# p-map-series

> Map over promises serially

Latest version **3.0.0** (published 2021-04-09) · MIT license · 0 weekly downloads

## Install

```sh
npm install p-map-series
pnpm add p-map-series
yarn add p-map-series
bun add p-map-series
```

## Health

**Score 28/100 (F)** — status: abandoned.

Positive: has types package; esm support; no vulnerabilities; high quality score.

Warnings: low downloads.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 3.0.0 |
| Published | 2021-04-09 |
| First published | 2016-10-21 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/p-map-series) |
| Module format | ESM |
| Node | >=12 |
| Dependencies | 0 |
| Unpacked size | 5.2 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 51 |
| Author | Sindre Sorhus |
| Maintainers | sindresorhus |
| Keywords | promise, map, collection, iterable, iterator, fulfilled, serial, serially, async, await, promises, bluebird |

## Links

- npm: https://www.npmjs.com/package/p-map-series
- Repository: https://github.com/sindresorhus/p-map-series
- Homepage: https://github.com/sindresorhus/p-map-series#readme
- Issues: https://github.com/sindresorhus/p-map-series/issues
- Funding: https://github.com/sponsors/sindresorhus
- npm.io page: https://npm.io/package/p-map-series

## Alternatives

- [@commercetools/sync-actions](https://npm.io/package/@commercetools/sync-actions.md) — 25.1K weekly downloads
- [cwait](https://npm.io/package/cwait.md) — 21.4K weekly downloads
- [@ledgerhq/hw-app-cosmos](https://npm.io/package/@ledgerhq/hw-app-cosmos.md) — 4.2K weekly downloads
- [@financial-times/o-loading](https://npm.io/package/@financial-times/o-loading.md) — 2.8K weekly downloads
- [fa](https://npm.io/package/fa.md) — 185 weekly downloads

## Recent versions

- 3.0.0 (latest) — 2021-04-09
- 2.1.0 — 2019-04-03
- 2.0.0 — 2019-03-15
- 1.0.0 — 2016-10-21

## README

# p-map-series

> Map over promises serially

Useful as a side-effect mapper. Use [`p-map`](https://github.com/sindresorhus/p-map) if you don't need side-effects, as it's concurrent.

## Install

```
$ npm install p-map-series
```

## Usage

```js
import pMapSeries from 'p-map-series';

const keywords = [
	getTopKeyword() //=> Promise
	'rainbow',
	'pony'
];

let scores = [];

const mapper = async keyword => {
	const score = await fetchScore(keyword);
	scores.push(score);
	return {keyword, score};
});

console.log(await pMapSeries(keywords, mapper));
/*
[
	{
		keyword: 'unicorn',
		score: 99
	},
	{
		keyword: 'rainbow',
		score: 70
	},
	{
		keyword: 'pony',
		score: 79
	}
]
*/
```

## API

### pMapSeries(input, mapper)

Returns a `Promise` that is fulfilled when all promises in `input` and ones returned from `mapper` are fulfilled, or rejects if any of the promises reject. The fulfilled value is an `Array` of the `mapper` created promises fulfillment values.

#### input

Type: `Iterable<Promise | unknown>`

Mapped over serially in the `mapper` function.

#### mapper(element, index)

Type: `Function`

Expected to return a value. If it's a `Promise`, it's awaited before continuing with the next iteration.

## Related

- [p-each-series](https://github.com/sindresorhus/p-each-series) - Iterate over promises serially
- [p-reduce](https://github.com/sindresorhus/p-reduce) - Reduce a list of values using promises into a promise for a value
- [p-map](https://github.com/sindresorhus/p-map) - Map over promises concurrently
- [More…](https://github.com/sindresorhus/promise-fun)

---

<div align="center">
	<b>
		<a href="https://tidelift.com/subscription/pkg/npm-p-map-series?utm_source=npm-p-map-series&utm_medium=referral&utm_campaign=readme">Get professional support for this package with a Tidelift subscription</a>
	</b>
	<br>
	<sub>
		Tidelift helps make open source sustainable for maintainers while giving companies<br>assurances about security, maintenance, and licensing for their dependencies.
	</sub>
</div>

---
_Source: https://npm.io/package/p-map-series · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._