Redux duck utils

utils.js

// Matches the naming convention for functions which select from Redux state
const SELECTOR_NAME_RE = /^get[A-Z]/

/**
 * Creates a function which creates same-named action dispatchers from an object
 * whose function properties are action creators, passing along any arguments.
 * Function properties whose names start with "get" will be ignored, as these
 * are assumed to be selectors by convention.
 * Also makes the dispatch function itself available.
 * (If this was Java, it'd be a class named ActionDispatcherFactoryFactory).
 */
export const createActionDispatchers = (actionCreators) => (dispatch) =>
  Object.keys(actionCreators).reduce((actionDispatchers, name) => {
    let actionCreator = actionCreators[name]
    // Only create dispatchers for non-selector functions - this allows "duck"
    // modules to export action creators, action type constants and selectors
    // as needed while still allowing use of "import *" to import all action
    // creators.
    if (typeof actionCreator == 'function' && !SELECTOR_NAME_RE.test(name)) {
      // An action dispatcher calls the action creator it wraps, passing any
      // given arguments, then calls the Redux store's dispatch() function with
      // the resulting action object.
      actionDispatchers[name] = (...args) => dispatch(actionCreator(...args))
    }
    return actionDispatchers
  }, {dispatch})