What is Dart in Flutter: Explained Simply

In Flutter, Dart is the programming language used to write apps. It is designed to be fast, easy to learn, and works well with Flutter's UI toolkit to create smooth, native mobile apps.

How It Works

Dart is like the language you use to tell Flutter what to show on the screen and how the app should behave. Think of Dart as the script for a play, and Flutter as the stage and actors that bring the story to life. Dart code describes the app’s layout, colors, buttons, and how users interact with it.

Dart compiles into fast machine code that runs directly on your phone, making apps smooth and responsive. It also supports a feature called 'hot reload' which lets developers see changes instantly without restarting the app, speeding up development.

Example

This simple Dart code creates a Flutter app that shows a centered text message on the screen.

dart

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: Scaffold(
        body: Center(
          child: Text('Hello from Dart in Flutter!'),
        ),
      ),
    );
  }
}

Output

A mobile app screen with white background and centered text: "Hello from Dart in Flutter!"

When to Use

Use Dart when building Flutter apps for Android, iOS, web, or desktop. Dart is the official language for Flutter, so all Flutter apps require Dart code. It is ideal when you want to create fast, beautiful, and cross-platform apps from a single codebase.

For example, if you want to build a new mobile app that works on both iPhones and Android phones without writing separate code for each, Dart with Flutter is a great choice.

Key Points

• Dart is the programming language used by Flutter.
• It compiles to fast native code for smooth app performance.
• Dart supports hot reload for quick development.
• Flutter uses Dart to build cross-platform apps from one codebase.

Key Takeaways

Dart is the main language used to write Flutter apps.

It compiles to fast native code for smooth app performance.

Dart’s hot reload feature speeds up app development.

Flutter and Dart together enable cross-platform app building.

Learning Dart is essential to creating Flutter apps.