Action creators + combineReducers

What is an action creator?

• It is a string describing what action is to be performed.

• It is a function that creates and returns a particular action object.

• Action object itself is the action creator

• None of the above

Why should we use an action creator?

• To avoid the effort of typing the action object every time we want to dispatch an action.

• To prevent potential bugs that might occur due to a typo while passing an action object to dispatch().

• To have a consistent approach for creating action objects.

• All of the above

Once an action creator is defined, how can we use it to dispatch an action?

• No need to do anything explicitly, React will implicitly pass the required action creator to dispatch().

• Pass the action object returned by the action creator, to the dispatch()

• Pass the action creator function itself to dispatch()

• None of the above

In “createStore.js”, what is the default value of state?

• null

• undefined

• NaN

• None of the above

Initialization of state will happen when the state changes and not during the initial render. To overcome this we use a dummy dispatch with an empty object.

• True

• False

How do you use combineReducers to create a root reducer?

• Pass an array of reducers to combineReducers()

• Pass the reducer with the most lines of code to combineReducers()

• Pass an object whose values are different reducing functions, to combineReducers()

• None of the above

In our Todo application, what does the format/shape of the global state object look like, once it is constructed by combineReducers()?

• { isDarkMode: value-of-isDarkMode, filterStatus: value-of-filterStatus }

• { “preferencesReducer”: { isDarkMode: value-of-isDarkMode }, “todoReducer”: { filterStatus: value-of-filterStatus } }

• [{ isDarkMode: value-of-isDarkMode }, { filterStatus: value-of-filterStatus }]

• None of the above