created mapFunction

map.js

@@ -0,0 +1,30 @@
+// Do NOT use .map, to complete this function.
+/* 
+How map works: Map calls a provided callback function once
+for each element in an array,  in order, and function constructs a new array from the res .
+Produces a new array of values by mapping each value in list 
+through a transformation function (iteratee).
+ Return the new array.
+*/
+
+function map(elements, cb) {
+
+     let resultArr=[];
+
+    for(let index=0;index<elements.length;index++){
+
+    /*we will pass array's element, index in cb function so it will return some value 
+     then we will store that value to new array (resultArr)
+     */ 
+         let newValue=cb(elements[index],index);
+         resultArr.push(newValue);
+    }
+
+    /*after Iterating over a list of elements and storing in new Array we will
+    return that new Array ; 
+    */
+
+    return resultArr;
+}
+
+module.exports=map;

readme.md

@@ -32,7 +32,7 @@ function each(elements, cb) {
 ```
 function map(elements, cb) {
     // Do NOT use .map, to complete this function.
-    // How map works: Map calls a provided callback function once for each element in an array, in order, and functionructs a new array from the res .
+    // How map works: Map calls a provided callback function once for each element in an array, in order, and function constructs a new array from the res .
     // Produces a new array of values by mapping each value in list through a transformation function (iteratee).
     // Return the new array.
 }

test/testMap.js

@@ -0,0 +1,11 @@
+const mapFunc=require('../map');
+
+const items = [1, 2, 3, 4, 5, 5];
+
+ function squareFunc(element){
+     return element*element;
+ }
+
+let squares=mapFunc(items,squareFunc);
+
+console.log(`square of ${items} : ${squares}`);