React Quiz - Tutorialswebsite

React is a JavaScript library for building user interfaces. Test your knowledge with this React quiz made especially for beginners.

Results

#1. React is mainly for building ___

Database

Connectivity

User interface

Design Platform

#2. JSX is necessary to work with React.js?

False

True

#3. Reactjs data flow implementation?

one way data flow

Two way data flow

#4. Which helps react for keeping their data unidirectional?

JSX

Flux

Props

Dom

#5. React.js Covers only the view layer of the app?

False

True

#6. Which is used to keep the value of components unique?

Ref

Key

store

Data

#7. Which of the following API is necessary for React.js component?

State

RenderComponent

Render

Props

#8. Which is used to update the state?

setState

setInitialnumber

setnumber

setNewnumber

#9. Which of the following mounting methods are invoked before the component is inserted into DOM?

getInitialState, componentWillMount

componentWillMount

getInitialState

getInitialState, componentDidMount

#10. ReactJS renders Components start with?

Variable

Uppercase

Lowercase

curly brackets

#11. A parent component could access or read its children components properties?

False

True

#12. which of the following method define default values for properties using props?

getPropsValue

getInitialState

getWillState

getDefaultProps

#13. Which is used to pass the data from parent to child?

state

Components

render

props

#14. To achieve dynamic UI updates. Which of the following needs to be updated ?

props

state

renderComponent

render

#15. Which of the following represented the Pre and post life cycle methods of components ?

Will, Did

getInitialState, componentWillMount

Before, After

Mounting, Unmounting

#16. Which of the following is the correct data flow sequence of flux concept?

Action->Dispatcher->View->Store

Dispatcher->Action->Store->View

Action->Store->Dispatcher->View

Action->Dispatcher->Store->View

#17. React.s focuses on which of the following part when considering MVC?

No one

#18. Which of the following is not components of Redux?

Action

Reducer

State

View

#19. In component lifecycle which one is executed before rendering?

componentDidMount

componentWillMount

shouldComponentUpdate

componentWillReceiveProps

#20. Once you create an element, React you can’t change its children or attributes?

True

False

#21. Life cycle methods of a components fall under following categories?

Mounting, Updating, Unmounting

Mounting, Unmounting

Mounting, Updating

None of these

#22. What is the name of React.js Developer ?

Jordan Lee

Jordan mike

Jordan Walke

Tim Lee

#23. Who Develop React.js?

Google

Facebook

Twitter

microsoft

#24. What is ReactJS?

Server-side Framework

User-interface framework

Both

None

#25. How can you access the state of a component from inside of a member function?

this.getState()

this.prototype.stateValue

this.state

this.values

#26. Props are __________ into other components

A. Injected

B. Methods

Both A and B

All of these

#27. Which of the following API is a MUST for every ReactJS component?

getInitialState

render

renderComponent

None

#28. What are the advantages of React JS?

React can be used on client and as well as server side too

Using React increases readability and makes maintainability easier. Component, Data patterns improves readability and thus makes it easier for manitaining larger apps

React can be used with any other framework (Backbone.js, Angular.js) as it is only a view layer

All of the above

#29. What does the “webpack” command do?

Transpiles all the Javascript down into one file

Runs react local development server

Both

#30. What is a react.js in MVC?

Model

View

Controller

Router

Finish