freeCodeCamp Challenge Guide: Title Case a Sentence

Solution: The online compiler thing does not like it when I place global variables for some reason?

function titleCase(str) 
{
  var string=""; //<----buffer variable
  str=str.toLowerCase().split(' ');
  
  for(a=0;a<=str.length-1;a++)
    {
      string+=str[a][0].toUpperCase();
      for(var b=1;b<str[a].length;b++)
        {
          string+=str[a][b];
        }
      if(a==str.length-1) continue;//
      else string+=' ';            // Do not place a space on a final word
    }
  return string;
}

titleCase("tHe wIZARD oF oZ"); 
//"The Wizard Of Oz"

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