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Dart Basic Course

Thu, 09 Jul 2026 19:00:00 +0800

Dart Bangla Course

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Coding in DartPad

dartpad

Main Method & Comments

DataTypes

Number in dart

String

Boolean

List

Map

Condition & break

If-Else

For Loop

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Abstract & Generic class

Sun, 23 Aug 2026 19:00:00 +0800

Abstract class

You went to your local restaurant for breakfast. When you got there, you saw a lump of raw dough sitting in front of the stove. Then a boy came over and asked, “Ruti, paratha, or naan?” Whatever you say, they prepare it right on the spot and serve it to you.

Sealed & Union class

Sun, 23 Aug 2026 19:00:00 +0800

I hope you’ve already checked the Abstract & Generic.
We already know what abstract class is, and it can be extend from anywhere.

// api_state.dart
abstract class ApiState {}

class Loading extends ApiState {}
class Success extends ApiState {}

// api_provider.dart
class Error extends ApiState {}

Sealed class

But Sealed class restrict extending class outside the library. You can only extends it within the same library/file.