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  1. function getTokens(rawString) {
  2.   // NB: `.filter(Boolean)` removes any falsy items from an array
  3.   return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
  4.  }
  5.  
  6.   //The provided function mostFrequentWord takes a single argument, text.
  7.   function mostFrequentWord(text) {
  8.  
  9.   //Declares a variable, words, and it holds the value of the function getTokens which takes a single argument, text.
  10.   let words = getTokens(text);
  11.  
  12.   //Another variable declaration, wordFrequencies, and it holds the value of an empty object.
  13.   let wordFrequencies = {};
  14.  
  15.   //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
  16.   //after every loop, increase i by 1 (i++).
  17.   for (let i = 0; i <= words.length; i++) {
  18.  
  19.   //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
  20.     if (words[i] in wordFrequencies) {
  21.       wordFrequencies[words[i]]++;
  22.     }
  23.    
  24.     //If the value of variable, words, at location i, is NOT found in, wordFrequencies, set the value of wordFrequencies to 1
  25.     else {
  26.       wordFrequencies[words[i]] = 1;
  27.     }
  28.   }
  29.  
  30.   //Declares a variable, currentMaxKey, and uses the keys method on the on the object prototype of wordFrequencies.
  31.   let currentMaxKey = Object.keys(wordFrequencies)[0];
  32.  
  33.   //currentMaxCount variable is declared and it holds the value of the variable wordFrequencies taking the argument currentMaxKey
  34.   let currentMaxCount = wordFrequencies[currentMaxKey];
  35.  
  36.   //for loop where the variable, word, is declared and the wordFrequencies object is looped through looking for that variable.
  37.   for (let word in wordFrequencies) {
  38.  
  39.   //if statement where if the variable wordFrequencies when passed the argument, word, is greater than the currentMaxCount, perform   //the following block of code.
  40.     if (wordFrequencies[word] > currentMaxCount) {
  41.   //Set the value of currentMaxKey to word.
  42.       currentMaxKey = word;
  43.      
  44.   //Set the value of currnetMaxCount to wordFrequencies taking the argument, word.
  45.       currentMaxCount = wordFrequencies[word];
  46.     }
  47.   }
  48.   //At last we return the currentMaxKey. The purpose of the function mostFrequentWord is to iterate through objects to    
  49.   //return the word used the most throughout the string provided in the function getTokens.
  50.   return currentMaxKey;
  51. }
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