Group Anagrams

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Write a function groupAnagrams(arr) that takes an array of strings arr and groups anagrams together. Conditions:

An anagram is a word or phrase formed by rearranging the letters of another word or phrase (e.g., "tea" => "eat").

Input 1: ["ab", "ba", "abc", "bca"]

Output 1: [["abc","bca"],["ab","ba"]]

Input 2: ["listen", "silent", "enlist"]

Output 2: [["listen","silent","enlist"]]

Run your code to see results.