2635. Apply Transform Over Each Element in Array
Easy
319
14

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.
```

Example 2:

```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.
```

Example 3:

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

Constraints:

• `0 <= arr.length <= 1000`
• `-109 <= arr[i] <= 109`
• `fn returns a number`
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