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1.0.0 .. main

Author SHA1 Message Date
hexolan 8c64c67c80 feat: expand examples 
fix: library usage
 2026-04-03 19:31:59 +01:00
hexolan fca497ac1e docs: add sequence to readme 2026-04-03 17:55:12 +01:00
8 changed files with 66 additions and 19 deletions
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README.md
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# Konami Code Snippets
The Konami Code (sometimes called the Contra Code) is a cheat code that has appeared in many Konami video games.
The Konami Code (sometimes called the Contra Code) is a cheat code from many Konami video games.
It is now often used as a gag, homage or an easter egg within many products or websites.
> ↑ ↑ ↓ ↓ ← → ← → B A
>
> Up, Up, Down, Down, Left, Right, Left, Right, B, A
Read more about the Konami Code from the associated [Wikipedia entry](https://en.wikipedia.org/wiki/Konami_Code).
## Usage
## 🚀 Usage
### JSDelivr
@@ -16,7 +20,7 @@ You can use this as a library within your web applications.
Version 1.0 (+ hotfixes): <https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets@1.0/src/core.min.js>
Latest Version: <https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets/src/core.min.js>
Latest Version: <https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets@main/src/core.min.js>
#### Example
@@ -25,7 +29,7 @@ Latest Version: <https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets/src/co
<body>
(...content)
<script src="https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets/src/core.min.js" />
<script src="https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets@main/src/core.min.js"></script>
<script>
document.addEventListener("keydown", handleKonami(() => {
@@ -38,9 +42,9 @@ Latest Version: <https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets/src/co
### Direct
An example of direct usage can be seen within the source of [examples/redirect.html](/examples/redirect.html).
An example of direct usage can be seen within the source of [examples/direct-nolib-unminified.html](/examples/direct-nolib-unminified.html).
## License
## 📜 License
The code contained within this repository is released under the [MIT License](/LICENSE.txt).
examples/redirect.html → examples/direct-nolib-unminified.html
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<html>
<head>
<title>Konami Code Snippets: Redirect</title>
<title>Konami Code Snippets: Nolib Usage</title>
</head>
<body>
<p>Enter the code.</p>
<p>Konami Code</p>
<script>
const keySequence = ["ArrowUp", "ArrowUp", "ArrowDown", "ArrowDown", "ArrowLeft", "ArrowRight", "ArrowLeft", "ArrowRight", "b", "a"];
examples/direct-nolib.html
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<html>
<head>
<title>Konami Code Snippets: Direct Usage</title>
</head>
<body>
<p>Konami Code</p>
<script>
const konamiSequence = ["ArrowUp", "ArrowUp", "ArrowDown", "ArrowDown", "ArrowLeft", "ArrowRight", "ArrowLeft", "ArrowRight", "b", "a"]; let konamiStep = 0, handleKonami = callback => e => { konamiSequence[sequenceStep] === e.key ? (konamiStep += 1, konamiStep === konamiSequence.length && (konamiStep = 0, callback())) : konamiStep = 0 };
function konamiCallback() {
window.location.href = `https://github.com/hexolan/konami-code-snippets`;
}
document.addEventListener("keydown", handleKonami(konamiCallback));
</script>
</body>
</html>
examples/index.html
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<html>
<head>
<title>Konami Code Snippets</title>
</head>
<body>
<p>Konami Code - O(1)</p>
<sup>Note: currently just lower case `b` and `a` keys.</sup>
<sup>(as using <code>event.code</code> not deprecated <code>event.keyCode</code>)</sup>
<script src="https://cdn.jsdelivr.net/gh/hexolan/konami-code-snippets@main/src/core.min.js"></script>
<script>
function konamiCallback() {
window.location.href = `https://github.com/hexolan/konami-code-snippets`;
}
document.addEventListener("keydown", handleKonami(konamiCallback));
</script>
</body>
</html>
package.json
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"author": "Declan Teevan <dt@hexolan.com>",
"license": "MIT",
"packageManager": "pnpm@10.33.0",
"dependencies": {
"devDependencies": {
"minify": "^15.2.0"
}
}
pnpm-lock.yaml
Generated
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importers:
.:
dependencies:
devDependencies:
minify:
specifier: ^15.2.0
version: 15.2.0(@emnapi/core@1.9.2)(@emnapi/runtime@1.9.2)
src/core.js
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const keySequence = ["ArrowUp", "ArrowUp", "ArrowDown", "ArrowDown", "ArrowLeft", "ArrowRight", "ArrowLeft", "ArrowRight", "b", "a"];
let sequenceStep = 0;
// SPDX-License-Identifier: MIT
let handleKonami = (e) => (callback) => {
if (keySequence[sequenceStep] === e.key) {
sequenceStep += 1;
const konamiSequence = ["ArrowUp", "ArrowUp", "ArrowDown", "ArrowDown", "ArrowLeft", "ArrowRight", "ArrowLeft", "ArrowRight", "b", "a"];
let konamiStep = 0;
if (sequenceStep === keySequence.length) {
sequenceStep = 0;
let handleKonami = (callback) => (e) => {
if (konamiSequence[sequenceStep] === e.key) {
konamiStep += 1;
if (konamiStep === konamiSequence.length) {
konamiStep = 0;
callback();
}
} else {
sequenceStep = 0;
konamiStep = 0;
}
}
src/core.min.js
Vendored
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const keySequence=["ArrowUp","ArrowUp","ArrowDown","ArrowDown","ArrowLeft","ArrowRight","ArrowLeft","ArrowRight","b","a"];let sequenceStep=0,handleKonami=e=>callback=>{keySequence[sequenceStep]===e.key?(sequenceStep+=1,sequenceStep===keySequence.length&&(sequenceStep=0,callback())):sequenceStep=0};
const konamiSequence=["ArrowUp","ArrowUp","ArrowDown","ArrowDown","ArrowLeft","ArrowRight","ArrowLeft","ArrowRight","b","a"];let konamiStep=0,handleKonami=callback=>e=>{konamiSequence[sequenceStep]===e.key?(konamiStep+=1,konamiStep===konamiSequence.length&&(konamiStep=0,callback())):konamiStep=0};