Pads an integer with leading zeros

padInteger.js

/*
  padInteger
    Pads an integer with leading zeros
  parameters
    n (integer) - Integer to be padded
    width (integer) - Padding width
    z (string) - Character to pad integer with, default is '0'
 */
function padInteger(n, width, z) {
  z = z || '0';
  n = n + '';

  return n.length >= width ? n : new Array(width - n.length + 1).join(z) + n;
}