Group Anagrams

Problem statement

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.

Example 1:

Input: strs = ["eat","tea","tan","ate","nat","bat"]Output: [["bat"],["nat","tan"],["ate","eat","tea"]]

Example 2:

Input: strs = [""]Output: [[""]]

Example 3:

Input: strs = ["a"]Output: [["a"]]

Constraints:

• 1 <= strs.length <= 104
• 0 <= strs[i].length <= 100
• strs[i] consists of lowercase English letters.

My solution

/**
 * @param {string[]} strs
 * @return {string[][]}
 */
var groupAnagrams = function(strs) {
    let memo = new Map();
    let strCount = new Map();
    
    const baseValue = "a".charCodeAt(0);
    
    for (let str of strs) {
        const strValue = Array.from({
            length: 26
        }, () => 0);
        
        for (const c of str) {
            strValue[c.charCodeAt(0) - baseValue]++
        }
        
        strCount.set(str, strValue.join(":"))
    }
    
    // console.log(strCount)
    
    for (const str of strs) {
        const key = strCount.get(str);
        const list = memo.get(key) || [];
        list.push(str);
        memo.set(key, list)
    }
    
    // console.log(memo)
    
    
    return [...memo.values()]
};