function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort(); // Normalizes input through removing and seperating by spaces/punctuation. Makes it lowercase, sorts it in alphabetical order, and filters out any falsy entries. Finally returns an array of strings.
}

function mostFrequentWord(text) {
  let words = getTokens(text); // calls the getTokens function and sets words to the output
  let wordFrequencies = {}; // Object declared outside of for loop to be used later
  for (let i = 0; i <= words.length; i++) {
    if (words[i] in wordFrequencies) { // if current array item is already entered in the object, then add +1 to the count
      wordFrequencies[words[i]]++;
    } else {
      wordFrequencies[words[i]] = 1; // otherwise, make a new word entry and mark it as appearing once
    }
  }
  /*
  Currently, we should have an object that looks like this:

  wordFrequencies = {
    hello: 3,
    thanks: 1,
    goodbye: 2
  }
  */
  let currentMaxKey = Object.keys(wordFrequencies)[0]; // Sets first key to be considered the most frequently used word (however may not be the case)
  let currentMaxCount = wordFrequencies[currentMaxKey]; // Gets the frequency of the word

  for (let word in wordFrequencies) { // For every word in wordFrequency, do this:
    if (wordFrequencies[word] > currentMaxCount) { // If the word we're currently looking at has a larger frequency count than our previously set word, set it to the current one
      currentMaxKey = word;
      currentMaxCount = wordFrequencies[word];
    }
    // this happens all the way through the array until we get the final result: the most frequently used word
  }
  return currentMaxKey; // return the most frequently used word
}