Circulates the given number between the min-, max-boundaries (boundaries included)

Function.circulate.js

/*
Script: Number.circulate.js
	Extension for Mootools Number Native

License:
	MIT-style license.

Copyright:
	Copyright (c) 2009-2010 [Thomas Dullnig](http://thomasdullnig.blogspot.com/).

Code:
	[Thomas Dullnig](http://thomasdullnig.blogspot.com/).

Description:
	Circulates the given number between the min-, max-boundaries (boundaries included)
	Examples may help:
	(11).circulate(5, 10) == 5
	(12).circulate(5, 10) == 6
	(13).circulate(5, 10) == 7
	(14).circulate(5, 10) == 8
	(15).circulate(5, 10) == 9
	(16).circulate(5, 10) == 10
	(17).circulate(5, 10) == 5
	(18).circulate(5, 10) == 6
	and so on...
	
	Same goes for numbers smaller than the min-value:
	(4).circulate(5, 10) == 10
	(3).circulate(5, 10) == 9
	(2).circulate(5, 10) == 8
	and so on...
	
	Even with negative values:
	(-2).circulate(0, 2) == 1
	or
	(3).circulate(-4, -2) == -3
*/

Number.implement({
	'circulate': function(min, max) {
		if (!(this > max || this < min)) {return this;}
		var gap = max - min + 1;
		return (this > max  ? min - 1 + (((this - max) % gap) || gap) : max + 1 - (((min - this) % gap) || gap));
	}
});