AngularJS Ordinal Filter

gistfile1.js

// convert numbers to ordinal versions of themselves
// {{ 1 | ordinal }} : "1st"
// {{ 2 | ordinal }} : "2nd"
// {{ 3 | ordinal }} : "3rd"
// etc.

angular
	.module("app", [])
	.filter("ordinal", function () {
		var suffix = ["th", "st", "nd", "rd"];

		return function (cardinal) {
			var v = cardinal % 100;

			// suffix[(v - 20) % 10]
			//   the teens are weird, so we ignore everything less than 20
			//   for numbers >= 20, we look at the one's digit
			// suffix[v]
			//   this is just 0 - 3. numbers > 3 will be null
			// suffix[0]
			//   3 < n < 20
			return cardinal + (suffix[(v - 20) % 10] || suffix[v] || suffix[0]);
		};
	});