Javascript Number ordinal()

Number.prototype.ordinal = function () {
    return this + (
        (this % 10 == 1 && this % 100 != 11) ? 'st' :
        (this % 10 == 2 && this % 100 != 12) ? 'nd' :
        (this % 10 == 3 && this % 100 != 13) ? 'rd' : 'th'
        );/*from  www.  j av a2  s .c o m*/
}

// Return the ordinal of the given number
// (1).ordinal() returns "st" (as in 1st)
// (2).ordinal() returns "nd" (as in 2nd)
Number.prototype.ordinal = function() {
 var s = ["th", "st", "nd", "rd"], v = this % 100;

 return (s[(v - 20) % 10] || s[v] || s[0]);
};