redux/src/compose.js

Predictable state container for JavaScript apps

/**
 * Composes single-argument functions from right to left.
 *
 * @param {...Function} funcs The functions to compose.
 * @returns {Function} A function obtained by composing functions from right to
 * left. For example, compose(f, g, h) is identical to arg => f(g(h(arg))).
 */
export default function compose(...funcs) {
  return (...args) => {
    if (funcs.length === 0) {
      return args[0]
    }

    const last = funcs[funcs.length - 1]
    const rest = funcs.slice(0, -1)

    return rest.reduceRight((composed, f) => f(composed), last(...args))
  }
}