← Design Patterns learning pathDesign Patterns · Module 10 of 10
Choosing and applying patterns
Use patterns wisely in real projects and interviews.
📖 Key ideas
- Start with simple code; refactor to patterns when needs appear.
- Name patterns in code reviews for clarity.
- Watch for anti-patterns: God object, spaghetti code, golden hammer.
- Interviews ask Singleton, Factory, Observer, Strategy and their trade-offs.
- Practise by refactoring a small project with 3–4 patterns.
💡 Real-life example: Patterns are tools in a toolbox: a good carpenter picks the right one, not the shiniest.
Refactoring to patternsIntroducing patterns when needed
God objectClass that does too much
Golden hammerUsing one tool for every problem
Trade-offBenefit versus cost