Nodejs String Padding pad( digits )

Method Source Code

/**//from  ww  w. j a  v a2s  . c o  m
 * Pads a string with prefixed zeros until the requested string length is achieved.
 * @param  {number} digits [description]
 * @return {String|string}        [description]
 */
String.prototype.pad = function( digits ) {
    var x = this;
    while ( x.length < digits ) {
        x = '0' + x;
    }
    return x;
};

Related

1. pad($char, $length)

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

2. 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
   ...
   

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;
   };