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tsaniel/LICENSE.txt

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Created September 2, 2011 12:17
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Konami Code easter egg
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README.md
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annotated.js
function(
a, // callback function
b // placeholder for key stack
){
document.onkeyup = function(e){
/113302022928$/.test( // check if the latest pressed codes are Konami Code
b += [((e||self.event).keyCode-37)]) // push the code it into the stack
) && a() // callback if pressed Konami Code
}
}
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index.js
function(f,a){document.onkeyup=function(e){/113302022928$/.test(a+=[((e||self.event).keyCode-37)])&&f()}}
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LICENSE.txt
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
Version 2, December 2004
Copyright (C) 2011 YOUR_NAME_HERE <YOUR_URL_HERE>
Everyone is permitted to copy and distribute verbatim or modified
copies of this license document, and changing it is allowed as long
as the name is changed.
DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. You just DO WHAT THE FUCK YOU WANT TO.
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package.json
{
"name": "KonamiCodeEasterEgg",
"description": "The famous Konami Code easter egg.",
"keywords": [
"Konami Code",
"easter egg",
"fun"
]
}
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test.html
<!DOCTYPE html>
<title>Konami Code easter egg</title>
<div>Expected value: <b>Try to press (↑ ↑ ↓ ↓ ← → ← → B A)</b></div>
<div>Actual value: <b id="ret"></b></div>
<script>
// write a small example that shows off the API for your example
// and tests it in one fell swoop.
var myFunction = function(f,a){document.onkeyup=function(e){/113302022928$/.test(a+=[((e||self.event).keyCode-37)])&&f()}};
myFunction(function(){alert('onKonamiCode triggered!')})
</script>
@atk
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atk commented Sep 15, 2011

I take it the correct values for 0x12345678 and 1337 are yet to be determined?

@p01
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p01 commented Sep 18, 2011

Correct.

http://jsbin.com/ofitoj/edit#preview works fine in IE8, Chrome Canary, Opera 12 and Firefox Aurora. I think it's safe to get rid of the self.

@atk
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atk commented Sep 18, 2011

The magic limit is 4294967296, so we'll need to fit the 10 keycodes 38, 38, 40, 40, 37, 37, 39, 39, 65, 66 inside it.

@tsaniel
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Author

tsaniel commented Oct 12, 2011

Thanks to the string coercion with array literal trick, we save another byte.

@plugnburn
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Just 78 bytes:

function(f,a){onkeyup=function(e){/113302022928$/.test(a+=[e.which-37])&&f()}}

@atk
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atk commented Apr 11, 2014

If you set a as 0, you can get away with

function(f,a){document.onkeyup=function(e){(a+=[(e||self.event).keyCode-37])%1e12==113302022928&&f()}}

// as in
(function(f,a){document.onkeyup=function(e){(a+=[(e||self.event).keyCode-37])%1e12==113302022928&&f()}})(callback, 0)

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