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Redux and Flux: Key Concepts Quiz

The document contains multiple choice questions about Redux concepts like actions, reducers, stores, middleware, and connecting React components. Key points covered include: data flows uni-directionally in Redux from actions to store; reducers are pure functions that take the previous state and an action as input and return a new state; the store holds the application state and provides methods like dispatch, subscribe, and getState; ReactRedux bindings connect React components to the Redux store.

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Tensingh Raja
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10K views3 pages

Redux and Flux: Key Concepts Quiz

The document contains multiple choice questions about Redux concepts like actions, reducers, stores, middleware, and connecting React components. Key points covered include: data flows uni-directionally in Redux from actions to store; reducers are pure functions that take the previous state and an action as input and return a new state; the store holds the application state and provides methods like dispatch, subscribe, and getState; ReactRedux bindings connect React components to the Redux store.

Uploaded by

Tensingh Raja
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as TXT, PDF, TXT or read online on Scribd
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Which of the following is not an implementation of Flux?

Fluxit

Modularity in Redux is achieved through ________________


Reducers

In Redux, state variables and objects are never mutated. Instead, new ones are
produced.
True

The function random() produces a new random number between 0 and 1 every time you
run it. Is this a pure function?
False

Data flow in Redux is:


Uni-Directional

Which of the following is not true about Pure Functions


Can make API calls

In Redux Action Types have to be defined as Strings


True

Which of the following Action Objects are syntactically correct?


{ type: 'ADD_TODO', text }

Actions in Redux
Send data to Store

Which of the following functions can be used to dispatch actions in Redux?


All the options mentioned

Action Creators in Redux


All the options mentioned

What is the input for the dispatch function?


Action Object

Following function is a __________?


(previousState, action) => newState
Reducer

createStore is a function to be imported from ____________


Redux

Which of the following statements about Reducers is not true?


Can make API calls

combineReducers aggregates the output of reducers into a single object representing


application state.
True

Which of the following can be done in a Reducer?


Perform Calculations
Presentational components of React are connected to the container components of
React.
True

State Changes in Redux are stored in such a way that _____________


State changes are stored as new state with references to old state for unchanged
sections of the state tree.

Which of the following can be done inside a reducer?


Call a pure function

What is the helper function that Redux provides for making root reducer?
CombineReducer()

Redux bindings to React are to be imported from ____________.


ReactRedux

How to access Redux state from store?


getState()

One can deregister listeners on store by calling function returned by


_______________.
subscribe(listner)

Which of the following statements about Redux is not true?


Changes are initiated through Actions -- Wrong

Which of the following is not api of redux library


connect()

React bindings for Redux are enabled by default.


False

Which of the following is a signature of a reducer function?


function name(state, action)

How can initial state be passed to store the, using the createStore function?
Pass it as second aurgument

The function double is defined as below. Is this a pure function?


const double = x => x * 2;
True

How is the context of store passed to React components?


Using Provider

Redux applications follow _____________________


Functional Programming

What are middleware used for?


To create new dispatch function

How to register for listeners on store?


subscribe(listener)
Redux can be used with React, AngularJS, BackboneJS and many others.
True

Which components take care of connecting to Redux store for data fetching and state
updates?
Container

How do you bind action creators with dispatch function?


bindActionCreators

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