function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
}
// takes a string, converts all to lower case, removes all characters in (), removes falsy items, sorts the array in alphabetical order.

function mostFrequentWord(text)
//this function seems to
{
  let words = getTokens(text);
// declares varaible [words], set equal to function getTokens, with he argument (text).

  let wordFrequencies = {};

  //wordFrequencies = some set.

  for (let i = 0; i <= words.length; i++)

  // this program runs through each item, probably in
  {
    if (words[i] in wordFrequencies) {
      wordFrequencies[words[i]]++;
    }

    //if word number i is in the set wordFrequencies, then add the word to the set wordFrequencies


    else
    {
      wordFrequencies[words[i]] = 1;
    }

  }
  let currentMaxKey = Object.keys(wordFrequencies)[0];

  // set currentMaxKey to take the key of the first key in the object, wordFrequencies.

  let currentMaxCount = wordFrequencies[currentMaxKey];

  //  set currentMaxCount to wordFreuqnecies[currentMaxKey]

  for (let word in wordFrequencies) {
    if (wordFrequencies[word] > currentMaxCount) {
      currentMaxKey = word;
      currentMaxCount = wordFrequencies[word];
    }
    //cycles through every word in wordFrequencies, evaluating whether that wordFrequencies of [word] > currentMaxCount. If so, set it to word, and have the currentMaxCount move up.
  }
  return currentMaxKey;
}