higher-order-reducers/lib/map-by-type.js

A library of simple everyday reducer utility functions

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
var mapByType = function mapByType() {
  var reducers = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : {};

  var reducerKeys = Object.keys(reducers);
  for (var i = 0; i < reducerKeys.length; i += 1) {
    var key = reducerKeys[i];
    if (typeof reducers[key] !== 'function') {
      throw new Error('Key "' + key + '" in mapByType is not a reducer');
    }
  }
  return function (state, action) {
    if (typeof reducers[action.type] === 'undefined') {
      return state;
    }
    return reducers[action.type](state, action);
  };
};

exports.default = mapByType;