Anagram : Grouping words to two dimensional array based on anagram of word

anagram.js

function anagram(arr) {

    const forAnagram = {};

    // Creating function to place element/characters into specific index in some string
    function insertElement(word, idx, element) {
        let newString = '';
        for (let i = 0; i < word.length; i++) {
            if (i === idx) {
                newString += element;
            }

            newString += word[i];
        }

        return newString
    }


    // Make function to sorted the characters or word from arr
    function anagramSort(word) {
        let sorted = '';
        for (let i = 0; i < word.length; i++) {
            let passed = false; // this is for flag, to check the word already in sorted var
            let charToPlaced = word[i]; // add char to sorted var

            // Looping for sorted var to find the correct position for the char
            for (let j = 0; j < sorted.length; j++) {
                // This condition is to check if the current char in word is less than the char in sorted
                if (charToPlaced < sorted[j]) {
                    sorted = insertElement(sorted, j, charToPlaced); // Using above function to place the current char in sorted    
                    passed = true; // flag change, indicate flag has been placed
                    break; // stop the looping
                }
            }
            if (!passed) {
                sorted += charToPlaced
            }
        }

        return sorted;
    }

    // this is for grouping the word inside dictionary/object for anagram
    for (const arrays of arr) {
        const finalWord = anagramSort(arrays);
        if (!forAnagram[finalWord]) {
            forAnagram[finalWord] = [];
        }
        forAnagram[finalWord].push(arrays);
    }

    // And this is for extracting the anagram to be grouped in result array
    const result = [];
    for (const combine in forAnagram) {
        result.push(forAnagram[combine]);
    }

    return result;
}

let words = ['cook', 'save', 'taste', 'aves', 'vase', 'state', 'map'];
console.log(anagram(words))