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January 12, 2024 20:45
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Konami code for typescript
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| export const Konami = (() => { | |
| // up, up, down, down, left, right, left, right, b, a, enter | |
| const SEQUENCE: Array<number> = [ | |
| 38, | |
| 38, | |
| 40, | |
| 40, | |
| 37, | |
| 39, | |
| 37, | |
| 39, | |
| 66, | |
| 65, | |
| 13, | |
| ]; | |
| let head: number = 0; | |
| let isActive: boolean = false; | |
| let callback: Function | undefined; | |
| const start = (cb: Function): void => { | |
| if (isActive) { | |
| return; | |
| } | |
| window.addEventListener("keydown", onKeyDown); | |
| callback = cb; | |
| isActive = true; | |
| }; | |
| const stop = (): void => { | |
| if (!isActive) { | |
| return; | |
| } | |
| isActive = false; | |
| window.removeEventListener("keydown", onKeyDown); | |
| }; | |
| const onKeyDown = (event: any) => { | |
| if (event.keyCode === SEQUENCE[head]) { | |
| head++; | |
| if (head === SEQUENCE.length) { | |
| if (callback instanceof Function) { | |
| callback(); | |
| } | |
| head = 0; | |
| } | |
| } else { | |
| head = 0; | |
| } | |
| }; | |
| return { | |
| start, | |
| stop, | |
| }; | |
| })(); | |
| // how to call it in the application | |
| export const App = () => { | |
| const [konamiActive, setKonamiActive] = useState(false); | |
| useEffect(() => { | |
| console.log(konamiActive) | |
| Konami.start(() => { | |
| setKonamiActive((currValue) => !currValue); | |
| }); | |
| },[konamiActive]) | |
| return ( | |
| <> | |
| // make <KonamiBackground/> as one component for screen show of konamicode | |
| {konamiActive && <KonamiBackground/>} | |
| </> | |
| ); | |
| } | |
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