Nodejs String Padding Left padLeft(ch, n)

Method Source Code

'use strict';// ww  w  . j a  v  a 2s .  co  m

String.prototype.padLeft = function(ch, n) {
  let myString = '';

  while(myString.length < n - this.length) {
    myString += ch;
  }

  myString += this;

  return myString;
};
String.prototype.padRight = function(ch, n) {
  let myString = this;

  while(myString.length < n) {
    myString += ch;
  }

  return myString;
};

console.log('5'.padLeft('0', 5));
console.log('2'.padRight('.', 2));

Related

1. lpad(pad_str, length)

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

2. padL(width, pad)

   String.repeat = function(chr, count) {
     var str = "";
     for (var x = 0; x < count; x++) {
       str += chr;
     return str;
   };
   String.prototype.padL = function(width, pad) {
     if (!width || width < 1)
   ...
   

3. padLeft( length, padding )

   Math.TO_DEGREES = 180 / Math.PI;
   Math.TO_RADIANS = Math.PI / 180;
   String.prototype.padLeft = function( length, padding )
       return Array( length - this.length + 1 ).join( padding || '0' ) + this;
   };
   

4. padLeft( pPadChar, pTotalLength )

   String.prototype.padLeft = function( pPadChar, pTotalLength )
     return ( pTotalLength <= this.length ) ? this :
       ( pPadChar + this ).padLeft(pPadChar, pTotalLength);
   };
   

5. padLeft(c, length)

   String.prototype.padLeft = function(c, length) {
       var str = this;
       while (str.length < length)
           str = c + str;
       return str;
   function formatDuration (duration) {
       var totalSeconds = Math.floor(duration);
       var minutes = Math.floor(totalSeconds / 60);
   ...
   

6. padLeft(ch, n)

   String.prototype.padLeft = function(ch, n) {
     if(this.length < n) {
       var diff = n - this.length;
       var tempArr = this.split('');
       var tmp;
       for(var i = 0; i < diff; i++) {
         tempArr.unshift(ch);
       tmp = tempArr.toString().replace(/,/g, '');
   ...
   

7. padLeft(char, length)

   String.prototype.padLeft = function (char, length) {
       var len = this.length;
       if (len === 0) return '';
       var str = this;
       while (len < length) {
           str = char + str;
           len++;
       return str;
   ...
   

8. padLeft(character, length)

   'use strict';
   String.prototype.padLeft = function (character, length)  {
     return character.repeat(Math.max(0, length - this.length)) + this;
   };
   

9. padLeft(character, length)

   'use strict';
   String.prototype.padLeft = String.prototype.padLeft || function (character, length) {
     return character.repeat(Math.max(0, length - this.length)) + this;
   };