Store with map

gistfile1.js

class BaseStore {
  constructor(dispatcher) {
    this._dispatcher = dispatcher;
    this._actionMap = this.getActionHandlers();
    this._dispatchToken = this._dispatcher.register(payload => {
      this._actionMap[payload.type](payload);
    });
  }
}

class Store extends BaseStore {
  getActionHandlers() {
    return {
      foo(payload) {
        console.log('foo', payload.bar);
      },
      
      bar(payload) {
        console.log('bar');
      },
    };
  }
}

var MyDispatcher = new Dispatcher();
var MyStore = new FooStore(MyDispatcher);

MyDispatcher.dispatch({type: 'foo', bar: 100});
MyDispatcher.dispatch({type: 'bar'});