Program to group anagrams from a given string array

find_anagrams.js

function groupAnagrams(strArr) {
    var newArr = strArr.slice(0); // To avoid changes in original array
    var size = newArr.length,
        output = [],
        i = 0,
        tmp, str1, str2;

    while (size) {
        str1 = newArr[0];
        size = removeElement(newArr, 0, size);
        i = 0;
        tmp = [str1];
        while (size && i < size) {
            str2 = newArr[i];
            if (isAnagram(str1, str2)) {
                tmp.push(str2);
                size = removeElement(newArr, i, size);
                i--;
            }
            i++;
        }
        output.push(tmp);
    }

    return output;
}

function removeElement(arr, i, size) {
    if (size <= 1) {
        return 0;
    }

    arr[i] = arr[size - 1];
    return --size;
}


function isAnagram(str1, str2) {
    if (typeof str1 !== 'string' || typeof str2 !== 'string') {
        return false;
    }

    var map = {},
        len1 = str1.length,
        len2 = str2.length,
        i = 0,
        numOfChars = 0;

    while (i < len1) {
        count = map[str1[i]] || 0;
        count++;
        map[str1[i]] = count;
        numOfChars++;
        i++;
    }

    i = 0;
    while (i < len2) {
        if (!map[str2[i]]) {
            return false;
        }
        map[str2[i]]--;
        numOfChars--;
        i++;
    }

    return numOfChars === 0;
}

var input = ["xyz", "abcd", "dcab", "zxy", "hello", "bacd"];
console.log(groupAnagrams(input));