React Native vs Flutter comparison - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a simple React Native component that displays "Hello World".

React Native

import React from 'react';
import { Text, View } from 'react-native';

export default function App() {
  return (
    <View>
      <[1]>Hello World</[1]>
    </View>
  );
}

Drag options to blanks, or click blank then click option'

AButton

BScrollView

CView

DText

Attempts:

3 left

💡 Hint

Common Mistakes

Using instead of to display text.

Using

The Text component is used to display text in React Native.

2fill in blank

medium

Complete the code to add a button that shows an alert when pressed in React Native.

React Native

import React from 'react';
import { Button, Alert, View } from 'react-native';

export default function App() {
  return (
    <View>
      <Button title="Press me" onPress={() => [1]('Button pressed!')} />
    </View>
  );
}

Drag options to blanks, or click blank then click option'

Aalert

Bconsole.log

CAlert.alert

Dconsole.error

Attempts:

3 left

💡 Hint

Common Mistakes

Using alert which works in web but not recommended in React Native.

Using console.log which only logs to console.

Alert.alert is the correct way to show an alert dialog in React Native.

3fill in blank

hard

Fix the error in the React Native style object to center content vertically and horizontally.

React Native

const styles = {
  container: {
    flex: 1,
    justifyContent: '[1]',
    alignItems: 'center',
  },
};

Drag options to blanks, or click blank then click option'

Acenter

Bleft

Cright

Dflex-start

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'left' or 'right' which are not valid values for justifyContent.

Using 'flex-start' which aligns content to the start, not center.

justifyContent: 'center' centers content vertically in a flex container.

4fill in blank

hard

Fill both blanks to create a Flutter widget that shows a centered text.

React Native

import 'package:flutter/material.dart';

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: [1](
          child: [2]('Hello Flutter!'),
        ),
      ),
    );
  }
}

Drag options to blanks, or click blank then click option'

ACenter

BContainer

CText

DColumn

Attempts:

3 left

💡 Hint

Common Mistakes

Using Container instead of Center for centering.

Using Column which arranges children vertically but does not center by default.

Center widget centers its child, and Text displays text in Flutter.

5fill in blank

hard

Fill all three blanks to create a React Native StyleSheet with a red background and white centered text.

React Native

import { StyleSheet } from 'react-native';

const styles = StyleSheet.create({
  container: {
    backgroundColor: '[1]',
    flex: 1,
    justifyContent: '[2]',
    alignItems: '[3]',
  },
  text: {
    color: 'white',
  },
});

Drag options to blanks, or click blank then click option'

Ablue

Bcenter

Dred

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong color names like 'blue' instead of 'red'.

Mixing up justifyContent and alignItems values.

The container background should be 'red'. Both justifyContent and alignItems set to 'center' center content vertically and horizontally.

Practice

1. Which language does React Native primarily use for building apps?

easy

A. Kotlin

B. Dart

C. JavaScript and JSX

D. Swift

Solution

1. Step 1: Identify React Native's programming language

   React Native uses JavaScript along with JSX syntax to build UI components.

2. Step 2: Compare with other options

   Dart is used by Flutter, Swift and Kotlin are native languages for iOS and Android respectively.

3. Final Answer:

   JavaScript and JSX -> Option C

4. Quick Check:

   React Native = JavaScript and JSX [OK]

Hint: React Native uses JavaScript, Flutter uses Dart [OK]

Common Mistakes:

• Confusing Flutter's Dart with React Native's JavaScript
• Thinking React Native uses native languages like Swift
• Assuming JSX is a separate language

2. Which of the following is the correct way to create a button in Flutter?

easy

A. <TouchableOpacity>Click</TouchableOpacity>

B. Button(title: 'Click')

C. <Button title='Click' />

D. ElevatedButton(onPressed: () {}, child: Text('Click'))

Solution

1. Step 1: Understand Flutter widget syntax

   Flutter uses Dart and widgets like ElevatedButton with named parameters.

2. Step 2: Identify correct button syntax

   ElevatedButton(onPressed: () {}, child: Text('Click')) uses ElevatedButton with onPressed callback and child Text widget, which is correct.

3. Final Answer:

   ElevatedButton(onPressed: () {}, child: Text('Click')) -> Option D

4. Quick Check:

   Flutter buttons use widgets with callbacks [OK]

Hint: Flutter buttons use widgets with onPressed callback [OK]

Common Mistakes:

• Using JSX or HTML-like syntax in Flutter
• Omitting onPressed callback in Flutter button
• Confusing React Native TouchableOpacity with Flutter widgets

3. What will be the output of this React Native code snippet?

import React from 'react';
import { Text, View } from 'react-native';

export default function App() {
  return (
    
      Hello from React Native!
    
  );
}

medium

A. A screen displaying the text: Hello from React Native!

B. A blank screen with no text

C. Syntax error due to missing import

D. App crashes on launch

Solution

1. Step 1: Analyze the React Native component

   The component returns a View containing a Text element with the string 'Hello from React Native!'.

2. Step 2: Understand rendering behavior

   React Native renders the View and Text properly, so the text will appear on screen.

3. Final Answer:

   A screen displaying the text: Hello from React Native! -> Option A

4. Quick Check:

   React Native renders JSX as UI [OK]

Hint: React Native JSX renders UI elements directly [OK]

Common Mistakes:

• Thinking View or Text won't render without styles
• Assuming missing styles cause crash
• Confusing React Native with web React

4. Identify the error in this Flutter code snippet:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Text('Hello Flutter'),
      ),
    );
  }
}

medium

A. Missing @override annotation before build method

B. build method should return a Widget but returns void

C. Missing const keyword before MaterialApp

D. build method lacks override keyword and is missing @override

Solution

1. Step 1: Check Flutter build method requirements

   In Flutter, the build method should have the @override annotation to indicate it overrides a superclass method.

2. Step 2: Identify missing annotation

   The code lacks the @override annotation before the build method, which is a recommended practice to avoid errors.

3. Final Answer:

   Missing @override annotation before build method -> Option A

4. Quick Check:

   Flutter build methods need @override annotation [OK]

Hint: Always add @override before build in Flutter widgets [OK]

Common Mistakes:

• Ignoring missing @override annotation warnings
• Confusing const keyword necessity
• Thinking build returns void instead of Widget

5. You want to build a mobile app with highly customized UI components and smooth animations. Which framework is generally better suited for this need?

hard

A. React Native, because it uses native UI components by default

B. Flutter, because it offers more control over custom UI and animations

C. React Native, because it compiles to native ARM code

D. Flutter, because it uses JavaScript and JSX for UI

Solution

1. Step 1: Understand UI customization capabilities

   Flutter renders its own widgets and provides extensive control over UI and animations, allowing highly customized designs.

2. Step 2: Compare with React Native's approach

   React Native uses native UI components, which can limit deep customization and complex animations compared to Flutter.

3. Final Answer:

   Flutter, because it offers more control over custom UI and animations -> Option B

4. Quick Check:

   Flutter = better custom UI and animations [OK]

Hint: Flutter excels in custom UI and animations [OK]

Common Mistakes:

• Assuming React Native compiles to native ARM code
• Confusing Flutter's language as JavaScript
• Thinking native UI always means better customization