10 lines
451 B
Markdown
10 lines
451 B
Markdown
### Run promises in series
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Run an array of promises in series using `Array.reduce()` by creating a promise chain, where each promise returns the next promise when resolved.
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```js
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const series = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());
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// const delay = (d) => new Promise(r => setTimeout(r, d))
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// series([() => delay(1000), () => delay(2000)]) -> executes each promise sequentially, taking a total of 3 seconds to complete
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```
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