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

  //The provided function mostFrequentWord takes a single argument, text.
  function mostFrequentWord(text) {

  //Declares a variable, words, and it holds the value of the function getTokens which takes a single argument, text.
  let words = getTokens(text);

  //Another variable declaration, wordFrequencies, and it holds the value of an empty object.
  let wordFrequencies = {};

  //Standard notation for a for loop. It means, start with i at 0, and repeat this loop as long as i is less than words.length, and
  //after every loop, increase i by 1 (i++).
  for (let i = 0; i <= words.length; i++) {

  //If the value of variable, words, at the location i in the array, is in wordFrequencies, found through looping through the         //object, add 1 to the wordFrequencies
    if (words[i] in wordFrequencies) {
      wordFrequencies[words[i]]++;
    }

    //If the value of variable, words, at location i, is NOT found in, wordFrequencies, set the value of wordFrequencies to 1
    else {
      wordFrequencies[words[i]] = 1;
    }
  }

  //Declares a variable, currentMaxKey, and uses the keys method on the on the object prototype of wordFrequencies.
  let currentMaxKey = Object.keys(wordFrequencies)[0];

  //currentMaxCount variable is declared and it holds the value of the variable wordFrequencies taking the argument currentMaxKey
  let currentMaxCount = wordFrequencies[currentMaxKey];

  //for loop where the variable, word, is declared and the wordFrequencies object is looped through looking for that variable.
  for (let word in wordFrequencies) {

  //if statement where if the variable wordFrequencies when passed the argument, word, is greater than the currentMaxCount, perform   //the following block of code.
    if (wordFrequencies[word] > currentMaxCount) {
  //Set the value of currentMaxKey to word.
      currentMaxKey = word;

  //Set the value of currnetMaxCount to wordFrequencies taking the argument, word.
      currentMaxCount = wordFrequencies[word];
    }
  }
  //At last we return the currentMaxKey. The purpose of the function mostFrequentWord is to iterate through objects to
  //return the word used the most throughout the string provided in the function getTokens.
  return currentMaxKey;
}