switch-fn

Write a functional switch statement.

Install

$ npm install --save switch-fn

Usage

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

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

var Switch = require('switch-fn')

var fn = Switch([onZero, onOne])

fn(0)

Fibonacci

var fib = Switch({
  0: (n) => n,
  1: (n) => n,
  default: (n) => fib(n - 1) + fib(n - 2)
});

fib(10) // => 55

License

MIT © Andrew Joslin