moy-fp/src/Functor/chain.js

A functional programming library.

import curry from '../Function/curry'

/**
 * Functor f => (a -> f b) -> f a -> f b
 */
const chain = curry(
  (fn, F) => Object.prototype.toString.call(F) === '[object Array]' ?
    F.reduce(
      (acc, cur) => acc.concat(fn(cur)),
      [],
    ):
    F.chain(fn)
)

export default chain