Title Case A Sentence - using nested for loops

JavaScript
1

Tell us what’s happening:
I eventually passed this problem using .map etc… however, on my first attempt the code I used (below) returned the correct results but FCC would not pass the challenge. Just wondering if anyone can see why the code will not pass?

Your code so far

function titleCase(str) {
  
  str = str.toLowerCase();
  var arr = str.split(' ');
  
  var newString = "";
  for(var i = 0; i < arr.length; i++){
    for(var j = 0; j < arr[i].length; j++){
      if(j === 0){
        newString += arr[i][j].toUpperCase();
      } else{
        newString += arr[i][j];
      }
    }
    newString += " ";
  }
  
  return newString;
}

titleCase("I'm a little tea pot");

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Your Browser User Agent is: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3210.0 Safari/537.36.

Link to the challenge:

3

Thanks very much! I’ll try to pay more attention to issues like that.