Architecture

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1. 1 Explain the Module pattern and how it provides encapsulation using closures/IIFEs. Easy
2. 2 Implement the Singleton pattern in JavaScript and discuss whether it's an anti-pattern in modern module systems. Medium
3. 3 Implement the Observer pattern (Pub/Sub) from scratch with `subscribe`, `unsubscribe`, and `publish`. Medium
4. 4 Explain the Factory pattern and give a frontend use case (e.g., creating different UI components based on config). Medium
5. 5 Explain the Decorator pattern and how higher-order components/functions implement it in JS/React. Medium
6. 6 Implement a simple state machine pattern for managing UI states (idle/loading/success/error). Hard
7. 7 Explain the Strategy pattern and how it helps avoid large conditional blocks for interchangeable algorithms. Medium
8. 8 Explain the Proxy pattern using JavaScript's native `Proxy` object with a validation use case. Hard