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Group Anagrams

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

An Anagram is a word or phrase formed by rearranging the letters of a different word or phrase, typically using all the original letters exactly once.

Input: strs = ["eat","tea","tan","ate","nat","bat"]
Output: [["bat"],["nat","tan"],["ate","eat","tea"]]
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var groupAnagrams = function (strs) {
    if (!strs || !strs.length) {
        return null;
    let anagrams = {};
    for (let x = 0; x < strs.length; x++) {
        const sortedWord = strs[x].split('').sort().join();
        if (sortedWord in anagrams) {
        } else {
            anagrams[sortedWord] = [strs[x]];
    return Object.values(anagrams);
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Time Complexity : O(w*n*log(n))
Space Complexity : O(wn)

Discussion (2)

jonrandy profile image
Jon Randy • Edited on

Using the upcoming Array.groupBy (already available in Firefox Nightly):

const groupAnagrams = arr=>Object.values(arr.groupBy(i=>[...i].sort()))
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styluso7 profile image
Stylus07 Author

@jonrandy thanks