code added

Author: Bharat2044

24_sortBy.js

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+// Question Link: https://leetcode.com/problems/sort-by/description/?envType=study-plan-v2&envId=30-days-of-javascript
+// Solution Link: https://leetcode.com/problems/sort-by/solutions/5446437/javascript-easy-solution-one-line-code/
+
+/*
+2724. Sort By
+
+Given an array arr and a function fn, return a sorted array sortedArr. You can assume fn only returns numbers and those numbers determine the sort order of sortedArr. sortedArray must be sorted in ascending order by fn output.
+
+You may assume that fn will never duplicate numbers for a given array.
+
+Example 1:
+Input: arr = [5, 4, 1, 2, 3], fn = (x) => x
+Output: [1, 2, 3, 4, 5]
+Explanation: fn simply returns the number passed to it so the array is sorted in ascending order.
+
+Example 2:
+Input: arr = [{"x": 1}, {"x": 0}, {"x": -1}], fn = (d) => d.x
+Output: [{"x": -1}, {"x": 0}, {"x": 1}]
+Explanation: fn returns the value for the "x" key. So the array is sorted based on that value.
+
+Example 3:
+Input: arr = [[3, 4], [5, 2], [10, 1]], fn = (x) => x[1]
+Output: [[10, 1], [5, 2], [3, 4]]
+Explanation: arr is sorted in ascending order by number at index=1. 
+
+Constraints:
+arr is a valid JSON array
+fn is a function that returns a number
+1 <= arr.length <= 5 * 10^5
+*/
+
+
+
+/**
+ * @param {Array} arr
+ * @param {Function} fn
+ * @return {Array}
+ */
+
+var sortBy = function(arr, fn) {
+    return arr.sort((a, b) => fn(a) - fn(b));
+};