Added Real-World Examples for State and Memento Patterns (PRs submitted)

Thank you!

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Opinion on Drive to Design Patterns

Second edition for refactoring course

Adquisición

Doesn't the mediator pattern violates open close principle

¿Por qué no habré conocido antes esta página y este libro?

Hi there everyone please add Dart support to the book becasue its not same as js even tho its pretty similar

Thank you!