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

DartPad: DartPad is an online editor for Dart where you can write, run, and share Dart code in your web browser.

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.

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