function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}

function mostFrequentWord(text) {
  let words = getTokens(text); // get an array words, split based on the regex, lowercase them for ease of comparison, removed boolean values
  let wordFrequencies = {}; //create an object to hold the words
  for (let i = 0; i <= words.length; i++) { //iterate over the word array
    if (words[i] in wordFrequencies) {
      wordFrequencies[words[i]]++; //if the word has has already been added to the object, add 1 to its count
    } else {
      wordFrequencies[words[i]] = 1; // this word isnt in the object yet so add it and set its count to 1
    }
  }
  let currentMaxKey = Object.keys(wordFrequencies)[0]; //to start somewhere, lets set our max word to the first word in keys of object
  let currentMaxCount = wordFrequencies[currentMaxKey]; // same thing here but setting to the count of our first key

  for (let word in wordFrequencies) {  //iterate over our word object
    if (wordFrequencies[word] > currentMaxCount) { //now we compare if the current word we are looking at has a higher count than whatever currentMaxCount is set to
      currentMaxKey = word;  //if we are here it means we have a new high count so set our current high word to max
      currentMaxCount = wordFrequencies[word]; //same thing here but with the count value of our new high word
    }
  }
  return currentMaxKey;  //now that weve run through the entire object we know what our highest count word is so return it
}