Advanced Testing Practice - Patrick Creamer

src/services/array-functions.js

@@ -7,53 +7,80 @@
 //fnc is a function that must return something, capture whatever it returns in a variable
 //add the returned value from fnc to the new array
 //after looping, return the new array
-export function map(theArray, fnc){
 
+export function map(theArray, fnc){
+  let output=[];
+  for(i=0;i<theArray.length;i++){
+    output.push(fnc(theArray[i]));
+  }
+  return output;
 }
 
+
 //create a new array
-//loop theArray and call the fnc for each thing in the array, 
+//loop theArray and call the fnc for each thing in the array,
 //     passing in the item from the current loop
 //fnc will return true or false, if true add the item to the new array else do not
 //return the new array
-export function filter(theArray, fnc){
 
+export function filter(theArray, fnc){
+  let output=[];
+  for (i=0;i<theArray.length;i++){
+    if (fnc(theArray[i])==true){
+      output.push(theArray[i]);
+    }
+  }
+  return output;
 }
 
 
-//loop theArray and call the fnc for each thing in the array, 
+//loop theArray and call the fnc for each thing in the array,
 //     passing in the item from the current loop
-//fnc will return true or false, if true return the item 
+//fnc will return true or false, if true return the item
 //return null
-export function find(theArray, fnc){
 
+export function find(theArray, fnc){
+  for (i=0;i<theArray.length;i++){
+    if (fnc(theArray[i])==true){
+      return theArray[i];
+    }
+  }
+  return null;
 }
 
 
 //return the last item in theArray
 export function findLast(theArray){
-
+  let lastly = theArray.length-1;
+  return theArray[lastly];
 }
 
 //return the first element of the array
 export function head(theArray){
-
+  return theArray[0];
 }
 
 //create a new array
 //loop theArray in reverse order
 //add the item from each loop to the new array
 //return the new array
-export function reverse(theArray){
 
+export function reverse(theArray){
+  let output=[];
+  for(i=theArray.length;i>-1;i--){
+    output.push(fnc(theArray[i]));
+  }
+  return output;
 }
 
 //create a new array
 //loop theArray
 //add the item from each loop to the new array except the first item
 //return the new array
-export function tail(theArray){
 
+export function tail(theArray){
+  theArray.splice(0,1);
+  return theArray;
 }
 
 //implement the most basic sorting algorithm there is
@@ -66,6 +93,64 @@ export function tail(theArray){
 //if a swap is done set it to true
 //after each for loop check the variable, if true, continue the while loop
 //if false return theArray
+
 export function sort(theArray){
+  let stillWorking = true;
+
+  while (stillWorking==true){
+    let swaps = 0;
+    for (i=0;i<(theArray.length-1);i++){
+      if(theArray[i]>theArray[i+1]){
+        let tempVal=theArray[i];
+        theArray[i]=theArray[i+1];
+        theArray[i+1]=tempVal;
+        swaps++;
+      }
+
+      if (swaps>0){
+        stillWorking=true;
+      }else {
+        stillWorking=false;
+      }
+
+    }
+  }
+  return theArray;
+}
 
+const names = ["Jon","Bob","Ted","Barney","Lilly","Robin","Saul","Axe"];
+const myNumbers = [4,3,55,22,99,1913,7,5,4,2,1];
+
+function addHello(name){
+  return "Hello " + name;
+}
+function findThree(name){
+  return name.length === 3;
 }
+function findBarney(name){
+  return name === "Barney";
+}
+
+
+
+console.log("should return the last element of an array 'Axe': "+findLast(names));
+
+console.log("should return the first element of an array 'Jon': "+head(names));
+
+console.log("should return the 7 names (everything after 'Jon'): "+tail(names));
+
+console.log("Map (should append hello): "+map(names,addHello));
+
+console.log("Numbers Raw: "+myNumbers+", Numbers sorted: "+sort(myNumbers));
+
+//filter should return an array with names of length 3
+//["Jon","Bob","Ted","Axe"]
+
+//find should find one name of "Barney"
+
+//findLast should find the last name of "Axe"
+
+//reverse should return an array with the elements in the opposite order
+//["Axe","Saul","Robin","Lilly","Barney","Ted","Bob","Jon"]
+//tail should return all elements in an array except the first one
+//[Bob","Ted","Barney","Lilly","Robin","Saul","Axe"];

src/tests/array-functions.test.js

@@ -11,6 +11,8 @@ function findThree(name){
 function findBarney(name){
   return name === "Barney";
 }
+
+
 //head should find the first element in the array "Jon"
 describe("head", () => {
   it("should return the first element of an array 'Jon'", () => {
@@ -53,5 +55,3 @@ describe("sort", () => {
 //["Axe","Saul","Robin","Lilly","Barney","Ted","Bob","Jon"]
 //tail should return all elements in an array except the first one
 //[Bob","Ted","Barney","Lilly","Robin","Saul","Axe"];
-
-