Getting length of longest word in a string in jvaascript

function findLongestWord(str) {
  return str.split(' ').sort(function(a, b){ return a.length - b.length;}).pop().length;
}

findLongestWord("The quick brown fox jumped over the lazy dog");
findLongestWord("What if we try a super-long word such as otorhinolaryngology") ;
findLongestWord("What is the average airspeed velocity of an unladen swallow");
findLongestWord("Google do a barrel roll");
findLongestWord("May the force be with you");
findLongestWord("The quick brown fox jumped over the lazy dog");