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JavaScript capitalize first letter of words in a sentence

 function titleCase(str) {

  var newarr = str.split(" ");
  console.log(newarr);
  for (let i=0;i<newarr.length;i++)
  {
    var firstChar = newarr[i].charAt(0);
    var upper = firstChar.toUpperCase();
    var newWords = upper+newarr[i].slice(1).toLowerCase();
    newarr[i] = newWords;
  }
  console.log(newarr);
  str = newarr.join(" ");
  console.log(str);
  return str;
}

titleCase("I'm a little tea pot");
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