how to find length of string in javascript without using length method

1function strLength(s) {
2  var length = 0;
3  while (s[length] !== undefined){
4    length++;
5  } 
6  return length;
7}
8
9console.log(strLength("Hello")); // 5
10console.log(strLength("")); // 0

1var str = new Array(len + 1).join( character );