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g2701_2800.s2724_sort_by.readme.md Maven / Gradle / Ivy

2724\. Sort By

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`. `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 * 105