apply-transform-over-each-element-in-array

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JavaScript

Given an integer array&nbsp;<code>arr</code>&nbsp;and a mapping function&nbsp;<code>fn</code>, return&nbsp;a new array with a transformation applied to each element.

The returned array should be created such that&nbsp;<code>returnedArray[i] = fn(arr[i], i)</code>.

Please solve it without the built-in <code>Array.map</code> method.

&nbsp;
Example 1:

<pre>
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. 
</pre>

Example 2:

<pre>
Input: arr = [1,2,3], fn = function plusI(n, i) { return n + i; }
Output: [1,3,5]
Explanation: The function increases each value by the index it resides in.
</pre>

Example 3:

<pre>
Input: arr = [10,20,30], fn = function constant() { return 42; }
Output: [42,42,42]
Explanation: The function always returns 42.
</pre>

&nbsp;
Constraints:

<ul>
	<li><code>0 &lt;= arr.length &lt;= 1000</code></li>
	<li><code>-109&nbsp;&lt;= arr[i] &lt;= 109</code></li>
	<li><code>fn</code> returns an integer.</li>
</ul>