arrayelement

Author: nilajcoder

Programs/Exercise/arrayele.js

@@ -0,0 +1,39 @@
+
+/*
+
+Apply Transform Over Each Element in Array
+-----------------------------------------------------
+Given an integer array arr and a mapping function fn,
+ return a new array with a transformation applied to each element.
+
+The returned array should be created such that
+ returnedArray[i] = fn(arr[i], i).
+
+Please solve it without the built-in Array.map method.
+
+ 
+
+Example 1:
+
+Input: arr = [1,2,3], fn = function plusone(n) { return n + 1; }
+Output: [2,3,4]
+Explanation:
+const newArray = map(arr, plusone); // [2,3,4]
+The function increases each value in the array by one. 
+*/
+
+var map = function(arr, fn) {
+    const result = [];
+
+    for (let i = 0; i < arr.length; i++) {
+        result.push(fn(arr[i], i));
+    }
+
+    return result;
+};
+
+function plusOne(n) {
+    return n + 1;
+}
+
+console.log(map([1,2,3], plusOne)); // [2,3,4]