JS Konami code script

konami.js

//Small konami code script that doesn't uses the usual method of an integer array
//Either run this through a minifier or remove the comments,
//otherwise people can just search for "konami" or variable name combinations
//The string of the konami code itself is almost impossible to find by using search engines.
//Params:
//cb      - required(function), called on complete sequence with all 3 parameters
//check   - optional(function), checks if key presses should be evaluated, called with all 3 parameters.
//single  - optional(bool), if set to something that evaluates to 'true' the secret can only be used once.
(function (cb, check, single) {
	var d = "&&((%'%'BA";
	var i = 0;
	if (typeof(cb) === typeof(function () {})) {
		document.addEventListener("keydown", function (e) {
			if (typeof(check) !== typeof(cb) || check(cb, check, single)) {
				if (i < d.length && d.charCodeAt(i) === e.keyCode) {
					if (++i === d.length) {
						i = 0;
						if (single) {
							d = "";
						}
						cb(cb, check, single);
					}
				} else {
					i = 0;
				}
			}
		});
	}
})(/*PARAMS HERE*/);

//Example of a single use alert box that can only be triggered
//if the document title has been set to a certain value.

//Param 1:
//window.alert.bind(window, "You found it")

//Param 2:
//function () {return document.title === "SECRET";}

//Param 3:
//true

// -- /u/AyrA_ch
//Licensed under MIT