Add solution #2724

Author: JoshCrozier

README.md

@@ -408,6 +408,7 @@
 2695|[Array Wrapper](./2695-array-wrapper.js)|Easy|
 2703|[Return Length of Arguments Passed](./2703-return-length-of-arguments-passed.js)|Easy|
 2721|[Execute Asynchronous Functions in Parallel](./2721-execute-asynchronous-functions-in-parallel.js)|Medium|
+2724|[Sort By](./2724-sort-by.js)|Easy|
 3042|[Count Prefix and Suffix Pairs I](./3042-count-prefix-and-suffix-pairs-i.js)|Easy|
 3110|[Score of a String](./3110-score-of-a-string.js)|Easy|
 3392|[Count Subarrays of Length Three With a Condition](./3392-count-subarrays-of-length-three-with-a-condition.js)|Easy|

solutions/2724-sort-by.js

@@ -0,0 +1,21 @@
+/**
+ * 2724. Sort By
+ * https://leetcode.com/problems/sort-by/
+ * Difficulty: Easy
+ *
+ * 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. sortedArr must be sorted in ascending order
+ * by fn output.
+ *
+ * You may assume that fn will never duplicate numbers for a given array.
+ */
+
+/**
+ * @param {Array} arr
+ * @param {Function} fn
+ * @return {Array}
+ */
+var sortBy = function(arr, fn) {
+  return arr.sort((a, b) => fn(a) - fn(b));
+};