Javascript String insert(index, string)

String.prototype.insert = function (index, string) {
  if (index > 0)
    return this.substring(0, index) + string + this.substring(index, this.length);
  else/* w  w w.jav a2 s .  c o  m*/
    return string + this;
};

// Move this into another file then require it.
String.prototype.insert = function (index, string) {
  if (index > 0) {
    return this.substring(0, index) + string + this.substring(index, this.length);
  } else {/*from   w ww . j a v  a 2 s  .c om*/
    return string + this;
  }
};