Nodejs Utililty Methods String Padding Left

String.prototype.padLeft = function (pad, len)
  if (typeof(len) == "undefined") { var len = 0; }
  if (typeof(pad) == "undefined") { var pad = ' '; }
  if (len + 1 >= this.length)
      str = Array(len + 1 - this.length).join(pad) + this;
    return str;
...

String.prototype.padLeft = function(padString,length){
    var str = this;
    while (str.length < length)
        str = padString + str;
    return str;

String.prototype.padLeft = function (paddingValue) {
  return String(paddingValue + this).slice(-paddingValue.length);
};

String.prototype.padLeft = function (size, char) {
    if (size === 0) {
        return '';
    return (Array(size + 1).join(char) + this).slice(-size);
};

(function(){
String.prototype.padLeft = function(size, prefix) {
    prefix = prefix || " ";
    var s = ''+this;
    while (s.length < size) s = prefix + s;
    return s;
};
Math.randInt = function(min, max){
  return Math.floor(Math.random() * (max - min + 1)) + min;
...

String.prototype.padLeft = function (totalLength, value) {
  if (this.length >= totalLength)
    return this;
  var str = this;
  while (str.length < totalLength)
    str = value + str;
  return str;
};

'use strict';
String.prototype.padl = function(ch, len) {
    var s = this;
    while (s.length < len) {
        s = ch + s;
    return s;
};

String.prototype.padl = function(ch, len) {
    var s = this;
    while (s.length < len) {
        s = ch + s;
    return s;
};

String.prototype.paddingLeft = function(paddingValue)
  return String(paddingValue + this).slice(-paddingValue.length);
};

String.prototype.leftPad = function (character, totalLength) {
    var s = this;
    while (s.length < totalLength)
        s = character + s;
    return s;