symbols": ["sum"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["annonymous_function"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["function_call"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["regexp"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["allowed_keywords"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["array"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["string"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["bigInt"], "postprocess": id},
-    {"name": "prefixExp", "symbols": ["number"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["object"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["boolean"], "postprocess": id},
     {"name": "prefixExp", "symbols": ["html"], "postprocess":  (v, l, reject) => {
@@ -1392,7 +1528,9 @@ var grammar = {
             //if (v[2].type == 'convert') return reject;
             return {
                 type: 'expression_with_parenthesis',
-                value: v[2]
+                value: v[2],
+                line: v[0].line,
+                col: v[0].col
             }
         } },
     {"name": "_$ebnf$1", "symbols": []},
diff --git a/lib/grammar/lexer/footer.js b/lib/grammar/lexer/footer.js
index f84d5e3..7b151e4 100644
--- a/lib/grammar/lexer/footer.js
+++ b/lib/grammar/lexer/footer.js
@@ -193,7 +193,9 @@ const statement = {
         offset: v[0].offset,
     }),
     debugger: v => assign(v[0], {type: 'debugger'}),
-    delete: v => assign(v[0], {type: 'delete', value: v[2] }),
+    delete: v => assign(v[0], {type: 'delete', value: v[1] }),
+    free: v => assign(v[0], {type: 'free', value: v[1] }),
+    sleep: v => assign(v[0], {type: 'sleep', value: v[1] }),
     throw: v => assign(v[0], {
         type: 'throw',
         value: v[2]
@@ -383,7 +385,7 @@ function Null (v) {
     // debugger
     return assign(v[0], {
         type: 'null',
-        value: null
+        value: null,
     })
 }
 function boolean ([v]) {
@@ -401,4 +403,8 @@ function extractPair (kv, output) {
 const global = {};
 Object.join = function (obj) {
     return {...this, ...obj};
+}
+function debug(v) {
+    debugger;
+    return v;
 }
\ No newline at end of file
diff --git a/lib/grammar/lexer/lexer.js b/lib/grammar/lexer/lexer.js
index 13ae3a1..0ee68fc 100644
--- a/lib/grammar/lexer/lexer.js
+++ b/lib/grammar/lexer/lexer.js
@@ -38,13 +38,39 @@ const lexer = moo.compile({
     // }
     ],
     //'@constructor': 'constructor',
-    keyword: ['Boolean', 'Number', 'String', 'Array', 'Object', 'unless', 'than', 'constructor', 'null', 'const', 'print', 'var', 'sizeof', 'Infinity', 'NaN', 'undefined', 'globalThis', 'through', 'THAT', 'DELETE', 'SAVE', 'LOG', 'ERROR', 'WRITE', 'INTO', 'PUSH', 'POP', 'SHIFT', 'UNSHIFT', 'FROM', 'Int', 'Float', 'BEGIN', 'END', 'SET', 'TO', 'typeof', 'instanceof', 'in', 'of', 'type', 'super', 'extends', 'function', 'def', 'this', 'echo', 'export', 'as', 'JSON', 'yield', 'async', 'try', 'catch', 'finally', 'static', 'while', 'if', 'else', 'import', 'from', 'let', 'const', 'null', 'of', 'default', 'caseof', 'switch', 'with', 'for', 'case', 'default', 'elif', 'debugger', 'or', 'and', 'return', 'new', 'is', 'not', 'throw', 'break', 'continue'].map(i => new RegExp(`\\b${i}\\b`)),
+    keyword: {
+        // reserved keywords and constants
+        match: ['void', 'constructor'
+            , 'null', 'this', 'globalThis', 'undefined', 'Infinity'
+            , 'THAT', 'DELETE'
+            , 'SAVE', 'INTO', 'PUSH', 'POP', 'SHIFT', 'UNSHIFT'
+            , 'FROM', 'BEGIN', 'END', 'instanceof', 'type'
+            , 'super', 'extends', 'function', 'def', 'echo'
+            , 'export', 'as', 'yield', 'async', 'try', 'catch', 'finally'
+            , 'static', 'import', 'from', 'of', 'default', 'caseof'
+            , 'switch', 'with', 'case', 'default', 'debugger'
+            , 'return', 'new', 'throw'].map(i => new RegExp(`\\b${i}\\b`)),
+        // Built in types or Converters
+        match: ['Boolean', 'Number', 'String', 'Array'
+            , 'Object', 'Function', 'Int', 'Float', 'JSON'//, 'NaN'
+        ].map(i => new RegExp(`\\b${i}\\b`)),
+        // if statement keywords
+        match: ['unless', 'than', 'if', 'else'
+            , 'elif', 'or', 'and', 'is', 'not'].map(i => new RegExp(`\\b${i}\\b`)),
+        // loop keywords
+        match: ['in', 'of', 'while', 'for'
+            , 'break', 'continue', 'through'].map(i => new RegExp(`\\b${i}\\b`)),
+        // variable related keywords
+        match: ['const', 'var', 'delete', 'free'
+            , 'SET', 'TO', 'print', 'LOG', 'ERROR'
+            , 'WRITE', 'sizeof', 'typeof'].map(i => new RegExp(`\\b${i}\\b`)),
+    },
     //regexp: /\/((?![*+?])(?:[^\r\n\[/\\]|\\.|\[(?:[^\r\n\]\\]|\\.)*\])+)\/((?:g(?:im?|mi?)?|i(?:gm?|mg?)?|m(?:gi?|ig?)?)?)/,
     regexp: /\/(?:\\[ ><bfnrtsSwWdD.+*^$[\]{}|?:\\]|[^><\n\/\\])*?\//,
-    operator: ['+', '-', '/', '**', '*', '%'],
+    operator: ['+', '-', '/', '**', '*', '%', '^'],
     // ! is not tested
-    bigInt: /(?:\+|-)?(?:[0-9]+(?:_?[0-9]+)*)n/,
-    number: /(?:\+|-)?(?:[0-9]+(?:_?[0-9]+)*)(?:\.[0-9]+)?/,
+    bigInt: /(?:[0-9]+(?:_?[0-9]+)*)n/,
+    number: /(?:[0-9]+(?:_?[0-9]+)*)(?:\.[0-9]+)?/,
     boolean: ['true', 'false'],
     // 'false': 'false',
     //'null': 'null',
diff --git a/lib/grammar/ne/debugging.ne b/lib/grammar/ne/debugging.ne
index 525ed43..ac2ec0b 100644
--- a/lib/grammar/ne/debugging.ne
+++ b/lib/grammar/ne/debugging.ne
@@ -1,20 +1,28 @@
 debugging -> ("LOG" | "print") debugging_body {% v => ({
 	type: 'debugging',
 	method: 'log',
-	value: v[1]
+	value: v[1],
+    line: v[0].line,
+    col: v[0].col
 }) %}
 | "ERROR" debugging_body {% v => ({
 	type: 'debugging',
 	method: 'error',
-	value: v[1]
-}) %}
-| "WRITE" debugging_body {% v => ({
-	type: 'debugging',
-	method: 'write',
-	value: v[1]
+	value: v[1],
+    line: v[0].line,
+    col: v[0].col
 }) %}
+#| "WRITE" debugging_body {% v => ({
+#	type: 'debugging',
+#	method: 'write',
+#	value: v[1],
+#    line: v[0].line,
+#    col: v[0].col
+#}) %}
 debugging_body -> __ value {% v => v[1] %}
     | _nbsp arguments {% v => ({
         type: 'arguments',
-        value: v[1]
+        value: v[1],
+        line: v[1].line,
+        col: v[1].col
     }) %}
\ No newline at end of file
diff --git a/lib/grammar/ne/functions.ne b/lib/grammar/ne/functions.ne
index 0b9a869..8b9d1da 100644
--- a/lib/grammar/ne/functions.ne
+++ b/lib/grammar/ne/functions.ne
@@ -16,15 +16,12 @@ annonymous_function ->
     #        async: v[0] ? true : false
     #    }
     #} %}
-	#| iife {% id %}
-
-#iife -> "(" _ annonymous_function _ ")" _ arguments {% functions.iife %}
 
 return -> "return" __nbsp value {% returns.value %}
     | "return" {% returns.empty %}
     | "=>" _nbsp value {% returns.value %}
 
-function_call -> prefixExp _nbsp arguments {% (v, l, reject) => {
+function_call -> _base _nbsp arguments {% (v, l, reject) => {
     if (v[0].type == 'annonymous_function') return reject
 	return ({
 		type: 'function_call',
@@ -45,7 +42,7 @@ argument_identifier_and_value -> argument_type identifier (_ "=" _ value):? {% v
 	argument_type: v[0] ? v[0][0] : 'none',
 	can_be_null: v[0] ? v[0][1] : false,
 	identifier: v[1],
-	value: v[2] ? v[2][3] : undefined
+	value: v[2] ? v[2][3] : null
 }) %}
 
 argument_type -> ((%keyword | identifier) "?":? __):? {% v => {
@@ -56,6 +53,7 @@ argument_type -> ((%keyword | identifier) "?":? __):? {% v => {
     }
 	let n = v[0].value[0];
 	if (n.toUpperCase() != n) {
+        return;
 		throw new SyntaxError(`Argument type must be capitalized at line ${v[0].line}, col ${v[0].col}.`);
     }
 	return [v[0], v[1]];
diff --git a/lib/grammar/ne/if_else.ne b/lib/grammar/ne/if_else.ne
index 090422b..587a810 100644
--- a/lib/grammar/ne/if_else.ne
+++ b/lib/grammar/ne/if_else.ne
@@ -1,13 +1,13 @@
 # if else
 if_block -> "if" statement_condition statements_block {% v => {
-	return Object.assign(v[0], {
+	return assign(v[0], {
 		type: 'if',
 		condition: v[1],
-		value: v[2],
+		value: v[2]
 	});
 } %}
     | "unless" statement_condition statements_block {% v => {
-	return Object.assign(v[0], {
+	return assign(v[0], {
 		type: 'if',
 		condition: v[1],
 		value: v[2],
diff --git a/lib/grammar/ne/loops.ne b/lib/grammar/ne/loops.ne
index 487fc8a..ec1bd2c 100644
--- a/lib/grammar/ne/loops.ne
+++ b/lib/grammar/ne/loops.ne
@@ -1,13 +1,13 @@
 # loops
 while_block -> "while" statement_condition statements_block {%  v => {
-	return Object.assign(v[0], {
+	return assign(v[0], {
 		type: 'while',
 		condition: v[1],
 		value: v[2],
 	});
 } %}
 for_block -> "for" __ identifier __ ("in" | "of") __ value statements_block {%  v => {
-	return Object.assign(v[0], {
+	return assign(v[0], {
 		type: 'for_' + v[4][0],
 		condition: v[1],
 		identifier: v[2],
@@ -16,7 +16,7 @@ for_block -> "for" __ identifier __ ("in" | "of") __ value statements_block {%
 	});
 } %}
 for_block -> "for" _ "(" _ identifier __ ("in" | "of") __ value _ ")" statements_block {%  v => {
-	return Object.assign(v[0], {
+	return assign(v[0], {
 		type: 'for_' + v[6][0],
 		//condition: v[4],
 		identifier: v[4],
diff --git a/lib/grammar/ne/main.ne b/lib/grammar/ne/main.ne
index c48a414..6866e23 100644
--- a/lib/grammar/ne/main.ne
+++ b/lib/grammar/ne/main.ne
@@ -80,7 +80,10 @@ statement -> blocks {% id %}
 	#| "DELETE" __ "THAT" EOL {% v => ({
 	#	type: 'DELETE',
 	#}) %}
-	| "delete" __ value {% statement.delete %}
+	#| "delete" __ value {% statement.delete %}
+    | "delete" arguments {% statement.delete %}
+    | "free" arguments {% statement.free %}
+    #| "sleep" arguments {% statement.sleep %}
 	| return {% id %}
 	| "throw" __ value {% statement.throw %}
 	| ("break" | "continue") {% statement.break_continue %}
@@ -90,6 +93,7 @@ statement -> blocks {% id %}
 	#| "@include" __ string EOL {% statement.include %}
 	| var_assign {% id %}
 	| value_reassign {% statement.value_reassign %}
+    #| value_addition {% statement.value_addition %}
 	| value {% statement.value %}
 
 blocks ->
@@ -102,11 +106,37 @@ blocks ->
 	| for_block {% id %}
 	| try_catch_finally {% id %}
 	| switch_multiple {% id %}
+    #| "test" statements_block _ "expect" _ value {% v => ({
+    #    type: 'test',
+    #    value: v[1],
+    #    expect: v[5]
+    #}) %}
 
-statements_block -> _ "{" statements _ (";" _):? "}" {% v => v[2] %}
-	| _ "BEGIN" __ statements _ (";" _):? "END" {% v => v[3] %}
-	| _ ":" _ statement {% v => [v[3]] %}
-	| _ "do" __ statement {% v => [v[3]] %}
+statements_block -> _ "{" statements _ (";" _):? "}" {% v => ({
+    type: 'scope',
+    value: v[2],
+    line: v[2].line,
+    col: v[2].col
+}) %}
+	| _ "BEGIN" __ statements _ (";" _):? "END" {% v => ({
+    type: 'scope',
+    value: v[3],
+    line: v[3].line,
+    col: v[3].colva
+}) %}
+	| _ ":" _ statement {% v => ({
+        type: 'scope',
+        value: [v[3]],
+        line: v[3].line,
+        col: v[3].colva
+    }) %}
+    #{% v => [v[3]] %}
+	| _ "do" __ statement {% v => ({
+        type: 'scope',
+        value: [v[3]],
+        line: v[3].line,
+        col: v[3].colva
+    }) %}
 ### END statements ###
 
 type_declaration -> "type" __ identifier _ arguments_with_types statements_block {% v => {
diff --git a/lib/grammar/ne/primitives.ne b/lib/grammar/ne/primitives.ne
index 0e09051..2e2fa3a 100644
--- a/lib/grammar/ne/primitives.ne
+++ b/lib/grammar/ne/primitives.ne
@@ -1,14 +1,23 @@
-atom -> number {% id %}
-    | string {% id %}
-    | myNull {% id %}
-    | "true" {% id %}
-    | "false" {% id %}
-    | parenthesized {% id %}
-    | prefixExp {% id %}
-    # ! function definition is missing
+#atom -> number {% id %}
+#    | string {% id %}
+#    | myNull {% id %}
+#    | "true" {% id %}
+#    | "false" {% id %}
+#    | parenthesized {% id %}
+#    | prefixExp {% id %}
+#    # ! function definition is missing
 
 # base line
-identifier -> %identifier {% id %}
+identifier -> %identifier {% (v, l, reject) => {
+    if (v[0].type == 'null' ||
+        ['Infinity', 'this', 'globalThis', 'NaN'
+        , 'Boolean', 'Object', 'Array', 'String', 'Number', 'JSON'
+        ].includes(v[0].value)) {
+        return reject;
+    }
+    return v[0]
+} %}
+    | allowed_keywords {% id %}
 
 allowed_keywords ->
     "Infinity" {% id %}
@@ -21,13 +30,17 @@ allowed_keywords ->
     | "String" {% id %}
     | "Number" {% id %}
     | "JSON" {% id %}
+    #| "null" {% id %}
+    #| myNull {% id %}
 
 convert -> prefixExp __ "as" __ convert_type {% (v, l, reject) => {
     //if (v[0] && !v[6] || !v[0] && v[6]) return reject
     return {
         type: 'convert',
         value: v[0],
-        convert_type: v[4]
+        convert_type: v[4],
+        line: v[0].line,
+        col: v[0].col
     }
 } %}
 
@@ -49,6 +62,7 @@ convert_type -> ("JSON" | "String" | "Number" | "Boolean" | "Object" | "Float" |
 # objects
 pair -> ("async" __):? key _ arguments_with_types statements_block {% object.es6_key_value %}
 	| key _ ":" _ value {% v => [v[0], v[4]] %}
+    | key {% v => [v[0], v[0]] %}
 
 key -> string {% id %}
 	| identifier {% id %}
@@ -73,7 +87,7 @@ boolean -> (%boolean) {% boolean %}
 # strings
 string -> string_concat {% id %}
 	# | string _ "[" _ number _ ":" ":":? _ number _ "]" {% string.slice %}
-	| number "px" {% string.px %}
+	#| number "px" {% string.px %}
     #| "typeof" __ prefixExp {% v => {
     #    return {
     #        type: 'typeof',
@@ -94,13 +108,13 @@ string -> string_concat {% id %}
 bigInt -> %bigInt {% number.bigInt %}
 
 number -> %number {% number.float %}
-	| ("-") _ value {% v => ({
-		type: 'additive',
-		sign: v[0][0].value,
-		value: v[2],
-        line: v[0].line,
-        col: v[0].col
-	}) %}
+	#| ("-") _ value {% v => ({
+	#	type: 'additive',
+	#	sign: v[0][0].value,
+	#	value: v[2],
+    #    line: v[0].line,
+    #    col: v[0].col
+	#}) %}
     #| "sizeof" __ prefixExp {% v => ({
 	#	type: 'sizeof',
 	#	value: v[2],
diff --git a/lib/grammar/ne/retraction.ne b/lib/grammar/ne/retraction.ne
index 72537fa..4dc7cba 100644
--- a/lib/grammar/ne/retraction.ne
+++ b/lib/grammar/ne/retraction.ne
@@ -1,28 +1,41 @@
-Var -> identifier {% id %}
+_base -> base {% id %}
+    | array {% id %}
+	| regexp {% id %}
+    | object {% id %}
+
+Var ->
     # ! needs more tests, though works
-	| prefixExp _nbsp "[" _ "]" {% v => ({
+	_base _nbsp "[" _ "]" {% v => ({
         type: 'item_retraction_last',
         //arguments: v[7] ? v[7][1] : null,
         from: v[0],
+        line: v[0].line,
+        col: v[0].col
         //value: v[4]
         //identifier: v[0].value
 	}) %}
-	| prefixExp _ "[" (_ value) _ ":" (_ value):? (_ ":" _ value):? _ "]" {% array.slice %}
-	| prefixExp _nbsp "[" _ value _ "]" {% v => ({
+	| _base _ "[" (_ value) _ ":" (_ value):? (_ ":" _ value):? _ "]" {% array.slice %}
+	| _base _nbsp "[" _ value _ "]" {% v => ({
         type: 'item_retraction',
         //arguments: v[7] ? v[7][1] : null,
         from: v[0],
-        value: v[4]
+        value: v[4],
+        line: v[0].line,
+        col: v[0].col
         //identifier: v[0].value
 	}) %}
-	| prefixExp _ "." _ (%keyword | identifier) {% (v, l, reject) => {
+	|
+    _base _ "." _ (%keyword | identifier) {% (v, l, reject) => {
         if (v[0].type == 'annonymous_function') return reject
         return {
             type: 'dot_retraction_v2',
             from: v[0],
             value: v[4][0],
+            line: v[0].line,
+            col: v[0].col
         }
     } %}
+    | identifier {% id %}
 
 # ! removed all for now, code above already replaces this
 #object_retraction -> single_retraction (_ "." _ right_side_retraction {% v => v[3] %}):+ {% v => ({
diff --git a/lib/grammar/ne/value.ne b/lib/grammar/ne/value.ne
index 98cec3c..69a0156 100644
--- a/lib/grammar/ne/value.ne
+++ b/lib/grammar/ne/value.ne
@@ -1,20 +1,100 @@
 # expressions
+
+base -> parenthesized {% id %}
+	#| annonymous_function {% id %}
+	#| regexp {% id %}
+    | Var {% id %}
+	| function_call {% id %}
+    #| allowed_keywords {% id %}
+	| string {% id %}
+	| bigInt {% id %}
+	| number {% id %}
+	#| array {% id %}
+    | convert {% id %}
+	#| object {% id %}
+	#| boolean {% id %}
+
+sum -> sum _nbsp ("+" | "-") _ product {% v => ({
+    type: 'sum',
+    left: v[0],
+    right: v[4],
+    operator: v[2][0].value,
+    value: (function (v) {
+        if (v[0].type == 'number' && v[4].type == 'number') {
+            if (v[2][0].value == '+') {
+                return v[0].value + v[4].value
+            } else {
+                return v[0].value - v[4].value
+            }
+        } else {
+            return null
+        }
+    })(v),
+    line: v[0].line,
+    col: v[0].col
+}) %}
+    | product {% id %}
+
+product -> product _nbsp ("*" | "/") _ unary {% v => ({
+    type: 'product',
+    left: v[0],
+    right: v[4],
+    operator: v[2][0].value,
+    value: (function (v) {
+        if (v[0].type == 'number' && v[4].type == 'number') {
+            if (v[2][0].value == '*') {
+                return v[0].value * v[4].value
+            } else {
+                return v[0].value / v[4].value
+            }
+        } else {
+            return null
+        }
+    })(v),
+    line: v[0].line,
+    col: v[0].col
+}) %}
+    | unary {% id %}
+
+unary -> "-" _nbsp unary {% v => {
+    return {
+    type: 'number_negative',
+    value: v[2],
+    line: v[0].line,
+    col: v[0].col
+}} %}
+    | pow {% id %}
+
+pow -> pow _nbsp ("**" | "%") _ unary {% v => ({
+    type: 'pow',
+    left: v[0],
+    right: v[4],
+    operator: v[2][0].value,
+    value: (function (v) {
+        if (v[0].type == 'number' && v[4].type == 'number') {
+            if (v[2][0].value == '**') {
+                return v[0].value ** v[4].value
+            } else {
+                return v[0].value % v[4].value
+            }
+        } else {
+            return null
+        }
+    })(v),
+    line: v[0].line,
+    col: v[0].col
+}) %}
+    | base {% id %}
+
 expression ->
-    expression _nbsp ("+" "=" | "-" "=" | "*" "=" | "/" "=") _ prefixExp {% (v, l, reject) => {
-        //if (v[0].type == 'annonymous_function') return reject;
-        return ({
-            type: 'expression',
-            value: [v[0], assign(v[2][0], {value: v[2][0].value+'='}), v[4]]
-        })
-    } %}
-	| expression _nbsp ("**" | "*" | "+" | "-" | "/" | "%") _ prefixExp {% (v, l, reject) => {
-        if (v[0].type == 'annonymous_function') return reject;
-        return ({
-            type: 'expression',
-            value: [v[0], v[2][0], v[4]]
-        })
-    } %}
-    | prefixExp {% id %}
+	#| expression _nbsp ("**" | "*" | "+" | "-" | "/" | "%") _ prefixExp {% (v, l, reject) => {
+    #    if (v[0].type == 'annonymous_function') return reject;
+    #    return ({
+    #        type: 'expression',
+    #        value: [v[0], v[2][0], v[4]]
+    #    })
+    #} %}
+    prefixExp {% id %}
     # ! removed for now
 	#| "(" _ expression _ ")" (_ arguments):? {% v => ({
 	#	type: 'expression_with_parenthesis',
@@ -26,26 +106,33 @@ expression ->
 	#| array_interactions {% id %}
     # ! removed for now
 	#| "THAT" {% v => ({type: 'USE', line: v[0].line, col: v[0].col}) %}
-	| convert {% id %}
 
 value -> condition {% id %}
     #| _value {% id %}
 _value ->
 	expression {% id %}
-    | "!" _ prefixExp {% v => {
-        return {type: 'boolean_reversed', value: v[2] }
+    |
+    "!" _ prefixExp {% v => {
+        return {
+            type: 'boolean_reversed',
+            value: v[2],
+            line: v[0].line,
+            col: v[0].col
+        }
     } %}
-	| ("new" | "await" | "yield") __ prefixExp {% v => {
-		return assign(v[0][0], {
-			type: v[0][0].text,
-			value: v[2]
-		})
-	} %}
+	#| ("new" | "await" | "yield") __ prefixExp {% v => {
+	#	return assign(v[0][0], {
+	#		type: v[0][0].text,
+	#		value: v[2]
+	#	})
+	#} %}
 	#| "@text" __ value {% html.value_to_string %}
 	| prefixExp __ "instanceof" __ prefixExp {% v => ({
 		type: 'instanceof',
 		left: v[0],
-		value: v[4]
+		value: v[4],
+        line: v[0].line,
+        col: v[0].col
 	}) %}
 	# |
 	#| condition {% id %}
@@ -55,18 +142,28 @@ _value ->
 	# | ("this" | identifier | html | object | number | function_call) _ "." _ ("this" | identifier | html | object | number | function_call) {% v => v %}
 	| myNull {% id %}
     | ternary {% id %}
+    | "private" statements_block {% v => {
+        return {
+            type: 'private',
+            value: v[1],
+            line: v[0].line,
+            col: v[0].col
+        }
+    } %}
 	# | annonymous_function {% id %}
 
-prefixExp -> parenthesized {% id %}
-    | Var {% id %}
+prefixExp ->
+#parenthesized {% id %}
+    sum {% id %}
+    #| Var {% id %}
 	| annonymous_function {% id %}
-	| function_call {% id %}
+	#| function_call {% id %}
 	| regexp {% id %}
-    | allowed_keywords {% id %}
+    #| allowed_keywords {% id %}
 	| array {% id %}
-	| string {% id %}
-	| bigInt {% id %}
-	| number {% id %}
+	#| string {% id %}
+	#| bigInt {% id %}
+	#| number {% id %}
 	| object {% id %}
 	| boolean {% id %}
     #| "+" _ prefixExp {% v => ({
@@ -84,6 +181,8 @@ parenthesized -> "(" _ value _ ")" {% (v, l, reject) => {
     //if (v[2].type == 'convert') return reject;
     return {
         type: 'expression_with_parenthesis',
-        value: v[2]
+        value: v[2],
+        line: v[0].line,
+        col: v[0].col
     }
 } %}
diff --git a/lib/grammar/ne/variables.ne b/lib/grammar/ne/variables.ne
index 345cb28..db33da0 100644
--- a/lib/grammar/ne/variables.ne
+++ b/lib/grammar/ne/variables.ne
@@ -1,5 +1,7 @@
+left_assign -> Var {% id %}
+    | function_call {% id %}
 # value assignment
-value_reassign -> prefixExp _ "=" _ (value) {% v => {
+value_reassign -> left_assign _ "=" _ (value) {% v => {
 	return {
 		type: 'var_reassign',
 		identifier: v[0],
@@ -19,6 +21,7 @@ value_reassign -> prefixExp _ "=" _ (value) {% v => {
 		offset: v[0].offset
 	}
 } %}
+    | value_addition {% id %}
 
 var_assign -> ("let" __ | "const" __ | "\\") var_assign_list {% vars.assign %}
 	| "ASSIGN" _ (switch | value) _ "TO" _  identifier {% v => {
@@ -31,7 +34,9 @@ var_assign -> ("let" __ | "const" __ | "\\") var_assign_list {% vars.assign %}
 		value: {
 			type: 'var_assign_group',
 			identifier: v[6],
-			value: [v[2][0]]
+			value: [v[2][0]],
+            line: v[2][0].line,
+            col: v[2][0].col
 		},
 		offset: v[0].offset
 	}
@@ -50,10 +55,10 @@ var_reassign -> identifier _ "=" _ value {% v => {
 	}
 } %}
     | identifier {% v => ({
-			type: 'identifier',
-			value: v[0],
-            line: v[0].line,
-            col: v[0].col,
+        type: 'identifier',
+        value: v[0],
+        line: v[0].line,
+        col: v[0].col,
     }) %}
 	| "SET" _ identifier _ "TO" _ (switch | value) {% v => {
 	return {
@@ -65,3 +70,15 @@ var_reassign -> identifier _ "=" _ value {% v => {
 		offset: v[0].offset
 	}
 } %}
+
+value_addition ->
+    prefixExp _nbsp ("+" "=" | "-" "=" | "*" "=" | "/" "=") _ sum {% (v, l, reject) => {
+        if (v[0].type == 'string' || v[0].type == 'number' || v[0].type == 'boolean' || v[0].type == 'null') {
+            throw new Error(`Unexpected assignment at line ${v[2][0].line}, col ${v[2][0].col}`)
+        }
+        // console.log(v[4])
+        return ({
+            type: 'expression_short_equation',
+            value: [v[0], assign(v[2][0], {value: v[2][0].value}), v[4]]
+        })
+    } %}
\ No newline at end of file
diff --git a/package-lock.json b/package-lock.json
index ffe7ab6..9e33ff9 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,20 +1,90 @@
 {
-  "name": "basescript",
-  "version": "1.0.3",
+  "name": "basescript.js",
+  "version": "0.1.32",
   "lockfileVersion": 1,
   "requires": true,
   "dependencies": {
-    "@sindresorhus/is": {
-      "version": "0.14.0",
-      "resolved": "https://registry.npmjs.org/@sindresorhus/is/-/is-0.14.0.tgz",
-      "integrity": "sha512-9NET910DNaIPngYnLLPeg+Ogzqsi9uM4mSboU5y6p8S5DzMTVEsJZrawi+BoDNUVBa2DhJqQYUFvMDfgU062LQ=="
+    "@node-minify/core": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@node-minify/core/-/core-7.0.0.tgz",
+      "integrity": "sha512-0EKr4hOfXRgSFWaqcr7S+1H89/svJnYhFw3U2gWn01CxZraPLDbk/5bySi4QzEhzBWxEkq8cfsJa1gKiWbuV+Q==",
+      "requires": {
+        "@node-minify/utils": "^7.0.0",
+        "globby": "11.0.4",
+        "mkdirp": "1.0.4"
+      },
+      "dependencies": {
+        "mkdirp": {
+          "version": "1.0.4",
+          "resolved": "https://registry.npmjs.org/mkdirp/-/mkdirp-1.0.4.tgz",
+          "integrity": "sha512-vVqVZQyf3WLx2Shd0qJ9xuvqgAyKPLAiqITEtqW0oIUjzo3PePDd6fW9iFz30ef7Ysp/oiWqbhszeGWW2T6Gzw=="
+        }
+      }
     },
-    "@szmarczak/http-timer": {
-      "version": "1.1.2",
-      "resolved": "https://registry.npmjs.org/@szmarczak/http-timer/-/http-timer-1.1.2.tgz",
-      "integrity": "sha512-XIB2XbzHTN6ieIjfIMV9hlVcfPU26s2vafYWQcZHWXHOxiaRZYEDKEwdl129Zyg50+foYV2jCgtrqSA6qNuNSA==",
+    "@node-minify/google-closure-compiler": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@node-minify/google-closure-compiler/-/google-closure-compiler-7.0.0.tgz",
+      "integrity": "sha512-oMb0h1vBZhwYwaRb711Q0b00aFkGuZxymd10d3IYqFbH9vNwGwoa3FSjTUsQRcWUEbfpzDj9GAMfFn/iOkOsDw==",
+      "requires": {
+        "@node-minify/utils": "^7.0.0",
+        "google-closure-compiler-java": "20220719.0.0"
+      }
+    },
+    "@node-minify/uglify-js": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@node-minify/uglify-js/-/uglify-js-7.0.0.tgz",
+      "integrity": "sha512-oIBEN27NuxTFySCytgUiE9HK35OS9+A7crHJazVEIclvp1ZCzMB62vc7tjRmjUhZ4YdvJ1u9BPupT5VTQCV7Ww==",
+      "requires": {
+        "@node-minify/utils": "^7.0.0",
+        "uglify-js": "3.16.3"
+      },
+      "dependencies": {
+        "uglify-js": {
+          "version": "3.16.3",
+          "resolved": "https://registry.npmjs.org/uglify-js/-/uglify-js-3.16.3.tgz",
+          "integrity": "sha512-uVbFqx9vvLhQg0iBaau9Z75AxWJ8tqM9AV890dIZCLApF4rTcyHwmAvLeEdYRs+BzYWu8Iw81F79ah0EfTXbaw=="
+        }
+      }
+    },
+    "@node-minify/utils": {
+      "version": "7.0.0",
+      "resolved": "https://registry.npmjs.org/@node-minify/utils/-/utils-7.0.0.tgz",
+      "integrity": "sha512-Ujpl66BEB1TpinmVyT9PAsKhK3+/s2CcLqEx1kllbDp0ByaUIRVX30eEAPJ1xleW6yEQz502LghcJvRSrb2hEg==",
+      "requires": {
+        "gzip-size": "6.0.0"
+      },
+      "dependencies": {
+        "gzip-size": {
+          "version": "6.0.0",
+          "resolved": "https://registry.npmjs.org/gzip-size/-/gzip-size-6.0.0.tgz",
+          "integrity": "sha512-ax7ZYomf6jqPTQ4+XCpUGyXKHk5WweS+e05MBO4/y3WJ5RkmPXNKvX+bx1behVILVwr6JSQvZAku021CHPXG3Q==",
+          "requires": {
+            "duplexer": "^0.1.2"
+          }
+        }
+      }
+    },
+    "@nodelib/fs.scandir": {
+      "version": "2.1.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.scandir/-/fs.scandir-2.1.5.tgz",
+      "integrity": "sha512-vq24Bq3ym5HEQm2NKCr3yXDwjc7vTsEThRDnkp2DK9p1uqLR+DHurm/NOTo0KG7HYHU7eppKZj3MyqYuMBf62g==",
+      "requires": {
+        "@nodelib/fs.stat": "2.0.5",
+        "run-parallel": "^1.1.9"
+      }
+    },
+    "@nodelib/fs.stat": {
+      "version": "2.0.5",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.stat/-/fs.stat-2.0.5.tgz",
+      "integrity": "sha512-RkhPPp2zrqDAQA/2jNhnztcPAlv64XdhIp7a7454A5ovI7Bukxgt7MX7udwAu3zg1DcpPU0rz3VV1SeaqvY4+A=="
+    },
+    "@nodelib/fs.walk": {
+      "version": "1.2.8",
+      "resolved": "https://registry.npmjs.org/@nodelib/fs.walk/-/fs.walk-1.2.8.tgz",
+      "integrity": "sha512-oGB+UxlgWcgQkgwo8GcEGwemoTFt3FIO9ababBmaGwXIoBKZ+GTy0pP185beGg7Llih/NSHSV2XAs1lnznocSg==",
       "requires": {
-        "defer-to-connect": "^1.0.1"
+        "@nodelib/fs.scandir": "2.1.5",
+        "fastq": "^1.6.0"
       }
     },
     "abbrev": {
@@ -22,13 +92,10 @@
       "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
       "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q=="
     },
-    "ansi-align": {
-      "version": "3.0.1",
-      "resolved": "https://registry.npmjs.org/ansi-align/-/ansi-align-3.0.1.tgz",
-      "integrity": "sha512-IOfwwBF5iczOjp/WeY4YxyjqAFMQoZufdQWDd19SEExbVLNXqvpzSJ/M7Za4/sCPmQ0+GRquoA7bGcINcxew6w==",
-      "requires": {
-        "string-width": "^4.1.0"
-      }
+    "acorn": {
+      "version": "5.7.4",
+      "resolved": "https://registry.npmjs.org/acorn/-/acorn-5.7.4.tgz",
+      "integrity": "sha512-1D++VG7BhrtvQpNbBzovKNc1FLGGEE/oGe7b9xJm/RFHMBeUaUGpluV9RLjZa47YFdPcDAenEYuq9pQPcMdLJg=="
     },
     "ansi-regex": {
       "version": "5.0.1",
@@ -52,6 +119,430 @@
         "picomatch": "^2.0.4"
       }
     },
+    "argparse": {
+      "version": "1.0.10",
+      "resolved": "https://registry.npmjs.org/argparse/-/argparse-1.0.10.tgz",
+      "integrity": "sha512-o5Roy6tNG4SL/FOkCAN6RzjiakZS25RLYFrcMttJqbdd8BWrnA+fGz57iN5Pb06pvBGvl5gQ0B48dJlslXvoTg==",
+      "requires": {
+        "sprintf-js": "~1.0.2"
+      }
+    },
+    "array-union": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/array-union/-/array-union-2.1.0.tgz",
+      "integrity": "sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw=="
+    },
+    "babel-code-frame": {
+      "version": "6.26.0",
+      "resolved": "https://registry.npmjs.org/babel-code-frame/-/babel-code-frame-6.26.0.tgz",
+      "integrity": "sha512-XqYMR2dfdGMW+hd0IUZ2PwK+fGeFkOxZJ0wY+JaQAHzt1Zx8LcvpiZD2NiGkEG8qx0CfkAOr5xt76d1e8vG90g==",
+      "requires": {
+        "chalk": "^1.1.3",
+        "esutils": "^2.0.2",
+        "js-tokens": "^3.0.2"
+      },
+      "dependencies": {
+        "ansi-regex": {
+          "version": "2.1.1",
+          "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-2.1.1.tgz",
+          "integrity": "sha512-TIGnTpdo+E3+pCyAluZvtED5p5wCqLdezCyhPZzKPcxvFplEt4i+W7OONCKgeZFT3+y5NZZfOOS/Bdcanm1MYA=="
+        },
+        "ansi-styles": {
+          "version": "2.2.1",
+          "resolved": "https://registry.npmjs.org/ansi-styles/-/ansi-styles-2.2.1.tgz",
+          "integrity": "sha512-kmCevFghRiWM7HB5zTPULl4r9bVFSWjz62MhqizDGUrq2NWuNMQyuv4tHHoKJHs69M/MF64lEcHdYIocrdWQYA=="
+        },
+        "chalk": {
+          "version": "1.1.3",
+          "resolved": "https://registry.npmjs.org/chalk/-/chalk-1.1.3.tgz",
+          "integrity": "sha512-U3lRVLMSlsCfjqYPbLyVv11M9CPW4I728d6TCKMAOJueEeB9/8o+eSsMnxPJD+Q+K909sdESg7C+tIkoH6on1A==",
+          "requires": {
+            "ansi-styles": "^2.2.1",
+            "escape-string-regexp": "^1.0.2",
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-        "typedarray-to-buffer": "^3.1.5"
-      }
-    },
-    "xdg-basedir": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/xdg-basedir/-/xdg-basedir-4.0.0.tgz",
-      "integrity": "sha512-PSNhEJDejZYV7h50BohL09Er9VaIefr2LMAf3OEmpCkjOi34eYyQYAXUTjEQtZJTKcF0E2UKTh+osDLsgNim9Q=="
-    },
     "y18n": {
       "version": "5.0.8",
       "resolved": "https://registry.npmjs.org/y18n/-/y18n-5.0.8.tgz",
       "integrity": "sha512-0pfFzegeDWJHJIAmTLRP2DwHjdF5s7jo9tuztdQxAhINCdvS+3nGINqPd00AphqJR/0LhANUS6/+7SCb98YOfA=="
     },
-    "yallist": {
-      "version": "4.0.0",
-      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
-      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A=="
-    },
     "yargs": {
       "version": "17.3.1",
       "resolved": "https://registry.npmjs.org/yargs/-/yargs-17.3.1.tgz",
diff --git a/package.json b/package.json
index f7cfff8..0050885 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
     "name": "basescript.js",
-    "version": "0.1.21",
+    "version": "0.1.33",
     "description": "A scritpting language powered with Node.js and Nearley, that compiles down to JavaScript, and has the possibility for even more!",
     "main": "index.js",
     "watch": {
diff --git a/src/script/script.bs b/src/script/script.bs
index a60920a..bdfb167 100644
--- a/src/script/script.bs
+++ b/src/script/script.bs
@@ -1,2 +1,5 @@
-a = 10
-a.f()
\ No newline at end of file
+#include <Date>
+print Date.now
+print Date.year
+print Date.msInYear
+//print lastYear.now
\ No newline at end of file
diff --git a/src/script/script.js b/src/script/script.js
index 2208450..eed9b5f 100644
--- a/src/script/script.js
+++ b/src/script/script.js
@@ -1,454 +1,97 @@
-if (!globalThis) { globalThis = window || global || this || {}; } try { globalThis.require = require; } catch (err) { globalThis.require = () => undefined; } 
-                class Variable {
-    constructor(name, type, value) {
-        this.name = name;
-        this.type = type;
-        this.value = value;
-    }
-    set valueOf(value) {
-        if (this.type == 'let' || this.type == '\\') return this.value;
-        if (BS.getType(value) != this.type) {
-            throw new TypeError(`Assignment of a different type to variable "${this.name}" rather than "${this.type}" is prohibited.`)
-        }
-        this.value = value;
-    }
-    get valueOf () {
-        return this.value;
-    }
-}
-globalThis.BS = {
-    var(name, type, value) {
-        if (BS.getType(value) !== type) throw new TypeError(`Variable "${name}" is required to be "${type}", got "${BS.getType(value)}" instead.`)
-        return new Variable(name, type, value);
-    },
-    setValue(name, oldValue, value) {
-        if (oldValue instanceof Variable) {
-            oldValue.valueOf = value;
-            return oldValue;
-        }
-        return value;
-    },
-    ck(value) {
-        if (value !== void 0)
-            return value;
-        return null;
-    },
-    through (value0, value1, line, col) {
-        if (typeof value0 != 'number' || typeof value1 != 'number') {
-            throw new TypeError(`Number is expected on the line ${line}, col ${col}.`);
-        }
-        let output = [];
-        let min = Math.min(value0, value1);
-        let max = Math.max(value0, value1);
-        for (let i = min; i <= max; i++) {
-            output.push(i);
+if (!globalThis) { globalThis = window || global || this || {}; } try { globalThis.require = require; } catch (err) { globalThis.require = () => undefined; }  
+if (!Array.isArray) {Array.isArray=function(arg) {return Object.prototype.toString.call(arg)==='[object Array]';};} globalThis.BS={var(name, type, value) {if (BS.getType(value)!==type) throw new TypeError(`Variable "${name}" is required to be "${type}", got "${BS.getType(value)}" instead.`); return new Variable(name, type, value);}, setValue(name, oldValue, value) {if (oldValue instanceof Variable) {oldValue.valueOf=value; return oldValue;} return value;}, through (value0, value1, line, col) {if (typeof value0!='number'||typeof value1!='number') {throw new TypeError(`Number is expected on the line ${line}, col ${col}.`);} let output=[]; let min=Math.min(value0, value1); let max=Math.max(value0, value1); for (let i=min; i<=max; i++) {output.push(i);} if (value0!=min) output=output.reverse(); return output;}, delete (value, index) {Array.prototype.splice.call(value, index, 1); return value;}, slice (value, start, end, step=1, line, col) {if (!Array.isArray(value)&&typeof value!='string') {throw new TypeError(`Array or string was expected at line ${line}, col ${col}`);} if (typeof start!='number') {throw new TypeError(`Number was expected at line ${line}, col ${col}`);} if (end===null&&step===null) {return value.slice(start);} step=step|0; if (step>=0) step=1; else step=-1; let result=value.slice(start, end); if (step===-1) {if (typeof value==='string') return Array.from(result).reverse().join(''); return result.reverse();} return result;}, customTypes: {}, types: {Array (value) {return Array.isArray(value);}, Null (value) {return value===null;}, Undefined (value) {return value===void 0;}, Int (value) {return parseInt(value)===value&&!Number.isNaN(value);}, Float (value) {return typeof value==='number'&&!Number.isNaN(value);}, Number (value) {return typeof value==='number'&&!Number.isNaN(value);}, BigInt(value) {return typeof value==='bigint';}, NaN (value) {return Number.isNaN(value);}, String (value) {return typeof value==='string';}, Function (value) {return typeof value==='function';}, Symbol (value) {return typeof value==='symbol';}, Boolean (value) {return typeof value==='boolean';}, Object(value) {if (BS.types.HTML&&BS.types.HTML(value)) {return false;} return typeof value==='object'&&value!==null;},}, checkArgType(type, name, value, line, col) {if (type in this.customTypes) {let r=BS.customTypes[type]; if (r&&r(value)) return true;} if (type in this.types) {let r=BS.types[type]; if (r&&r(value)) return true;} throw new TypeError(`Argument "${name}" is not type of "${type}" at line ${line}, col ${col}.`);}, convert(value, type, outerType) {let t=this.getType(value); if (t) t=t.toLowerCase(); let tmp=null; if (typeof type!=='object'&&t==type.toLowerCase()) return value; let gt=function (value, type, outerType) {outerType=outerType||this.getType(value); switch (type) {case 'Number': case 'Float': tmp=parseFloat(value); if (isNaN(tmp)) return 0; return tmp; case 'Int': return value|0; case 'String': if (t=='html') return JSON.stringify(this.DOMtoJSON(value)); if (t=='array') return value.join(''); if (t=='object') return JSON.stringify(value); if (t=='boolean') return !!value; if (t=='null') return 'null'; if (t=='undefined') return 'undefined'; else return value.toString(); case 'Array': if (t=='undefined'||t=='null') return []; if (t=='html') return Object.values(this.DOMtoJSON(value)); if (t=='object') return Object.values(value); if (t=='string') {try {let z=JSON.parse(t); let v=this.getType(z)=='array'; if (v) return z; throw 'err';} catch (err) {} return value.split('');} if (t=='number'||t=='int'||t=='float') {return (''+value).split('');} else return [value]; case 'JSON': if (t=='html') return this.DOMtoJSON(value); if (t=='object'||t=='string'||t=='array'||t=='null'||t=='number' ) return value; throw new TypeError(`Cannot convert ${t} to ${type}`); case 'Object': return Object(value); case 'Boolean': return Boolean(value); case 'List': let ul=document.createElement('ul'); if (t=='object'||t=='array'||t=='html') {for (let i in value) {let li=document.createElement('li'); if (t=='object') {let span=document.createElement('span'); span.className='convert_key'; span.innerText=i; li.append(span); li.appendChild(document.createTextNode(': '));} let span=document.createElement('span'); span.className='convert_value'; let ty=this.getType(value[i]); if (ty=='String'||ty=='Number'||ty=='Int'||ty=='Float') {if (outerType=='Array') {let li2=document.createElement('li'); li2.innerText=gt(value[i], type, outerType); if (ty=='String') li2.innerText=`"${li2.innerText}"`; span.append(li2);} else {span.innerText=`"${value[i]}"`;}} else if (ty=='Array') {span.append('['); span.append(gt(value[i], type, 'Array')); span.append(']');} else if (ty=='Object') {span.append(gt(value[i], type));} else span.innerText=`${value[i]}`; span.className +=` ${ty}`; li.append(span); ul.append(li);} return ul;} else if (t=='int'||t=='float'||t=='string'||null) {let li=document.createElement('li'); li.textContent=value; ul.append(li);} return ul;};}.bind(this); if (typeof type!='string') {let r=value; console.log(type.length); for (let i=0; i<type.length; i++) {r=gt(r, type[i]); console.log({r, type: type[i]}); if (i!=length -1) {if (r.map) {r=r.map(j=>{console.log({each: this.convert(j, type[i+1]), type: type[i+1]}); return this.convert(j, type[i+1]);});}} console.log(r);}}; return gt(value, type);}, getType (value) {for (let i in this.types) {try {if (this.types[i](value)) return i;} catch (err) {continue}}}, sizeof(object) {if (object instanceof Set||object instanceof Map) return object.size; if (object instanceof Array||object instanceof String) return object.length; if (object instanceof Object) return Object.keys(object).length; if (object===void 0||object===null) {return 0;} return Object.keys(object).length;}, deepFreeze (object) {const propNames=Object.getOwnPropertyNames(object); for (const name of propNames) {const value=object[name]; if (value&&typeof value==="object") {globalThis.BS.deepFreeze(value);}} return Object.freeze(object);}, last(number) {if (number>0) return number - 1; return 0;}, storage: [], defineProperty(prototype, propertyName, valueCallback, options) {options=options||{writable: true, enumerable: false, configurable: true}; options.value=valueCallback; Object.defineProperty(prototype, propertyName, options);}, Object(object) {return object;}, Array(array) {if (array instanceof Array===false) array=BS.convert(array, 'Array'); let o=Object.create(null); let proto=['push', 'pop', 'shift', 'unshift', 'slice', 'splice', 'join', 'sort', 'map', 'forEach', 'indexOf', 'at', 'includes']; for (let i in proto) {BS.defineProperty(o, proto[i], function () {return Array.prototype[proto[i]].apply(this, arguments);});} array.__proto__=o; return array;},}; const BS=globalThis.BS; const TypedArray=Reflect.getPrototypeOf(Int8Array); for (const C of [Array, String, TypedArray]) {BS.defineProperty(C.prototype, "at", function at(n) {n=Math.trunc(n)||0; if (n<0) n +=this.length; if (n<0||n>=this.length) return undefined; return this[n];}); BS.defineProperty(C.prototype, "last", function last() {return this[this.length-1];});} BS.defineProperty(String.prototype, "noBreaks", function noBreaks() {return this.replace(/\r\n?/g, '');}); function list (amount, callback) {let array=[]; for (let i=0; i<amount; i++) {if (typeof callback==='function') {console.log(i); array.push(callback(i));} else {array.push(callback);}} return array;} const log=(...args)=>console.log(...args), sizeof=function sizeof (object) {if (object===void 0||object===null) {throw new TypeError('Cannot convert undefined or null to object');} if (object instanceof Set||object instanceof Map) {return object.size;} return Object.keys(object).length;}; function clear_function_value(v) {if (typeof v!=='function') return v; let r=Object.create(null); r.name=v.name; r.value=v.value.toString(); r.type='function'; return r;} function get_clear_value(v) {if (typeof v!='object'||v===null||v.constructor=='Date') {return v;} let r=Object.create(null); if (BS.getType(v)=='Array') {r=BS.Array([]);} for (let i in v) {if (v[i] instanceof Variable) {if (v[i].name=='this') continue; else r[i]=v[i].value;} else if (BS.getType(v[i])=='Object'&&v[i].constructor=='Date') {r[i]=get_clear_value(v[i]);} else {r[i]=v[i];}} return r;} function $get(object, property, unclearValue) {if (object===null||object===void 0) {throw new TypeError(`Cannot read properties of "null"`);} let v=object[property]; if (v!==void 0) {if (v instanceof Variable) {return v.value;} if (BS.getType(v)=='Object') {if (unclearValue) return v; return get_clear_value(v);} return v;} return null;} function $free(object, scope) {if (scope) {if (!object) {throw new TypeError(`Attempt to delete non-existing variable`);} scope.delete(object); return;}} function $delete(object, property) {if (object===null||object===void 0) {throw new TypeError(`Cannot read or delete properties of "null"`);} let type=BS.getType(object); if (type!='Array'&&type!='Object') {throw new TypeError(`Attempt to change immutable objects"`);} if (type=='Array'||type=='String') {if (isNaN(parseInt(property))) {return object;} try {object.splice(property, 1);} finally {return object;}} delete object[property]; return object;} function $return(localScope, globalScope, value) {$clearScope(localScope, globalScope); return value;} function $clearScope(localScope, globalScope) {localScope.scopes.pop(); globalScope.scopes.pop();} function $add(value1, value2) {if (Array.isArray(value1)&&Array.isArray(value2)) {return [].concat(value1, value2);} if (Array.isArray(value1)) {return [].concat(value1, value2)} if (BS.getType(value1)=='Object'&&BS.getType(value2)=='Object') {return Object.assign({}, value1, value2);} if (value1===null||value2===null) {throw new TypeError('"null" cannot be used as in math expressions');} if (typeof value1==='string') {if (typeof value2!=='string') {throw new TypeError('String was expected for concatination, got "'+BS.getType(value2)+'" insetead');} return value1 + value2;} if (typeof value1==='number') {if (typeof value2!=='number') {throw new TypeError('Number was expected for math expression, got "'+BS.getType(value2)+'" insetead');} return value1 + value2;} return value1 + value2;} function $update(obj, property, value) {if (!property in obj) {throw new Error(`Property "${property}" is not found`);} return obj[property]=value;} function $new(value) {return new value;}const range=function range(start, stop, include=false) {if (stop===undefined) {stop=start; start=0;} if (include) {if (start>stop) {stop--;} else {stop++;}} let i=start; 
+ return {[Symbol.iterator]: ()=>{return {next() {while (i!==stop) {let temp=i; if (start>stop) i--; else i++; return {value: temp, done: false,}} return {done: true};}}}}}; const isNaN=function isNaN(number) {return typeof number=='number'&&number!==number;}; const BUILT_IN_VALUES={Infinity: Infinity, NaN: NaN, range: range, 
+ isNaN: isNaN, 
+ empty: function empty(object) {if (['array', 'string', 'object'].includes(typeof object)) {return Object.keys(object).length==0;} throw new TypeError(`Unexpected type of argument for "empty" function. "array", "string" or "object" was expected`)}, round: function round(object) {return Math.round(object)},}; class Variable {constructor(name, type, value, constant=false, ignoreError=false) {this.name=name; this.type=type; this.value=value===void 0 ? null : value; this.constant=constant; this.ignoreError=ignoreError;} set realValue(value) {if (this.constant&&!this.ignoreError) {throw new Error(`Attempt to change value of constant "${this.name}"`)} else if (this.constant) {return this.value;} if (this.type=='let'||this.type=='\\' ) return this.value; if (this.type!==null&&BS.getType(value)!=this.type) {throw new TypeError(`Assignment of a different type to variable "${this.name}" rather than "${this.type}" is prohibited`);} this.value=value;} get realValue () {return this.value;} update(operator, value) {this.value=eval('this.value' + operator + 'value');}} class Scopes {constructor() {this.scopes=[]; this.globalScope=null;} new(level, parent=this) {let scope=new Scope(level, parent); parent.scopes.push(scope); return scope;} global() {let $0=this.new(0); $0.set('this', $0.variables, true, true, true); $0.init(BUILT_IN_VALUES); this.globalScope=$0; return $0;} append_to_global(object) {for (let i in object) {this.globalScope.set(i, object[i], true, true); BUILT_IN_VALUES[i]=object[i];}}} class Scope {constructor(level, parent) {this.level=level; this.variables={}; this.scopes=[]; this.parent=parent;} get(propertyName, unclearValue) {if (this.variables[propertyName]!==void 0) {if (unclearValue) return this.variables[propertyName].value; return this.variables[propertyName].realValue;} let level=this.level; if (level==0||!this.parent) {console.warn(`Variable "${propertyName}" has never been declared. "null" is returned instead.`); return null;} return this.parent.get(propertyName);} getScope(propertyName) {if (this.variables[propertyName]) {return this;} let level=this.level; if (level==0||!this.parent) return null; return this.parent.getScope(propertyName);} init(values) {for (let i in values) {this.set(i, values[i], true, true);}} set(propertyName, value, local=false, constant=false, ignoreError=false) {if (local||constant) {let v=this.variables[propertyName]; if (!v) {this.variables[propertyName]=new Variable(propertyName, null, value, constant, ignoreError)} else {this.variables[propertyName].realValue=value;} return null;} let scope=this.getScope(propertyName); if (scope==null) {scope=this;} let v=scope.variables[propertyName]; if (!v) {scope.variables[propertyName]=new Variable(propertyName, null, value, constant);} else {scope.variables[propertyName].realValue=value;} return null;} delete(propertyName) {if (typeof propertyName!='string') {for (let i in this.variables) {if (this.variables[i].value==propertyName) {delete this.variables[i]; return true;}}} if (this.variables[propertyName]) {delete this.variables[propertyName]; return true;} let level=this.level; if (level==0||!this.parent) return false; return this.parent.delete(propertyName);}} const scopes=new Scopes(); const $0=scopes.global(); 
+// your code below this line
+
+(function() {
+    class date {
+        constructor() {}
+        get now() {
+            return Date.now()
         }
-        if (value0 != min)
-            output = output.reverse();
-        return output;
-    },
-    delete (value, index) {
-        // if (typeof value === 'string') {
-        //     return value.substring(0, index) + value.substring(index+1, value.length);
-        // }
-        Array.prototype.splice.call(value, index, 1);
-        return value;
-    },
-    slice (value, start, end, step = 1, line, col) {
-        if (!Array.isArray(value) && typeof value != 'string') {
-            throw new TypeError(`Array or string was expected at line ${line}, col ${col}`);
+        // !TODO: implement
+        //setDate(value) {
+        //    if (typeof value != 'object' || value.constructor != Object) {
+        //        throw TypeError('setDate() expects an object.')
+        //    }
+        //    for (let i in value) {
+        //        if (typeof value[i] != 'number' || value[i] < 0 || isNaN(value[i])) {
+        //            throw TypeError('setDate() expects an object with positive number values.')
+        //        }
+        //    }
+        //    let _date = new Date();
+        //    if (value.hasOwnProperty('year')) {
+        //        _date.setFullYear(value.year);
+        //    }
+        //    if (value.hasOwnProperty('month')) {
+        //        _date.setMonth(value.month);
+        //    }
+        //    if (value.hasOwnProperty('day')) {
+        //        _date.setDate(value.day);
+        //    }
+        //    if (value.hasOwnProperty('hours')) {
+        //        _date.setHours(value.hours);
+        //    }
+        //    if (value.hasOwnProperty('minutes')) {
+        //        _date.setMinutes(value.minutes);
+        //    }
+        //    if (value.hasOwnProperty('seconds')) {
+        //        _date.setSeconds(value.seconds);
+        //    }
+        //    if (value.hasOwnProperty('milliseconds')) {
+        //        _date.setMilliseconds(value.milliseconds);
+        //    }
+        //    _date.prototype = date
+        //    return _date;
+        //}
+        get ms() {
+            return new Date().getMilliseconds()
         }
-        if (typeof start != 'number') {
-            throw new TypeError(`Number was expected at line ${line}, col ${col}`);
+        get seconds() {
+            return new Date().getSeconds()
         }
-        if (end === null && step === null) {
-            return value.slice(start);
+        get msInSecond() {
+            return 1000
         }
-        step = step|0;
-        if (step >= 0) step = 1;
-        else step = -1;
-            // throw new Error(`Step argument on slicing must not be zero at line ${line}, col ${col}`);
-        // if (step !== 1 && step !== -1)
-        //     throw new Error(`Step must be 1 or -1 at ${line}, col ${col}`);
-        let result = value.slice(start, end);
-        if (step === -1) {
-            if (typeof value === 'string')
-                return Array.from(result).reverse().join('');
-            return result.reverse();
+        get minutes() {
+            return new Date().getMinutes()
         }
-        return result;
-    },
-    //ast: (function () {
-    //    let r = globalThis.require('./index');
-    //    if (r) return r;
-    //    return function () {console.warn('Ast is not supported yet in browsers.')}
-    //})(),
-    //parse: (function () {
-    //    let r = globalThis.require('./ast_to_js.js');
-    //    if (r) return r;
-    //    return function () {console.warn('@eval is not supported yet in browsers.')}
-    //})(),
-    //fs: (function () {
-    //    let r = globalThis.require('fs');
-    //    console.log(r);
-    //    if (r) return r;
-    //    return function () {console.warn('@import is not supported yet in browsers.')};
-    //})(),
-    customTypes: {},
-    types: {
-        Array (value) {
-            return Array.isArray(value);
-        },
-        Null (value) {
-            return value === null;
-        },
-        Undefined (value) {
-            return value === void 0;
-        },
-        Int (value) {
-            return parseInt(value) === value && !Number.isNaN(value);
-        },
-        Float (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        Number (value) {
-            return typeof value === 'number' && !Number.isNaN(value);
-        },
-        BigInt(value) {
-            return typeof value === 'bigint';
-        },
-        NaN (value) {
-            return Number.isNaN(value);
-        },
-        String (value) {
-            return typeof value === 'string';
-        },
-        Function (value) {
-            return typeof value === 'function';
-        },
-        Symbol (value) {
-            return typeof value === 'symbol';
-        },
-        Boolean (value) {
-            return typeof value === 'boolean';
-        },
-        Object(value) {
-            if (BS.types.HTML && BS.types.HTML(value)) {
-                return false;
-            }
-            return typeof value === 'object' && value !== null;
-        },
-    },
-    checkArgType(type, value, line, col) {
-        if (type in this.customTypes) {
-            let r = BS.customTypes[type];
-            if (r && r(value))
-                return true;
+        get msInMinute() {
+            return 60000
         }
-        if (type in this.types) {
-            let r = BS.types[type];
-            if (r && r(value))
-                return true;
+        get hours() {
+            return new Date().getHours()
         }
-        throw new TypeError(`Argument "${value}" is not type of "${type}" at line ${line}, col ${col}.`);
-    },
-    convert(value, type, outerType) {
-        let t = this.getType(value);
-        if (t) t = t.toLowerCase();
-        let tmp = null;
-        if (typeof type !== 'object' && t == type.toLowerCase()) return value;
-        let gt = function (value, type, outerType) {
-            outerType = outerType || this.getType(value);
-            switch (type) {
-                case 'Number':
-                case 'Float':
-                    tmp = parseFloat(value);
-                    if (isNaN(tmp)) return 0;
-                    return tmp;
-                case 'Int':
-                    return value|0;
-                case 'String':
-                    if (t == 'html') return JSON.stringify(this.DOMtoJSON(value));
-                    if (t == 'array') return value.join('');
-                    if (t == 'object') return JSON.stringify(value);
-                    if (t == 'boolean') return !!value;
-                    if (t == 'null') return 'null';
-                    if (t == 'undefined') return 'undefined';
-                    else return value.toString();
-                case 'Array':
-                    if (t == 'undefined' || 'null') return []
-                    if (t == 'html') return Object.values(this.DOMtoJSON(value));
-                    if (t == 'object') return Object.values(value);
-                    if (t == 'string') {
-                        try {
-                            let z = JSON.parse(t);
-                            let v = this.getType(z) == 'array';
-                            if (v) return z;
-                            throw 'err';
-                        } catch (err) {}
-                        return value.split('');
-                    }
-                    if (t == 'number' || t == 'int' || t == 'float') {
-                        return (''+value).split('');
-                    }
-                    else return [value];
-                case 'JSON':
-                    if (t == 'html') return this.DOMtoJSON(value);
-                    if (t == 'object' || t == 'string' || t == 'array' || t == 'null' || t == 'number' )
-                        return value;
-                    throw new TypeError(`Cannot convert ${t} to ${type}`);
-                case 'Object':
-                    return Object(value);
-                case 'Boolean':
-                    return Boolean(value);
-                case 'List':
-                    let ul = document.createElement('ul');
-                    if (t == 'object' || t == 'array' || t == 'html') {
-                        for (let i in value) {
-                            let li = document.createElement('li');
-                            if (t == 'object') {
-                                let span = document.createElement('span');
-                                span.className = 'convert_key';
-                                span.innerText = i;
-                                li.append(span);
-                                li.appendChild(document.createTextNode(': '));
-                            }
-                            let span = document.createElement('span');
-                            //let li2;
-                            //if (ty == 'Array')
-                            //    li2 = document.createElement('li');
-                            span.className = 'convert_value';
-                            let ty = this.getType(value[i]);
-                            if (ty == 'String' || ty == 'Number' || ty == 'Int' || ty == 'Float') {
-                                //span.className += ' string';
-                                if (outerType == 'Array') {
-                                    let li2 = document.createElement('li');
-                                    li2.innerText = gt(value[i], type, outerType);
-                                    if (ty == 'String') li2.innerText = `"${li2.innerText}"`;
-                                    span.append(li2);
-                                    //span.append(li) = `"${value[i]}"`;
-                                } else {
-                                    span.innerText = `"${value[i]}"`;
-                                }
-                            } else if (ty == 'Array') {
-                                //debugger
-                                //span.className += ' array';
-                                //span.innerText = JSON.stringify(value[i], null, 2);
-                                span.append('[')
-                                span.append(gt(value[i], type, 'Array'))
-                                span.append(']')
-                            } else if (ty == 'Object') {
-                                //span.innerText = JSON.stringify(value[i], null, 2);
-                                //let innerSpan = gt(value[i], type)
-                                span.append(gt(value[i], type))
-                            }
-                            else span.innerText = `${value[i]}`;
-                            span.className += ` ${ty}`;
-                            li.append(span);
-                            //if (li2) li.append(li2);
-                            ul.append(li);
-                        }
-                        return ul;
-                    } else if (t == 'int' || t == 'float' || t == 'string' || null) {
-                        let li = document.createElement('li');
-                        li.textContent = value;
-                        ul.append(li);
-                    }
-                    return ul;
-            };
-        }.bind(this);
-        if (typeof type != 'string') {
-            let r = value;
-            // debugger
-            console.log(type.length);
-            for (let i = 0; i < type.length; i++) {
-                r = gt(r, type[i]);
-                console.log({r, type: type[i]});
-                if (i != length -1) {
-                    if (r.map) {
-                        r = r.map(j => {
-                            console.log({each: this.convert(j, type[i+1]), type: type[i+1]});
-                            return this.convert(j, type[i+1]);
-                        });
-                    }
-                }
-                console.log(r);
-            }
-        };
-        // console.log('h', gt(value,type))
-        return gt(value, type);
-    },
-    getType (value) {
-        for (let i in this.types) {
-            try {
-                if (this.types[i](value)) return i;
-                //if (this.curstomTypes[i](value)) return i;
-            } catch (err) {continue}
+        get msInHour() {
+            return 3600000
         }
-    },
-    sizeof(object) {
-        // ? Can be simplified
-        //* No need for so many checks
-        if (object instanceof Set || object instanceof Map)
-            return object.size;
-        if (object instanceof Array || object instanceof String)
-            return object.length;
-        if (object instanceof Object)
-            return Object.keys(object).length;
-        //else return 0
-        if (object === void 0 || object === null) {
-            return 0
-            //throw new TypeError('Cannot convert undefined or null to object');
+        get day() {
+            return new Date().getDay()
         }
-        return Object.keys(object).length;
-    },
-    deepFreeze (object) {
-        // Retrieve the property names defined on object
-        const propNames = Object.getOwnPropertyNames(object);
-        // Freeze properties before freezing self
-        for (const name of propNames) {
-            const value = object[name];
-
-            if (value && typeof value === "object") {
-                globalThis.BS.deepFreeze(value);
-            }
+        get msInDay() {
+            return 86400000
         }
-        return Object.freeze(object);
-    },
-    last(number) {
-        // returns the last index of array item
-        if (number > 0) return number - 1;
-        return 0;
-    },
-    storage: [],
-    // require('./ast_to_js.js')// || function () {console.warn('@eval is not supported yet in browsers.')}
-};
-const BS = globalThis.BS;
-
-const TypedArray = Reflect.getPrototypeOf(Int8Array);
-for (const C of [Array, String, TypedArray]) {
-    Object.defineProperty(C.prototype, "at", {
-        value: function at(n) {
-            // ToInteger() abstract op
-            n = Math.trunc(n) || 0;
-            // Allow negative indexing from the end
-            if (n < 0) n += this.length;
-            // OOB access is guaranteed to return undefined
-            if (n < 0 || n >= this.length) return undefined;
-            // Otherwise, this is just normal property access
-            return this[n];
-        },
-        writable: true,
-        enumerable: false,
-        configurable: true
-    });
-    Object.defineProperty(C.prototype, "last", {
-        value: function last() {
-            return this[this.length-1];
-        },
-        writable: true,
-        enumerable: false,
-        configurable: true
-    });
-}
-Object.defineProperty(String.prototype, "noBreaks", {
-    value: function noBreaks() {
-        return this.replace(/\r\n?/g, '');
-    },
-    writable: true,
-    enumerable: false,
-    configurable: true
-});
-// ! causes issues in for in loop
-//Array.prototype.last = function () {
-//    return this[this.length - 1];
-//};
-function list (amount, callback) {
-    let array = [];
-    for (let i = 0; i < amount; i++) {
-        if (typeof callback === 'function') {
-            console.log(i);
-            array.push(callback(i));
-        } else {
-            array.push(callback);
-        }
-    }
-    return array;
-}
-function range(start, stop, include = false){
-    if (stop === undefined) {
-        stop = start;
-        start = 0;
-    }
-    if (include) {
-        if (start > stop) {
-            stop--;
-        } else {
-            stop++
+        get month() {
+            return new Date().getMonth()
         }
-    }
-    let i = start; // start
-    return { // iterator protocol
-        [Symbol.iterator]:() => { // @@iterator
-            return { // object with the next function
-                next () {
-                    while(i !== stop){
-                        let temp = i;
-                        if (start > stop) i--;
-                        else i++;
-                        return {
-                            value: temp,
-                            done: false,
-                        }
-                    }
-                    return {done: true}
-                }
-            }
+        get msInMonth() {
+            return 2628000000
         }
-    }
-}
-const PI = 3.141592653589793,
-    E = 2.718281828459045,
-    log = (...args) => console.log(...args),
-    sqrt = Math.sqrt.bind(Math),
-    Time = {
-        get now () {
-            return Date.now()
-        },
-        get ms () {
-            return new Date().getMilliseconds()
-        },
-        get seconds () {
-            return new Date().getSeconds()
-        },
-        get minutes () {
-            return new Date().getMinutes()
-        },
-        get hours () {
-            return new Date().getHours()
-        },
-        get day () {
-            return new Date().getDay()
-        },
-        get month () {
-            return new Date().getMonth()
-        },
-        get year () {
+        get year() {
             return new Date().getFullYear()
-        },
-    },
-    sizeof = function sizeof (object) {
-        if (object === void 0 || object === null) {
-            throw new TypeError('Cannot convert undefined or null to object');
         }
-        if (object instanceof Set || object instanceof Map) {
-            return object.size;
+        get msInYear() {
+            return 31536000000
         }
-        return Object.keys(object).length;
     };
-
-
-// your code below this line
-
-a = 10;
-local.get("a").f();
\ No newline at end of file
+    scopes.append_to_global({
+        Date: new date()
+    });
+})();
+(function() {
+    console.log(get_clear_value($get($0.get("Date"), "now")));
+    console.log(get_clear_value($get($0.get("Date"), "year")));
+    console.log(get_clear_value($get($0.get("Date"), "msInYear")));
+})();
\ No newline at end of file