Design Patterns Mastery Roadmap

Master the essential design patterns that form the foundation of robust software architecture. Learn time-tested solutions to common programming problems used across all major programming languages.

Design Pattern Fundamentals

Concept Status
Core Principles
What are Design Patterns?
History & Gang of Four
Pattern Categories Overview
When to Use Patterns
Anti-patterns & Overuse
SOLID Principles
Single Responsibility Principle (SRP)
Open/Closed Principle (OCP)
Liskov Substitution Principle (LSP)
Interface Segregation Principle (ISP)
Dependency Inversion Principle (DIP)
Object-Oriented Design
Composition vs Inheritance
Encapsulation & Information Hiding
Polymorphism & Dynamic Dispatch
Abstraction & Interfaces

Creational Patterns

Concept Status
Core Creational Patterns
Singleton Pattern
Factory Method Pattern
Abstract Factory Pattern
Builder Pattern
Prototype Pattern
Singleton Variations
Thread-Safe Singleton
Lazy Initialization
Double-Checked Locking
Enum Singleton (Java)
Singleton Alternatives
Factory Patterns
Simple Factory vs Factory Method
Factory Method Implementation
Abstract Factory Use Cases
Factory with Dependency Injection
Builder Pattern Variations
Step Builder Pattern
Fluent Interface Builder
Director & ConcreteBuilder
Builder with Validation

Structural Patterns

Concept Status
Core Structural Patterns
Adapter Pattern
Decorator Pattern
Facade Pattern
Composite Pattern
Bridge Pattern
Flyweight Pattern
Proxy Pattern
Adapter Variations
Object Adapter vs Class Adapter
Two-Way Adapter
Pluggable Adapter
Decorator Applications
Java I/O Streams (Decorator)
Component-based Decorators
Decorator vs Inheritance
Proxy Types
Virtual Proxy (Lazy Loading)
Protection Proxy (Access Control)
Remote Proxy (RPC/Network)
Caching Proxy

Behavioral Patterns

Concept Status
Core Behavioral Patterns
Observer Pattern
Strategy Pattern
Command Pattern
State Pattern
Template Method Pattern
Chain of Responsibility
Iterator Pattern
Mediator Pattern
Memento Pattern
Visitor Pattern
Interpreter Pattern
Observer Implementations
Push vs Pull Observer
Event-Driven Architecture
Model-View-Controller (MVC)
Reactive Programming
Strategy Applications
Algorithm Families
Strategy with Factory
Context-Strategy Interaction
Command Pattern Uses
Undo/Redo Operations
Macro Commands
Queuing & Logging
Remote Method Invocation

Modern & Architectural Patterns

Concept Status
Dependency Injection
Constructor Injection
Setter Injection
Interface Injection
IoC Containers
Service Locator Pattern
Architectural Patterns
Model-View-Presenter (MVP)
Model-View-ViewModel (MVVM)
Repository Pattern
Unit of Work Pattern
Data Access Object (DAO)
Data Transfer Object (DTO)
Concurrency Patterns
Producer-Consumer Pattern
Thread Pool Pattern
Future/Promise Pattern
Actor Model
Reactor Pattern
Enterprise Patterns
Business Delegate
Service Layer
Domain Model
Transaction Script
Table Module

Functional & Modern Paradigms

Concept Status
Functional Programming Patterns
Higher-Order Functions
Function Composition
Immutable Objects
Monads & Functors
Option/Maybe Pattern
Reactive Patterns
Observable Streams
Backpressure Handling
Event Sourcing
CQRS Pattern
Microservices Patterns
API Gateway
Circuit Breaker
Bulkhead Pattern
Saga Pattern
Strangler Fig Pattern
Cloud-Native Patterns
Sidecar Pattern
Ambassador Pattern
Anti-Corruption Layer
Backend for Frontend (BFF)

Real-world Applications

Concept Status
Framework Patterns
Spring Framework Patterns
React/Redux Patterns
Angular Patterns
Express.js Patterns
Database Patterns
Active Record Pattern
Data Mapper Pattern
Query Object Pattern
Specification Pattern
Testing Patterns
Mock Object Pattern
Test Double Patterns
Page Object Pattern
Builder Pattern for Tests
Performance Patterns
Object Pool Pattern
Lazy Loading Pattern
Caching Patterns
Copy-on-Write Pattern
Error Handling Patterns
Exception Translation
Retry Pattern
Timeout Pattern
Fallback Pattern