Ecosystems:
JavaScript
@masaeedu/do
Summary
General purpose do notation for monads
Usage
const { mdo } = require("@masaeedu/do")
// :: type Monad m = { of: a -> m a, chain: (a -> m b) -> m a -> m b }
// :: Monad []
const Arr = (() => {
// :: a -> [a]
const of = x => [x]
// :: (a -> [b]) -> [a] -> [b]
const chain = amb => ma => ma.reduce((p, a) => [...p, ...amb(a)], [])
return { of, chain }
})()
const computation = mdo(Arr)(({ x, y }) => [
[x, () => [1, 2]],
[y, () => [3, 4]],
() => Arr.of(x * y)
])
console.log(computation) // => [3, 4, 6, 8]
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