Dart

Dart Runtime

• install (fvm) (homebrew)

  dart run main.dart
  dart create xspring-app
  

• dartpad

Basic File Structure

- bin
- lib
- test
- pubspec.yaml
- pubspec.lock

Testing in Dart and OOP

• modify test file
• test class Calculator
• implement Calculator with plus
• remove as;

OOP cont.

class Calculator {
  final _a;
  final _b;

  Calculator(this._a, this._b);

  int plus() {
    return _a + _b;
  }
}

OOP cont.

class Calculator {
  final _a;
  final _b;

  Calculator(this._a, this._b);

  int plus() {
    return _a + _b;
  }
}

OOP extend

class SuperCalculator extends Calculator {
  SuperCalculator(int a, int b) : super(a, b);

  @override
  int plus() {
    return super.plus() + 1;
  }
}

Async, Await

Future<int> plusAsync() async {
  return _a + _b;
}

test('plusAsync', () async {
  int a = 1;
  int b = 2;

  Calculator cal = Calculator(a, b);

  expect(await cal.plusAsync(), 3);
});

Flutter

• structure (similar to above)
• introduce GetX

Flutter

• Initializing
• main.dart -> setup.dart -> app.dart
• Flavor and Target
• null safety ?, !

app.dart

• Route

GetX

• pass params
• GetX service, controller -> Life cycle
  • controller, return mem once unused
  • service, longer live
• Get.arguments
• Get.Put, Get.find
• Get.toNamed