function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}
  // This is the function declaration (mostFrequentWord) with a single argument (text). It is this function that will detect the most frequent word in a body of text.
function mostFrequentWord(text) {
  // This is a variable declaration (words) that is assigned to a function (getTokens(text) with the same argument (text) as the parent function.
  var words = getTokens(text);
  // This variable declaration (wordFrequencies) is assigned to an empty object.
  var wordFrequencies = {};
  // This is a for loop which will go through each item in an array (words is an array.)
  for (var i = 0; i <= words.length; i++) {
  // This is a Boolean checking if there is any text in the variable, words, in the object, wordFrequencies.
    if (words[i] in wordFrequencies) {
  // If true, this statement will check the entire object to see how many times this text appears in it (wordFrequencies).
      wordFrequencies[words[i]]++;
    }
  // If false, this statement equates the object to the value of 1.
    else {
      wordFrequencies[words[i]]=1;
    }
  }
  // This variable is assigned to the keys of values of the object (wordFrequencies) of the first item in the array.
  var currentMaxKey = Object.keys(wordFrequencies)[0];
  // This variable is assigned to the
  var currentMaxCount = wordFrequencies[currentMaxKey];

  for (var word in wordFrequencies) {
    if (wordFrequencies[word] > currentMaxCount) {
      currentMaxKey = word;
      currentMaxCount = wordFrequencies[word];
    }
  }
  return currentMaxKey;
}