Intermediate~4h
Structural Design Patterns in Low-Level DesignInterview Readiness Check
Compose objects into larger structures — Adapter, Decorator, Proxy, Facade, Composite, Bridge, Flyweight — without rewriting existing code.
adapterdecoratorproxyfacadecompositebridgeflyweightwrappingobject compositionhas-a vs is-a
Learning path
What this module tests
- Conceptual understanding of structural design patterns fundamentals
- Trade-offs and design decisions in real system scenarios
- adapter and decorator — applied knowledge
- Interview-style reasoning and explanation quality
Free to start
Take the Structural Design Patterns check →
10 questions · Dimension scoring · AI coach feedback · Shareable result
Test your knowledge — free →No credit card · Takes 10–15 min
Frequently asked questions
- What does the Structural Design Patterns check test?
- The check covers compose objects into larger structures — adapter, decorator, proxy, facade, composite, bridge, flyweight — without rewriting existing code. Questions span beginner to advanced difficulty and test both conceptual understanding and practical trade-off reasoning.
- What keywords should I know for Structural Design Patterns?
- Key concepts include: adapter, decorator, proxy, facade, composite, bridge, flyweight, wrapping, object composition, has-a vs is-a. These frequently appear in low-level design interviews at product and infrastructure companies.
- How many questions are in the check?
- Each check has 10 questions — a mix of MCQ and short-answer. You get scored by dimension (e.g., scalability, consistency) so you know exactly where to focus.
- How long does it take to study Structural Design Patterns?
- Most engineers spend around 4 hours on this module. The check itself takes about 10–15 minutes. You can retake it up to 3 times per day.
- What prerequisite knowledge do I need before Structural Design Patterns?
- Structural Design Patterns builds on Creational Design Patterns. Complete those first for the best results.
- Is adapter, decorator, proxy covered?
- Yes. The Structural Design Patterns module covers adapter, decorator, proxy among other key concepts. The check includes questions that reflect real low-level design interview patterns.