Redux

basic-example.js

      var reducer = (state = {}, action) => {
        switch action.type {
          case "CUSTOM_ACTION":
            return merge({}, state, {value: action.value});
          default:
            state
        }
      }

      var store = Redux.createStore(reducer);

      store.subscribe((state) => console.log(state));

      store.dispatch({value: "fire"});
      
      // Inside the store calls:
      //   state = reducer(state, action);
      //   toSubscribers(state)