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function findLongestWord(str) {
  var longestWord = str.split(" ");
  var finalWord = 0;
  
  for(var i = 0; i < longestWord.length; i ++){
    if(finalWord < longestWord[i].length){
      finalWord = longestWord[i].length;
    }
  }
  return finalWord;
}

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