Coderbyte不正确的测试用例

Question

我正在处理一些JS Coderbyte挑战，即使我让所有测试用例都正确，但它说我弄错了。特别是这个挑战是寻找最长的词。有人有这个问题吗？任何帮助表示赞赏。

function LongestWord(sen) { 
var remove =  sen.replace(/[^a-zA-Z 0-9]+/g,"");
var keep = remove.split(" ");
var hold = 0;
var word = 0;
for(var i = 0; i < keep.length; i++) {
 if(keep[i].length > hold) {
   hold = keep[i].length;
   word = keep[i];
  }
} 
 return word;
}
LongestWord( "a b c dee");




 Ex test cases:

 "I love dogs" should output "love"
 "a confusing /:sentence:/[ this is not!!!!!!!~" should output "confusing"
 "a beautiful sentence^&!" should output "beautiful"
 "a b c dee" should output "dee"