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Commit 45b31fd

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Day 5 problem solved
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  • LeetCode/30daysJavaScript/5.Apply_Transform_Over_Each_Element_in_Array

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/*
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Apply Transform Over Each Element in Array
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Given an integer array arr and a mapping function fn, return a new array with a transformation applied to each element.
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The returned array should be created such that returnedArray[i] = fn(arr[i], i).
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Please solve it without the built-in Array.map method.
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Example 1:
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Input: arr = [1,2,3], fn = function plusone(n) { return n + 1; }
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Output: [2,3,4]
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Explanation:
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const newArray = map(arr, plusone); // [2,3,4]
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The function increases each value in the array by one.
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Example 2:
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Input: arr = [1,2,3], fn = function plusI(n, i) { return n + i; }
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Output: [1,3,5]
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Explanation: The function increases each value by the index it resides in.
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Example 3:
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Input: arr = [10,20,30], fn = function constant() { return 42; }
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Output: [42,42,42]
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Explanation: The function always returns 42.
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Constraints:
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0 <= arr.length <= 1000
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-109 <= arr[i] <= 109
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fn returns an integer.
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*/
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function map(arr: number[], fn: (n: number, i: number) => number): number[] {
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const arr2: number[] = [];
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for (let i = 0; i < arr.length; i++) {
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const ele: number = fn(arr[i], i);
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arr2.push(ele);
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}
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return arr2;
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};
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const namArr: number[] = [1, 2, 3];
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const calFn = (n: number, i: number): number => {
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return n + i;
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};

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