scottt2/design-patterns-in-dart

Gang of Four (GOF) design patterns implemented in Dart. Contributions welcome!

design-patterns-in-dart's Issues

Dart patterns

Improve decorator pattern example

In the decorator pattern example, the two classes are different. The StarbucksDecorator is not decorating an existing coffee object but creating a new coffee object every time. This class should take a coffee object in its constructor and work on it.
Let me know what you think about it. I'd love to contribute to this.

late is not correct for _next in chain_of_responsibility

when you define _next late, for last Logger we get error (or any logger that we dont need _next ) because this variable is not initilized.
we must change it to Nullable inctance instead, like below:
Logger? _next;

Add UML Diagrams

I think especially for programmers who don't know exactly how each pattern works, it would be nice to have some UML Diagrams to make the concept more clear

What does ._internal() mean in Singleton Pattern?

Hello, please, explain, what does ._internal() mean in Singleton Pattern?

class Me {
  static final Me _singleton = new Me._internal();
  static final String _name = "Tyler";

  factory Me() {
    return _singleton;
  }

  static String get name => _name;
 
  @override
  String toString() => "Hello, my name is $name.";

  Me._internal();
}

Me._internal()