coyo.js

const Coyo = (f, v) => ({fn: f, val: v})

const id = x => x

const liftCoyo = a => Coyo(id, a)

const fmap = (fn, coyo) => Coyo(compose(fn, coyo.fn), coyo.val)

const lower = coyo => map(coyo.fn, coyo.val)

const bindCoyo = (fn, coyo) => liftCoyo(chain(compose(lower, coyo.fn, fn), coyo.val))

const apCoyo = (f, g) => liftCoyo(ap(lower(f), lower(g)))

apCoyo(liftCoyo([inc, add(10)]), liftCoyo([1,2,3]))