kojima

a small functional/monad library

Usage

Example

import { Option, Some, None, Result, Ok, Err } from 'kojima'

const maybe = Option.of('thing')
maybe.isSome() // true
const isnt = maybe.chain(None).map(_x => 'other') // None
isnt.isSome() // false

const result = Result.of('3:41am')
result.isOk() // true

result.chain(() => Err(new Error(-Infinity)))
    .map(_x => '4:10am')
    .chain(Ok)

result.isErr() // true

// crimes!
None == None() // true