Bonfire: Find the Longest Word in a String 找出一句话中最大的单词

function findLongestWord(str) {    var beginArray = str.split(" ");    console.log(beginArray);    var length = 0;    beginArray.map(function(x){        if(length < x.length)        {            length = x.length;        }    });    console.log(length);    return length;}