Nodejs String Padding pad(l, r)

Method Source Code

// Copyright (c) 2013-2014, Jeffrey Wilcke. All rights reserved.
////from   ww w.ja  v  a  2s.co  m
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
// MA 02110-1301  USA

String.prototype.pad = function(l, r) {
   if (r === undefined) {
      r = l
      if (!(this.substr(0, 2) == "0x" || /^\d+$/.test(this)))
         l = 0
   }
   var ret = this.bin();
   while (ret.length < l)
      ret = "\0" + ret
   while (ret.length < r)
      ret = ret + "\0"
   return ret;
}

Related

1. pad( digits )

   String.prototype.pad = function( digits ) {
       var x = this;
       while ( x.length < digits ) {
           x = '0' + x;
       return x;
   };
   

2. pad($char, $length)

   String.prototype.pad = function($char, $length) {
       var $result = this;
       while ($result.length < $length) {
           $result = $char + $result;
       return $result;
   

3. pad(l, r)

   String.prototype.pad = function(l, r) {
     if (r === undefined) {
       r = l
       if (!(this.substr(0, 2) == "0x" || /^\d+$/.test(this)))
         l = 0
     var ret = this.bin();
     while (ret.length < l)
       ret = "\0" + ret
   ...
   

4. pad(l, s, t)

   String.prototype.pad = function(l, s, t){
     return s || (s = " "), (l -= this.length) > 0 ? (s = new Array(Math.ceil(l / s.length)
       + 1).join(s)).substr(0, t = !t ? l : t == 1 ? 0 : Math.ceil(l / 2))
       + this + s.substr(0, l - t) : this;
   };
   

5. pad(l, s, t)

   String.prototype.pad = function(l, s, t){
       return s || (s = " "), (l -= this.length) > 0 ? (s = new Array(Math.ceil(l / s.length)
           + 1).join(s)).substr(0, t = !t ? l : t == 1 ? 0 : Math.ceil(l / 2))
           + this + s.substr(0, l - t) : this;
   };
   

6. pad(len, character)

   document.addEventListener("DOMContentLoaded", update);
   String.prototype.pad= function(len, character){
       var s = '';
       var character = character || '0';
       var len = (len || 2)-this.length;
       return Array(len).join(character)+this;
   Number.prototype.pad = function(len, character){
     return String(this).pad(len,character);
   ...
   

7. pad(len, str)

   String.prototype.pad = function(len, str){
       var output = this.valueOf();
       while(output.length < len){
           output = str + output;
       return output;
   };