Design Patterns

Design patterns in programming are reusable solutions to common software design problems.

Classification

🎯 Design Patterns – Code & Concepts

Collections of Design Pattern implementations with concept explanations and code examples in Python and JavaScript.

🏗️ Creational Design Patterns

Sl. No.	Design Pattern	Concept	Python Code	JavaScript Code
1	Singleton Pattern		Python	JS
2	Factory Pattern		Python	JS
3	Abstract Factory Pattern		Python	JS
4	Builder Pattern		Python	JS
5	Prototype Pattern		Python	JS

🧱 Structural Design Patterns

Sl. No.	Design Pattern	Concept	Python Code	JavaScript Code
6	Adapter Pattern	Concept	Python	JS
7	Decorator Pattern	Concept	Python	JS
8	Facade Pattern	Concept	Python	JS
9	Composite Pattern	Concept	Python	JS
10	Proxy Pattern	Concept	Python	JS
11	Bridge Pattern	Concept	Python	JS
12	Flyweight Pattern	Concept	Python	JS

🔄 Behavioral Design Patterns

Sl. No.	Design Pattern	Concept	Python Code	JavaScript Code
13	Command Pattern	Concept	Python	JS
14	Mediator Pattern	Concept	Python	JS
15	Chain of Responsibility	Concept	Python	JS
16	State Pattern		Python	JS
17	Template Pattern		Python	JS
18	Null Object Pattern		Python	JS
19	Observer Pattern	Concept	Python	JS
20	Strategy Pattern	Concept	Python	JS
21	Iterator Pattern	Concept	Python	JS
22	Visitor Pattern	Concept	Python	JS
23	Memento Pattern	Concept	Python	JS

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Practical Implementations

Collections of python code for different design pattern implementation on real life objects

1. Tic-Tac-Toe (uml)
2. Elevator System (uml)
3. Hash Map Data Structure
4. Vending Machine (uml)
5. BookMyShow (Ticket Booking Service) (uml)
6. ATM Machine (uml)
7. File System
8. Calculator
9. Splitwise (uml)
10. Cricbuzz
11. Inventory Management
12. Parking Lot Management

Credits

All credits to Shreyansh Jain for his amazing LLD playlist

Further Resources

1. How To Remember Design Patterns
2. Design Patterns Interview Questions

Author

Prateek Gupta