Google

Facebook

Microsoft

Amazon

It directly manipulates the browser's DOM

It creates a virtual DOM in memory

It bypasses DOM manipulation entirely

It uses multiple DOMs simultaneously

Only a web browser

Python and pip

npm and Node.js

Java Development Kit

npm start-react

react create-new

npx create-react-app

node create-react

Update Node.js

Uninstall create-react-app globally

Clear browser cache

Reset npm configurations

react start

start-app

node start

npm start

In the src folder as App.js

In the root directory

In the public folder

In the components folder

Mobile applications only

Desktop applications only

Single-page applications

Operating systems

Digital Object Management

Document Object Model

Data Object Manipulation

Directory Object Manager

var has block scope while const has function scope

Both have identical scope rules

const has block scope while var has function scope

Neither has block scope

It only sorts arrays in ascending order

It creates a copy of the original array without modifications

It executes a function on each array element and returns a new array

It only filters out unwanted elements

It's just a styling preference

It provides additional functionality

class is a reserved keyword in JavaScript

It's required for CSS modules

It creates a new component

It defines where React components will be rendered in the DOM

It initializes state management

It handles routing

The entire object becomes completely immutable

The object reference can't be reassigned, but properties can be modified

Properties can only be read, not modified

The object must remain empty

It can have multiple root elements

It requires exactly two parent elements

It must have one root element or fragment

It can only use div elements

Using [[expression]]

Using {expression}

Using (expression)

Using

They are automatically removed

They must be self-closing with />

They can be left open

They require special attributes

Using switch statements only

Using while loops

Using if statements outside JSX or ternary operators

Using direct if statements inside JSX

To add styling to components

To group elements without adding extra nodes to the DOM

To create reusable components

To handle state management

Arrays cannot be modified at all

Only array length can be changed

Array elements can be modified but not reassigned

Arrays must be converted to let first

A database query language

A testing framework

A syntax extension allowing HTML in JavaScript

A state management system

Always sort the items first

Limit the list to 10 items

Provide a unique key prop for each item

Use indexes as keys always

It only handles CSS rendering

It defines which components to display in the DOM

It's used for data fetching

It only manages state updates

Using semicolons between lines

Wrapping it in parentheses

Using line continuation characters

Adding commas between elements

It has global scope only

It has block scope

It has function scope only

It has no scope restrictions

They are completely separate languages

JSX compiles to regular JavaScript

JSX only works with TypeScript

They cannot be used together

Always using switch statements

Using multiple render methods

Using logical operators or separate components

Only using inline ternary operators

To create new objects

To combine multiple arrays

To extract values from objects and arrays efficiently

To modify object properties

Multiple root nodes are required

The root node serves as the main container for React-managed content

Root nodes cannot be customized

Root nodes must be created dynamically

React Functions

React Components

React Usable Codes

React JSX

React Functions

React Components

Properties

State

Function Component

Class Component

Function Component

Class Component

constructor()

super()

component()

state()