Javascript String fill(str, toLen)

String.prototype.fill = function(str, toLen) {
 if (this.length >= toLen) {
  return this;//from   w w  w  .j a  va 2  s .  co m
 } else {
  str = str || " ";
  var fillLen = toLen - this.length;
  var reps = fillLen / str.length;
  var remainder = fillLen % str.length;
  return str.repeat(reps) + str.substring(0, remainder) + this;
 }
}