Formatter for numbers like 1st, 2nd, 3rd, 4th, etc (Ordinal Number Suffix)

js-ordinal-number-suffix.js

var ons = function (n) {return n < 11 || n > 13 ? ['st', 'nd', 'rd', 'th'][Math.min((n - 1) % 10, 3)] : 'th'};
for(var i=1; i <= 100; i++){ console.log(i + '' + ons(i)); }