mattbierner/akh-cont

Akh continuation monad and monad transformer

Continuation monad and monad transformer for Akh Javascript Monad Transformer Library

The continuation transformer ContT layers continuation control over a monad. The base type Cont, provides continuation control on its own. The continuation transformer is a monad, functor, and applicative functor.

# To use as standalone package
$ npm install --save akh.cont

# To use as part of akh library
$ npm install --save akh

Usage

The cont monad/transformer implements the Fantasy Land monad, function, and applicative functor interfaces.

// Continuation monad
require('akh.cont').Cont
require('akh').Cont

// Continuation monad transformer
require('akh.cont').ContT
require('akh').ContT

Cont.runCont(m, k), m.run(k)

Perform a continuation computation m and complete with outer continuation k.

const Cont = require('akh.cont').Cont

const c = Cont.of(3)
    .callcc(k =>
        k(4).map(x => x + 1))
    .map((x) => -x)

Cont.run(c, console.log) // logs: -4
c.run(console.log)

ContT.run(m, k), t.run(k)

Same as Cont.runCont but for transformed types.

Cont.callcc(f)

Reify the current continuation and pass it to f. f can invoke the continuation with a computation to continue execution, or return a computation directly to abort without calling the continuation. f may also capture the continuation k and invoke it multiple times with different values.

ContT.callcc(m, k)

Same as Cont.callcc but for transformed types

Contributing

Contributions are welcome.

To get started:

$ cd akh-cont
$ npm install # install dev packages
$ npm test # run tests