# afterfn

> Invoke a function after a function.

Latest version **2.1.1** (published 2014-08-19) · MIT license · 0 weekly downloads

## Install

```sh
npm install afterfn
pnpm add afterfn
yarn add afterfn
bun add afterfn
```

## Health

**Score 15/100 (F)** — status: abandoned.

Positive: no vulnerabilities.

Warnings: low downloads; no types; no esm support.

Negative: abandoned; low maintenance score.

## Facts

| | |
|---|---|
| Version | 2.1.1 |
| Published | 2014-08-19 |
| First published | 2014-06-17 |
| Weekly downloads | 0 |
| License | MIT |
| TypeScript types | none |
| Module format | CommonJS |
| Dependencies | 1 |
| Known vulnerabilities | 0 |
| Install scripts | no |
| GitHub stars | 7 |
| Author | Tim Oxley |
| Maintainers | timoxley |
| Keywords | aspect, aop, functional, oriented |

## Links

- npm: https://www.npmjs.com/package/afterfn
- Repository: https://github.com/timoxley/afterfn
- Issues: https://github.com/timoxley/afterfn/issues
- npm.io page: https://npm.io/package/afterfn

## Dependencies (1)

- [sliced](https://npm.io/package/sliced.md) 0.0.5

## Recent versions

- 2.1.1 (latest) — 2014-08-19
- 2.1.0 — 2014-07-09
- 2.0.0 — 2014-06-17
- 1.0.0 — 2014-06-17

## README

# afterfn

#### Execute a function after given function.

`afterfn` Simply executes after the function is called.
`afterfn.return` Allows manipulation of return value.

## Examples

```js
function doubleNumber(x) {
  return x * 2
}

// calls 'Math.abs' after 'doubleNumber'
// after.return allows manipulation of return value
var doubleNumberAbs = after.return(doubleNumber, Math.abs)

var calledWith = []
var results = []

doubleNumberAbs = after(doubleNumberAbs, function fn() {
  calledWith = calledWith.concat(fn.args)
  results = results.concat(fn.value)
  // after ignores return value of after function.
})

console.log(doubleNumberAbs(10)) // => 20
console.log(doubleNumberAbs(-10)) // => 20
console.log(doubleNumberAbs(-100)) // => 200

console.log(calledWith) // => [ 10, -10, -100 ]
console.log(results) // => [ 20, 20, 200 ]
```

```js
var myPackage = {
  name: 'my-package',
  version: 1,
  build: function() {
    // build routine
  },
  bumpVersion: function() {
    this.version++
  }
}

// always calls 'myPackage.build' *after* 'myPackage.bumpVersion'
myPackage.build = after(myPackage.build, myPackage.bumpVersion)

console.log('%s@v%s', myPackage.name, myPackage.version) // => my-package@v1
myPackage.build()
console.log('%s@v%s', myPackage.name, myPackage.version) // => my-package@v2

```

## Facts

* `afterfn` returns a new Function.
* `afterfn` ignores return value of after function
* `afterfn.return` allows manipulation of return value
* Original return value will be passed as the first argument to the after function.
* Original arguments will be passed as the second argument to the after function.
* Original function will be passed as the third argument to the after function.
* Original function `this` context is maintained.
* Properties and prototype are inherited though function arity will not be preserved.

## See Also

* [timoxley/beforefn](http://github.com/timoxley/beforefn)
* [timoxley/guardfn](http://github.com/timoxley/guardfn)

## License

MIT

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