freeCodeCamp Challenge Guide: Title Case a Sentence

@xavi5 wrote:

My solution seems to be valid, why isn’t it working?

var string=[];
function titleCase(str) 
{ 
  str=str.toLowerCase().split(' ');
  for(var a=0;a<=str.length-1;a++)
  {
    string.push(str[a][0].toUpperCase());
    for(var i=1;i<str[a].length;i++)
    {
      string.push(str[a][i]);
    }
    string.push(" ");
  }
  return string.join('');
}

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