function findLongestWord(str) {
//i create two different empty arrays, because
  //1. store each word from a string in one array
  //2. store the lengths of each item of the array inside a new array
//i return the largest number from the array which contains the lengths of the previous array
  var arr=[];
  var newarr=[];
  //this stores the words inside the string inside an array
  arr=str.split(" ")
  for (var i=0; i<arr.length; i++){
//this stores the lengths of the words indide the new array
    newarr[i]=arr[i].length;

  }
//this gets the biggest value inside the new array
  return Math.max.apply(null,newarr);
}

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