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snippets/runPromisesInSeries.md
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### runPromisesInSeries
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Runs an array of promises in series.
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Use `Array.reduce()` to create a promise chain, where each promise returns the next promise when resolved.
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```js
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const runPromisesInSeries = 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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