function longestWord(string) { var str = string.split(\" \"); var longest = 0; var word = null; for (var i = 0; i < str.length - 1; i++) {
This seems to be the easiest way to do this.
function longestWord(string) { var str = string.split(" "); var longest = 0; var word = null; str.forEach(function(str) { if (longest < str.length) { longest = str.length; word = str; } }); return word;
}