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function findLongestWord(str) {
  strArr = str.split(/\b/);
  var longest = 0;
  for(var x = 0; x < strArr.length; x+=1) {
    if (strArr[x].length > longest) {
      longest = strArr[x].length;
    }
  }
  return longest;
}

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