https://leetcode.com/problems/group-anagrams/

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/**
 * @param {string[]} strs
 * @return {string[][]}
 */
var groupAnagrams = function(strs) {
    let res = {}
    for (let i = 0; i < strs.length; i++) {
        let str = strs[i].split('').sort().join('')
        if (!res[str]) {
            res[str] = []
        }
        res[str].push(strs[i])
    }
    return Object.values(res)
};