moy-fp/src/Function/converge.js

A functional programming library.

import curry from './curry'
import nAry from './nAry'

/**
 * [(x1, x2, ...) -> a, (x1, x2, ...) -> b, ..., (x1, x2, ...) -> m] -> ((a, b, ..., m) -> n) -> ((x1, x2, ...) -> n)
 */
const converge = curry(
  (fns, after) => nAry(fns.reduce((acc, fn) => Math.max(acc, fn.length), 0), (...args) => after(...fns.map(fn => fn(...args))))
)

export default converge