17 lines
534 B
Markdown
17 lines
534 B
Markdown
---
|
|
title: runPromisesInSeries
|
|
tags: function,promise,intermediate
|
|
---
|
|
|
|
Runs an array of promises in series.
|
|
|
|
Use `Array.prototype.reduce()` to create a promise chain, where each promise returns the next promise when resolved.
|
|
|
|
```js
|
|
const runPromisesInSeries = ps => ps.reduce((p, next) => p.then(next), Promise.resolve());
|
|
```
|
|
|
|
```js
|
|
const delay = d => new Promise(r => setTimeout(r, d));
|
|
runPromisesInSeries([() => delay(1000), () => delay(2000)]); // Executes each promise sequentially, taking a total of 3 seconds to complete
|
|
``` |