React Native Multiple Choice Questions (MCQs) and Answers

Missing headers in the request

The API server does not allow cross-origin requests

React Native does not support APIs

The request is too large

To manage global state

To handle navigation

To fetch API data

To style components

State, Actions, Reducers, Store

State, Props, Context, Store

Hooks, Reducers, Context, Dispatch

State, Functions, Components, API

To handle API calls

To modify state based on actions

To fetch data from components

To render UI components

react-redux

redux-toolkit

redux-react-native

redux-state

Context API requires reducers, Redux does not

Redux provides a single store, while Context API provides multiple contexts

Redux is built into React Native, while Context API is not

There is no difference

const store = createStore(reducer)

const store = createRedux(reducer)

const store = new ReduxStore(reducer)

const store = configureReduxStore(reducer)

dispatch({ type: "ADD_ITEM", payload: item })

sendAction({ type: "ADD_ITEM", payload: item })

store.setState({ type: "ADD_ITEM" })

updateStore({ type: "ADD_ITEM" })

useSelector(state => state.value)

useRedux(state => state.value)

store.getState().value

state.getRedux()

To modify reducer functions

To handle async actions

To replace the Redux store

To automatically update UI

The initial state is missing

Reducers must return null

Redux does not allow reducers

Redux does not support state updates

The action type is incorrect

Redux is not installed

Reducers cannot modify state

Actions cannot be dispatched in React Native

The reducer is not connected to the store

useSelector cannot read state

Redux does not work with functional components

Redux does not support hooks

To improve user experience

To reduce memory usage

To prevent UI updates

To handle API calls

ReactAnimation

Animated API

Lottie

React Motion

timing

spring

decay

loop

Allows easy animations with minimal code

Improves network performance

Prevents UI re-renders

Requires manual frame updates

new Animated.Value(0)

Animated.createValue(0)

new Animation(0)

useAnimatedValue(0)

Animated.timing(opacity, { toValue: 1, duration: 500 }).start()

Animated.fade(opacity, { duration: 500 })

opacity.animate({ to: 1, time: 500 })

setOpacity(1, { time: 500 })

Animated.sequence([...])

Animated.parallel([...])

Animated.stagger([...])

Animated.together([...])

The animated value is not updated

Animations require Redux

Animations only work with state

React Native does not support animations

It requires enabling UI manager

It only works in React Native 0.70+

Animations are disabled in Android

React Native does not support animations on Android

React DevTools

Redux DevTools

Chrome Debugger

Flipper

Too many re-renders

Excessive use of setState

Inefficient component updates

Large images in memory

Using React.memo

Using useEffect

Using console.log

Using setInterval

Flipper

Redux

Expo

Babel

Debug > Performance Monitor in React DevTools

import Performance from 'react-native-performance'

Use useEffect

Modify App.js

Use ScrollView

Use FlatList with keyExtractor

Render all items at once

Use Redux

Use React.memo

Use useState without updating state

Remove return statements

Use console.log

Corrupted node_modules folder

Incorrect import statements

Invalid Redux setup

Syntax errors in JavaScript code