# concat-map

> concatenative mapdashery

Latest version **0.0.2** (published 2022-10-12) · MIT license · 0 weekly downloads

> **Native alternative:** Array.prototype.flatMap — Use native JavaScript (Node 11.0.0+) (https://developer.mozilla.orgGlobal_Objects/Array/flatMap)

## Install

```sh
npm install concat-map
pnpm add concat-map
yarn add concat-map
bun add concat-map
```

## Health

**Score 23/100 (F)** — status: abandoned.

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

Warnings: low downloads; no esm support; pre 1.0.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 0.0.2 |
| Published | 2022-10-12 |
| First published | 2012-06-08 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | separate (@types/concat-map) |
| Module format | CommonJS |
| Dependencies | 0 |
| Unpacked size | 11.2 KB |
| Known vulnerabilities | 0 |
| Install scripts | no |
| Author | James Halliday |
| Maintainers | substack, ljharb, nopersonsmodules |
| Keywords | concat, concatMap, map, functional, higher-order |

## Links

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

## Recent versions

- 0.0.2 (latest) — 2022-10-12
- 0.0.1 — 2014-01-30
- 0.0.0 — 2012-06-08

## README

# concat-map <sup>[![Version Badge][npm-version-svg]][package-url]</sup>

[![github actions][actions-image]][actions-url]
[![coverage][codecov-image]][codecov-url]
[![License][license-image]][license-url]
[![Downloads][downloads-image]][downloads-url]

[![npm badge][npm-badge-png]][package-url]

Concatenative mapdashery.

## example

``` js
var concatMap = require('concat-map');
var xs = [ 1, 2, 3, 4, 5, 6 ];
var ys = concatMap(xs, function (x) {
    return x % 2 ? [ x - 0.1, x, x + 0.1 ] : [];
});
console.dir(ys);
```


```js
[ 0.9, 1, 1.1, 2.9, 3, 3.1, 4.9, 5, 5.1 ]
```

## methods

```js
var concatMap = require('concat-map')
```

concatMap(xs, fn)
-----------------

Return an array of concatenated elements by calling `fn(x, i)` for each element
`x` and each index `i` in the array `xs`.

When `fn(x, i)` returns an array, its result will be concatenated with the
result array. If `fn(x, i)` returns anything else, that value will be pushed
onto the end of the result array.

## install

With [npm](http://npmjs.org) do:

```sh
npm install concat-map
```

## license

MIT

## notes

This module was written while sitting high above the ground in a tree.

[package-url]: https://npmjs.org/package/concat-map
[npm-version-svg]: https://versionbadg.es/ljharb/concat-map.svg
[deps-svg]: https://david-dm.org/ljharb/concat-map.svg
[deps-url]: https://david-dm.org/ljharb/concat-map
[dev-deps-svg]: https://david-dm.org/ljharb/concat-map/dev-status.svg
[dev-deps-url]: https://david-dm.org/ljharb/concat-map#info=devDependencies
[npm-badge-png]: https://nodei.co/npm/concat-map.png?downloads=true&stars=true
[license-image]: https://img.shields.io/npm/l/concat-map.svg
[license-url]: LICENSE
[downloads-image]: https://img.shields.io/npm/dm/concat-map.svg
[downloads-url]: https://npm-stat.com/charts.html?package=concat-map
[codecov-image]: https://codecov.io/gh/ljharb/concat-map/branch/main/graphs/badge.svg
[codecov-url]: https://app.codecov.io/gh/ljharb/concat-map/
[actions-image]: https://img.shields.io/endpoint?url=https://github-actions-badge-u3jn4tfpocch.runkit.sh/ljharb/concat-map
[actions-url]: https://github.com/ljharb/concat-map/actions

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