Find the longest word in a sentence

LongestWordFinder.js

function longest(sentence) {
  var sentence_words = sentence.split(' ');

  if (!Array.isArray(sentence_words) || sentence_words.length === 0) return false;

  var longest_word = sentence_words[0];

  for (let i=0; i < sentence_words.length; i++) {
      if (sentence_words[i].trim().length > longest_word.trim().length) {
        longest_word = sentence_words[i];
      }
  }

  return longest_word;
}