findLongestWord.js

function findLongestWord(str) {
  var SplittedArr = str.split(' ');
  var longestWord = SplittedArr[0].length; //initiated longestWord with the first element's length of the array
  for (i = 1; i < SplittedArr.length; i++) {  
    if (SplittedArr[i].length > longestWord) {
      longestWord = SplittedArr[i].length;   
      }
  }
  return longestWord; 
}

findLongestWord("The quick brown fox jumped over the lazy dog");