Most Frequent Word

/* Write a JavaScript function findMostFreqWord(str) that finds the most frequent word in a text
and prints it, as well as how many times it appears in format "word -> count".
Consider any non-letter character as a word separator. Ignore the character casing.
If several words have the same maximal frequency, print all of them in alphabetical order.
Write JS program frequentWord.js that invokes your function with the sample input data below
and prints the output at the console. */

"use strict";

function findMostFreqWord(str) {
    str = str.toLowerCase();
    var wordsArr = str.split(/\W+/).filter(Boolean);
    wordsArr.sort();
    var frequentWords = {};
    for (var i = 0; i < wordsArr.length; i += 1) {
        if (!(frequentWords.hasOwnProperty(wordsArr[i]))) {
            frequentWords[wordsArr[i]] = 0;
            for (var j = 0; j < wordsArr.length; j += 1) {
                if (wordsArr[j] === wordsArr[i]) {
                    frequentWords[wordsArr[i]]++;
                }
            }
        }
    }

    var maxFrequency = 1;
    for (var prop in frequentWords) {
        if (frequentWords.hasOwnProperty(prop)) {
            if (frequentWords[prop] > maxFrequency) {
                maxFrequency = frequentWords[prop];
            }
        }
    }

    for (prop in frequentWords) {
        if (frequentWords.hasOwnProperty(prop) && frequentWords[prop] == maxFrequency) {
            console.log("%s -> %d times", prop, frequentWords[prop]);
        }
    }
}

findMostFreqWord('in the middle of the night');
console.log();
findMostFreqWord('Welcome to SoftUni. Welcome to Java. Welcome everyone.');
console.log();
findMostFreqWord('Hello my friend, hello my darling. Come on, come here. Welcome, welcome darling.');