Challenge: analyze a most frequent word program

most-frequent-word.js

function getTokens(rawString) {
  // NB: `.filter(Boolean)` removes any falsy items from an array
  return rawString.toLowerCase().split(/[ ,!.";:-]+/).filter(Boolean).sort();
  //split() splits the paragraph into words using regular expression
}
  
function mostFrequentWord(text) {
  var words = getTokens(text);    //use getTokens to get an array of words from the paragraoh text
  var wordFrequencies = {};       //defing an object to save frequency of every word
  for (var i = 0; i <= words.length; i++) {    //loop to iterate through the array of words
    if (words[i] in wordFrequencies) {
      wordFrequencies[words[i]]++;   //if the current word already exists in the object, increase its frequecy count by 1
    }
    else {
      wordFrequencies[words[i]]=1;   //if the current word doesn't already exists in the object add a new key for that word and set its value to 1
    }
  }
  var currentMaxKey = Object.keys(wordFrequencies)[0];   
  var currentMaxCount = wordFrequencies[currentMaxKey];
  
  for (var word in wordFrequencies) {    //loop to ierate through the object and find the valoue with highest frequency
    if (wordFrequencies[word] > currentMaxCount) {  
      currentMaxKey = word;
      currentMaxCount = wordFrequencies[word];
    }
  }
  return currentMaxKey;     //return that highest frequency key
}