Subject: 2635. Transform each element in an array

​The source of the topic

        Leetcode topic, website: 2635. Convert each element in the array - LeetCode

Problem-solving ideas:

       Simulate as required.

Problem-solving code:

/**
 * @param {number[]} arr
 * @param {Function} fn
 * @return {number[]}
 */
var map = function(arr, fn) {
    var returnedArray=new Array();
    for(var i=0;i<arr.length;i++){
        returnedArray[i]=fn(arr[i],i);
    }
    return returnedArray;
};

Summarize:

        No official solution.

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