actionize.js

/**
 * Converts a map of action keys into redux-dispatchable string values,
 * so you don't have to type the action name a bunch of times.
 *
 * Example:
 *
 * let actions = {
 *     EAT_TACO: null,
 *     EAT_BURRITO: null,
 *
 *     SPECIAL_SAUCE: 'really_its_just_mayo' // you can still specify a name if you want.
 * };
 * actions = actionize(actions, (action) => `texmex/${action}`);
 *
 * actions == {
 *     EAT_TACO: 'texmex/EAT_TACO',
 *     EAT_BURRITO: 'texmex/EAT_BURRITO',
 *     SPECIAL_SAUCE: 'really_its_just_mayo'
 * }
 *
 *
 * @param {Object} actions - Map of action keys to their names or null to generate a name.
 * @param {function} makeAction - Generator function that takes an action key and returns a string to use (i.e. (action) => `prefix/${action}`)
 * @returns compare function for use with Array.prototype.sort
 */
export default (actions, makeAction) => {
  const actionKeys = Object.keys(actions);
  let ret = {};
  actionKeys.forEach((key) => {
    ret[key] = actions[key] || makeAction(key)
  });
  return ret;
};