Javascript: Pad string but don't truncate if too long

pad.js

// Javascript Pad String
//   Inspired by http://dev.enekoalonso.com/2010/07/20/little-tricks-string-padding-in-javascript/

function pad(filling, value) {
	if (('' + value).length > filling.length) {
		return value;
	}
	return (filling + value).slice(-1 * filling.length);
}

console.log(pad('0000000000', 123456789));
console.log(pad('xx', 'monkey'));