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React MCQ

Last Updated: Jan 08, 2024

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ReactJS is a JavaScript library originally developed by Facebook.
it helps in building highly engaging single-page web apps.
react JS helps in breaking down the complex into simpler components.
NPX: It is an npm package that is expected to be done only once in a project.
Folder structure:
- Readme.md: it is used to generate an HTML summary.
- .gitignore: files that you do not want to push in GitHub.
- public/index.html: HTML file of our react app. This is the page that will be loaded on starting the application.
- src/index.js: JS File corresponding to index.html file.
- src/app.js: The main component of any react app. it acts as a container for all other components.
- src/ app.css : Hills in injection styling in react app
JSX: it allows to write HTML in JavaScript and place them in DOM without any child() or createElement() method.
Components in react:
- they are nothing but reusable JavaScript function
- even if the component does not depend on each other, they merge inside a parent component to produce the final UI.
Benefits:
- allows reusability of code
- makes it easier to find a tailor

React MCQs

duplicate key error

repetitive output happiness on the screen

nothing happens

stackoverflow error

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Real-Life Problems

Prep for Target Roles

Custom Plan Duration

Flexible Plans

Create My Plan

True

False

ReactDOM_render()

render()

render_DOM()

DOM_HTML()

preventDefault()

avoidDefault()

revokeDefault()

None of the above

Learn via our Video Courses

Elements

Props

Keys

Ref

it will be rendered as enabled

it will be rendered as disabled

it will not be rendered at all

None of the above

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Real-world coding challenges for top company interviews

Real-world coding challenges for top companies

Real-Life Problems

Detailed reports

JavaScript compiler

JavaScript interpreter

JavaScript transpiler

None of the above

Database

Connectivity

User interface

Design platform

Server-side framework

user interface framework

both a and b

none of the above

Runs react local development server

transfer files all the JavaScript down into one file

a module blunder

none of the above

React.lazy

React.memo

React.fallback

React.split

When we want to replace redux

when we want to break our production app

when we want to improve performance

none of the above

True

False

Apple

Facebook

Google

Twitter

services and components

State and props

state and services

state and component

this.setState()

this.state()

this.setChangeState()

None of the above

Virtual DOM

Original DOM

Both A and B

None of the above

<h1>${fetch()}</h1>

<h1>{fetch}</h1>

<h1>${fetch}</h1>

<h1>{fetch()}</h1>

this.prototype.stateValue

this,getState()

this.values

this.state

3000

3306

3030

8080

Imperative

Integrated

Declarative

closed

Jordan Mike

Jordan Walke

Tim Lee

Jordan Lee

to bind the function

to call a function

to directly access the DOM node

to refer to another JS file

To complete the update

to optimize for all devices

To change the layout of the screen

when you need the browser to paint before the effectors

renderComponent

SetinitialComponent

Render

All of the above

DOM

Flux

JSX

Props

Factory

Render

Class

props

Inherits

Extends

Create

this

componentDidUpdate

componentDidMount

willComponentUpdate

shouldComponentUpdate

Action -> Dispatcher -> Store -> View

Action -> Dispatcher -> View -> Store

Action -> Store -> View -> Dispatcher

Dispatcher -> Action -> Store -> View

source of truth can be anything

source of truth is a component state

source of truth is DOM

none of the above

Access the previous state before the setState operation.

invoke code after the setState operation is done

replace this date completely instead of the default merge actionnone of the above

none of the above

Sinon

Chai

Jest

Mocha

ReactDOM.createPortal()

ReactDOM.hydrate()

ReactDOM.destroy()

ReactDOM.findDOMNode()

this()

super()

iniherits()

self()

ECMA 6

ECMAJavaScript 6

ECMAScript 6

EJavaScript 6

The internal storage of the component

External storage of the component

Permanent storage

All of the above

npm install create-react-app

npm install -g create-react-app

install -g create-react-app

None of the above

Render with arguments

setState

PropTypes

props

Props

Elements

Components

None of the above

Model

Controller

View

Middleware

Unique among his siblings only

unique in the DOM

Does not requires to be unique

all of the above

vendor/js/components/

components/js

js/components

vendor/components

Python

JavaScript

Java

PHP

Javascript XML

JSON XML

JSON

Javascript and AngularJS

JavaScript framework

JavaScript library

both a and b

none of the above

True

False

True

False