Ordinal numbers

ordinal.js

function ordinalParse() {
  return /\d{1,2}(st|nd|rd|th)/;
}

function ordinal(number) {
    var b = number % 10,
        output = (~~(number % 100 / 10) === 1) ? 'th' :
        (b === 1) ? 'st' :
        (b === 2) ? 'nd' :
        (b === 3) ? 'rd' : 'th';
    return number + output;
}