Nodejs String Padding Left lpad(len, s)

Method Source Code

String.prototype.lpad = function(len, s) {   
    var a = new Array(this);   
    var n = (len - this.length);   
    for ( var i = 0; i < n; i++) {   
        a.unshift(s);   //  www.java 2  s  . c o  m
    }   
    return a.join("");   
};

Related

1. lpad(character, count)

   String.prototype.lpad = function(character, count) {
     var ch = character || "0";
     var cnt = count || 2;
     var s = "";
     while (s.length < (cnt - this.length)) { s += ch; }
     s = s.substring(0, cnt-this.length);
     return s+this;
   

2. lpad(count, pad)

   String.prototype.lpad = function(count, pad) {
     pad = pad || '0';
     str = this + '';
     return str.length >= count ? str : new Array(count - str.length + 1).join(pad) + str;    
   };
   String.prototype.rpad = function(count, pad) {
     pad = pad || '0';
     str = this + '';
     return str.length >= count ? str : str + new Array(count - str.length + 1).join(pad);    
   ...
   

3. lpad(count, pad)

   String.prototype.lpad = function(count, pad) {
       pad = pad || '0';
       str = this + '';
       return str.length >= count ? str : new Array(count - str.length + 1).join(pad) + str;
   };
   

4. lpad(l)

   String.prototype.lpad = function(l) {
     var s = this;
     while (s.length < l) { s = "0"+s; }
     return s;
   

5. lpad(len, padstr)

   String.prototype.lpad = function(len, padstr) {
     return Array(len + 1 - this.length).join(padstr) + this;
   };
   String.prototype.rpad = function(len, padstr) {
     return this + Array(len + 1 - this.length).join(padstr);
   };
   

6. lpad(length, padString)

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

7. lpad(pSize, pCharPad)

   String.prototype.lpad = function(pSize, pCharPad)
     var str = this;
     var dif = pSize - str.length;
     var ch = String(pCharPad).charAt(0);
     for (; dif>0; dif--) str = ch + str;
     return (str);
   

8. lpad(pad, length)

   function fill(num) {
       return (num == 10 ? '' : '0') + num;
   String.prototype.lpad = function(pad, length) {
       var s = this;
       while (s.length < length) {
           s = pad + s;
       return s;
   ...
   

9. lpad(padLength, padString)

   String.prototype.lpad = function(padLength, padString){
       var s = this;
       while(s.length < padLength)
           s = padString + s;
       return s;