Bootcamp
A one-week sprint through the patterns you will actually reach for in production code.
Bootcamp plan
EXAMPLE
# Design patterns bootcamp - 5 working days Day 1 - Creational (1): Factory + Builder. Build a small DSL for constructing immutable configuration objects. Day 2 - Creational (2): Singleton + Dependency Injection. When Singleton is fine (cache, registry) and when DI is mandatory (testing, scope). Day 3 - Structural: Adapter + Decorator + Composite. Refactor a third-party SDK call into an adapter, layer logging + retry with decorators. Day 4 - Behavioural (1): Strategy + State + Template Method. Replace a 200-line switch with strategies; model an order lifecycle with state. Day 5 - Behavioural (2): Observer + Command + Iterator. Build a typed event bus, an undoable command stack, and a custom iterator. Weekend - capstone: Pick a small open-source project. Find one place where a pattern would be helpful and one place where introducing one would make things worse. Open a PR for the first and write a one-page reasoning for the second. ## Tips - Patterns are vocabulary, not boilerplate - The best PRs that introduce a pattern delete more code than they add - 'Just a function' or 'just a record' is often the right answer
Why it matters
The hardest skill is knowing when NOT to apply a pattern. Bootcamps teach you the names; experience teaches you the limits. The capstone reasoning is more valuable than the PR.
Tip: Tweak the snippet with Try it Yourself », then sit the quiz at the bottom of the page.
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