🧠 When to Use Which Design Pattern in JavaScript
Category: general / design-patterns
Difficulty: medium
Choosing the right design pattern depends on the problem you're solving, not on the pattern itself. Patterns are just tools — and like all tools, their value lies in applying them at the right time. 🧭 Step-by-Step Guide: How to Choose the Right Design Pattern ✅ Understand the Problem Domain First Ask yourself: Are you managing object creation? Are you restructuring or connecting objects? Are you responding to runtime behavior changes? Do you need encapsulation or reusability? These lead you to the right pattern category: Design Pattern Category Creational (Factory, Singleton, Builder) Organizing and composing objects Behavioral (Observer, Strategy, Command, etc.) If you need to... Create many similar objects Singleton Add parts step-by-step Module Notify others when something changes Strategy Encapsulate behavior (e.g., undo, retry) Constructor + Prototype Adapt old or incompatible interface Decorator Access a simplified interface to a complex system Proxy Handle requests via chain of handlers Memento Coordinate complex interactions between objects State Apply operation across object structure (e.g., trees) Composite Share memory-efficient objects (e.g., rendering) 🧪 Evaluate Trade-offs and Codebase Needs Ask: 🔄 Reusability: Do I want to share this logic? 🧪 Testability: Can I mock or isolate this easily? ⚙️ Complexity: Is this overengineering or adding clarity? 🚀 Performance: Do I need to optimize memory or execution? You're absolutely right — the article structure is solid, but the "Quick Examples by Use Case" section only includes a subset of the full list of patterns mentioned. Let's extend that section to include examples for all 18 patterns covered in the summary table. 🧩 Quick Examples by Use Case 🔹 Use the Factory Pattern when: [code example] 🔹 Use the Builder Pattern when: [code example] 🔹 Use the Singleton Pattern when: [code example] 🔹 Use the Module Pattern when: [code example] 🔹 Use the Observer Pattern when: [code example] 🔹 Use the Strategy...