Dart

Dart Bangla Course 🎥 Checkout playlist on youtube Coding in DartPad dartpad Main Method & Comments DataTypes Number in dart String Boolean List Map Condition & break If-Else For Loop Links: ...

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. Here the dough on the counter is the abstract class. abstract class Dough{} It exits, but it has no final form. You can not eat it raw rough dough. In programming we would say, you can not initiate it. ...

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. ...

I hope you’ve already checked the Abstract & Generic . We already know what abstract class is and it can be extend from anywhere by importing the abstract class. It offered the benefits of restriction extending class outside the library. abstract class ApiState {} class Loading extends ApiState {} class Success extends ApiState {} class Error extends ApiState {} But we create a sealed class, it can not be only extend from that library/file. Note each file is a library, and you can use part/part of to combine multiple file. ...

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. ...