JavaScript turns the first letter of each word in a string to uppercase and the rest to lowercase

Requirements:

Make sure that the first letter of each word in the string is capitalized, and the remainder is lowercase.

Here I have written two methods, or one method, and the other is a variant of the method.

The first type:

 
 
function titleCase(str) {
  var newarr,newarr1=[]; 
  newarr = str . toLowerCase() . split(" ");
  for(var i = 0 ; i < newarr . length ; i++){
    newarr1 . push(newarr[i][0] . toUpperCase()+newarr[i] . substring(1));
  }
  return newarr1.join(‘ ‘);
}

titleCase("I‘m a little tea pot");

The first method I think is better understood.

The second (this is based on the first method of the change):

 
function titleCase(str) {
  var newarr,newarr1; 
  newarr =str.toLowerCase().split(" ");
  for(var i=0;i<newarr.length;i++){
    newarr[i] = newarr[i][0].toUpperCase()+newarr[i].substring(1,newarr[i].length));
  }
 newarr1 = newarr.join(" ");
 return newarr1;
}
titleCase("I‘m a little tea pot");

The second method reduces the conversion object, and the principle is the same.

The results of both methods are:

I ' m A Little Tea Pot

PS: If there are deficiencies or errors please point out, must be corrected in time.

JavaScript turns the first letter of each word in a string to uppercase and the rest to lowercase