Design Patterns
Learn proven solutions to common software design problems. These patterns are essential for writing maintainable, scalable, and efficient code that interviewers look for.
Creational Patterns
Singleton
Ensure a class has only one instance with global access.
Factory Method
Create objects without specifying exact classes.
Abstract Factory
Create families of related objects.
Builder
Construct complex objects step by step.
Prototype
Clone objects instead of creating new ones.
Structural Patterns
Adapter
Convert interface of a class into another interface.
Decorator
Add behavior to objects dynamically.
Facade
Provide simplified interface to complex subsystems.
Proxy
Control access to objects.
Composite
Compose objects into tree structures.
Behavioral Patterns
Observer
Notify multiple objects about state changes.
Strategy
Define family of algorithms and make them interchangeable.
Command
Encapsulate requests as objects.
Iterator
Access elements sequentially without exposing structure.
State
Change object behavior based on internal state.
Template Method
Define skeleton of algorithm in base class.
Learning Tips
- →Focus on understanding the problem each pattern solves
- →Learn when NOT to use a pattern (anti-patterns)
- →Practice implementing patterns in your preferred language
- →Study real-world examples in popular frameworks and libraries