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33-byte JS signal implementation
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| // Usage | |
| const foo = signal(); | |
| // subscribe (callback must return a nullish value) | |
| foo(() => console.log("subscriber #1")); | |
| foo(() => console.log("subscriber #2")); | |
| // fire and reset | |
| foo(); // subscriber #1, subscriber #2 | |
| foo(); // nothing |
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| const signal = F=>(f,G=F)=>F=f?_=>f(G?.()):F?.(); // 33 bytes |
const signal = F=>(f,G=F)=>F=typeof f === 'function'?_=>f(G?.()):F?.();
It's impressive that it's so concise, but you might consider rewriting it with readable variable names and comments so people can better understand the code.
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Brilliant!