พื้นฐาน Dart สำหรับ Flutter

Welcome to Dart!

Storing Data: Variables & Types

Variables in Action

void main() {
  var name = "Alice"; // Type inferred as String
  int age = 30;
  double height = 1.75;
  bool isStudent = true;
  String? middleName; // Can be null

  print("Name: $name");
  print("Age: $age");
  print("Student: $isStudent");
}

Grouping Data: Lists

void main() {
  List<String> fruits = ['Apple', 'Banana'];
  print('Initial fruits: $fruits');

  fruits.add('Orange'); // Add an item
  print('After adding: $fruits');

  print('First fruit: ${fruits[0]}');
}

Making Decisions: If/Else

void main() {
  int temperature = 25;

  if (temperature > 30) {
    print('It\'s very hot!');
  } else if (temperature > 20) {
    print('It\'s warm.');
  } else {
    print('It\'s cool.');
  }
}

Repeating Actions: Loops

void main() {
  List<String> colors = ['Red', 'Green', 'Blue'];

  for (String color in colors) {
    print('Color: $color');
  }

  for (int i = 0; i < 3; i++) {
    print('Count: $i');
  }
}

Functions: Reusable Code

Defining & Calling Functions

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

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

void main() {
  greet('Coddy');
  int sum = add(10, 5);
  print('Sum: $sum');
}

Basic Classes & Objects

class Car {
  String brand; // Property
  int year;    // Property

  Car(this.brand, this.year); // Constructor

  void displayInfo() { // Method
    print('$brand from $year');
  }
}

void main() {
  var myCar = Car('Toyota', 2020); // Create an object
  myCar.displayInfo(); // Call a method

  var otherCar = Car('Honda', 2022);
  otherCar.displayInfo();
}

Dart Fundamentals Check

Recap: Dart Essentials