Created
September 5, 2022 02:16
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[ecmascript] timeout promise and inverval async iterator
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export const timeout = (msec, ...args) => new Promise(f => setTimeout(f, msec, args)); | |
export const interval = (msec, ...args) => ({ | |
[Symbol.asyncIterator]() { | |
const rs = []; | |
const id = setInterval(() => rs.shift()?.call(undefined, {value: args, done: false}), msec); | |
return { | |
next() { | |
return new Promise(f => rs.push(f)); | |
}, | |
throw() { | |
//console.info("throw"); | |
clearInterval(id); | |
return {value: args, done: true}; | |
}, | |
return() { | |
//console.info("return"); | |
clearInterval(id); | |
return {value: args, done: true}; | |
}, | |
}; | |
} | |
}); | |
if (import.meta.main) (async function example() { | |
console.log(...await timeout(100, "hello")); | |
let i = 0; | |
for await (const v of interval(500, "world")) { | |
if (i++ == 5) break; | |
console.log(...v); | |
} | |
})().catch(console.error); |
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