scottt2/design-patterns-in-dart

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

design-patterns-in-dart's Issues

Dart patterns

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;

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()

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

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.