https://github.com/ajoslin/switch-fn

Write a functional switch statement.
https://github.com/ajoslin/switch-fn

Last synced: 17 days ago
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Write a functional switch statement.

• Host: GitHub
• URL: https://github.com/ajoslin/switch-fn
• Owner: ajoslin
• License: mit
• Created: 2016-02-14T21:52:03.000Z (over 8 years ago)
• Default Branch: master
• Last Pushed: 2017-07-25T14:45:25.000Z (over 7 years ago)
• Last Synced: 2024-10-18T21:12:06.159Z (26 days ago)
• Language: JavaScript
• Homepage:
• Size: 6.84 KB
• Stars: 42
• Watchers: 4
• Forks: 3
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md
  • License: license

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README

        
# switch-fn [![Build Status](https://travis-ci.org/ajoslin/switch-fn.svg?branch=master)](https://travis-ci.org/ajoslin/switch-fn)

> Write a functional switch statement.

## Install

```

$ npm install --save switch-fn

```

## Usage

```js

var Switch = require('switch-fn')

var fn = Switch({

  a: actionA,

  b: actionB,

  default: defaultAction

})

var result = fn('a') // => calls actionA with 'a' and gives back actionA's return value

```

## API

#### `Switch(cases)` -> `function`

##### cases

*Required*

Type: `object`

An object, with keys being the 'cases' to match against and values being the function to call in each case.

If no case matching the input is found and a 'default' case is given, it will be used.

# More Examples

#### With a "property getter" for more complicated objects

```js

const Switch = require('switch-fn')

const pipe = require('value-pipe')

const mySwitch = pipe(

  value => value.username.toLowerCase(),

  Switch({

    alice: () => 'hello, alice',

    john: () => 'hello, john'

  })

)

mySwitch({ username: 'Alice' }) // => 'hello, alice'

```

#### Pass in an array for numbers only

```js

var Switch = require('switch-fn')

var fn = Switch([onZero, onOne])

fn(0)

```

#### Fibonacci

```es6

var fib = Switch({

  0: (n) => n,

  1: (n) => n,

  default: (n) => fib(n - 1) + fib(n - 2)

});

fib(10) // => 55

```

## License

MIT © [Andrew Joslin](http://ajoslin.com)