Find the longest word in a phase

gistfile1.js

// Write a function findLongestWord() that takes an array of words and returns the length of the longest one.
// woops, didn't read it.... I took a phase turned it into a array... 

var longestWord = "";

function findLongestWord(phase) {
  var sentence = phase.split(/\s/);
  for ( var i = 0; i < sentence.length; i++ ) {
    if (sentence[i].length > longestWord.length) {
      longestWord = longestWord.replace(longestWord, sentence[i]);
    }
  }
  return longestWord;
}

console.log(findLongestWord("find the longest word in this phase"));
var biggestWord = 'longest'
console.log(biggestWord === longestWord)