Custom Sort Function
Intuition\n Describe your first thoughts on how to solve this problem. \nThe intuition behind the sortBy function is to provide a flexible way to sort arrays ba
# Intuition\n<!-- Describe your first thoughts on how to solve this problem. -->\nThe intuition behind the sortBy function is to provide a flexible way to sort arrays based on any criterion defined by the user. By applying a callback function fn to each element in the array, we can determine the sort order dynamically. This approach leverages the built-in sort method but enhances its functionality with custom sorting logic.\n\n# Approach\n<!-- Describe your approach to solving the problem. -->\nFunction Definition: The sortBy function accepts an array and a callback function as arguments.\n\nSorting Logic: It uses the sort method, passing a comparator function that applies fn to each element.\n\nComparator Function: The comparator function (a, b) => fn(a) - fn(b) ensures the array is sorted according to the values returned by fn.\n\nFlexible Sorting: This method allows sorting arrays of various types, including numbers, strings, and objects, based on any criteria.\n\n\n# Complexity\n- Time complexity: The sort method in JavaScript typically has a time complexity of O(n log n), where n is the number of elements in the array. This is due to the efficient sorting algorithms (like Timsort) used under the hood.\n<!-- Add your time complexity here, e.g. $$O(n)$$ -->\n\n- Space complexity: The space complexity is generally O(1) for in-place sorting. However, additional space may be used for temporary variables during sorting operations.\n<!-- Add your space complexity here, e.g. $$O(n)$$ -->\n\n# Code\n```javascript []\n/**\n * @param {Array} arr\n * @param {Function} fn\n * @return {Array}\n */\nvar sortBy = function(arr, fn) {\n    return arr.sort((a, b) => fn(a) - fn(b));\n};\n```
['JavaScript']