pad.js

var makeString = require('./helper/makeString');
var strRepeat = require('./helper/strRepeat');

module.exports = function pad(str, length, padStr, type) {
  str = makeString(str);
  length = ~~length;

  var padlen = 0;

  if (!padStr)
    padStr = ' ';
  else if (padStr.length > 1)
    padStr = padStr.charAt(0);

  switch (type) {
  case 'right':
    padlen = length - str.length;
    return str + strRepeat(padStr, padlen);
  case 'both':
    padlen = length - str.length;
    return strRepeat(padStr, Math.ceil(padlen / 2)) + str + strRepeat(padStr, Math.floor(padlen / 2));
  default: // 'left'
    padlen = length - str.length;
    return strRepeat(padStr, padlen) + str;
  }
};