Why Why there is no Trim function on JS

It was pretty bad when you find that the JS dos not have a inbuilt function on strings to do Trim. But not to worry. It can be implemented easily.

function LTrim(str){
  var whitespace = new String(" \t\n\r");
  var s = new String(str);
  
  if (whitespace.indexOf(s.charAt(0)) != -1) {
    var j=0, i = s.length;
    while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
      j++;
    s = s.substring(j, i);
  }
  return s;
}

function RTrim(str){
  var whitespace = new String(" \t\n\r");
  var s = new String(str);

  if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
    var i = s.length - 1;
    while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
      i--;
    s = s.substring(0, i+1);
  }
  return s;
}

function Trim(str){
  return RTrim(LTrim(str));
}