Dart Programming Language Cheatsheet

Dart is a versatile and powerful programming language developed by Google, known for its simplicity, efficiency, and strong support for building cross-platform applications. Whether you are a beginner learning Dart or an experienced developer looking for a quick reference guide, this Dart Cheat Sheet will help you navigate the language and its key features.

1. Variables and Data Types

`var`:

Dart supports type inference using the `var` keyword. The compiler automatically determines the type based on the assigned value.

``````var name = 'Dart';
var age = 25;``````

`int`:

Represents integer values.

``int count = 42;``

`double`:

Represents floating-point values.

``double price = 3.14;``

`String`:

Represents textual data.

``String greeting = 'Hello, Dart!';``

`bool`:

Represents boolean values.

``bool isDartCool = true;``

2. Control Flow

`if` – `else`:

``````if (condition) {
// Code to execute if the condition is true
} else {
// Code to execute if the condition is false
}``````

`switch`:

``````switch (value) {
case 1:
// Code for case 1
break;
case 2:
// Code for case 2
break;
default:
// Code for other cases
}``````

Loops:

`while`:

``````while (condition) {
// Code to execute while the condition is true
}``````

`do-while`:

``````do {
// Code to execute at least once, then repeat while the condition is true
} while (condition);``````

`for`:

``````for (var i = 0; i < 5; i++) {
// Code to execute in each iteration
}``````

3. Functions

Declaring a Function:

``````void printMessage() {
print('This is a Dart function.');
}``````

Function with Parameters:

``````void greet(String name) {
print('Hello, \$name!');
}``````

Function with Return Type:

``````int add(int a, int b) {
return a + b;
}``````

4. Collections

Lists:

``List<int> numbers = [1, 2, 3, 4, 5];``

Sets:

``Set<String> uniqueNames = {'Alice', 'Bob', 'Charlie'};``

Maps:

``Map<String, int> ageMap = {'Alice': 30, 'Bob': 25, 'Charlie': 35};``

5. Object-Oriented Programming (OOP)

Classes and Constructors:

``````class Person {
String name;
int age;

Person(this.name, this.age);
}``````

Inheritance:

``````class Student extends Person {
String studentId;

Student(String name, int age, this.studentId) : super(name, age);
}``````

Polymorphism:

``````void printDetails(Person person) {
print('Name: \${person.name}, Age: \${person.age}');
}``````

6. Exception Handling

``````try {
// Code that might throw an exception
} catch (e) {
// Handle the exception
} finally {
// Code to execute regardless of whether an exception was thrown
}``````

7. Asynchronous Programming

`async` and `await`:

``````Future<void> fetchData() async {
// Asynchronous code
var data = await fetchDataFromServer();
print('Data: \$data');
}``````

`Future` and `Stream`:

``````Future<int> fetchNumber() async {
// Asynchronous operation
return 42;
}

Stream<int> numberStream() async* {
// Asynchronous generator
yield 1;
yield 2;
yield 3;
}``````

8. Packages and Libraries

Importing Packages:

``import 'dart:math';``

Using External Packages:

``import 'package:http/http.dart' as http;``

9. Dart SDK Tools

Dart DevTools: Dart DevTools is a suite of debugging and performance tools for Dart and Flutter developers.

Dart Analyze: Dart Analyze is a static analysis tool that helps catch errors and improve code quality.

10. Flutter Integration

Dart is often associated with the Flutter framework for building cross-platform mobile, web, and desktop applications. Ensure you have Flutter installed and explore Flutter-specific features and widgets.

This Dart Cheat Sheet provides a quick overview of essential Dart features and concepts. As you delve deeper into Dart development, remember that practice and hands-on experience are key to mastering any programming language. Happy coding with Dart!

Refer to the official documentation for more in-depth information and examples.

FAQ

1. What is Dart?

Dart is a programming language developed by Google, designed for building web, mobile, and server applications. It is known for its efficiency, strong support for modern development workflows, and its primary association with the Flutter framework for building cross-platform mobile applications.

2. Why use Dart?

Dart offers a combination of performance, productivity, and versatility. It features a strong type system, a concise syntax, and excellent support for asynchronous programming. Dart is also the primary language for Flutter, making it a popular choice for mobile app development.

3. Where is Dart used?

Dart is used in various domains, including web development, mobile app development (especially with Flutter), and server-side scripting. It’s employed by developers to create high-performance, scalable applications.

4. Is Dart only for Flutter?

While Dart is prominently associated with Flutter, it can be used for other purposes as well. Dart can be employed in web development, command-line scripts, server-side development, and more. Flutter, however, remains one of the most popular use cases for Dart.

5. What is Flutter, and how does it relate to Dart?

Flutter is an open-source UI software development toolkit created by Google, and Dart is the primary language used for building Flutter applications. Flutter allows developers to create natively compiled applications for mobile, web, and desktop from a single codebase.