Type Systems

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1. 1 Explain structural typing in TypeScript versus nominal typing — why can two unrelated interfaces be compatible? Medium
2. 2 What is the difference between `interface` and `type` aliases, and when would you prefer one over the other? Easy
3. 3 Explain generics with a practical example (e.g., a generic `useFetch<T>` hook return type). Medium
4. 4 What are union and intersection types, and how does TypeScript narrow union types via type guards? Medium
5. 5 Explain utility types like `Partial`, `Pick`, `Omit`, and `Record`, with when you'd use each. Medium
6. 6 What is the difference between `any`, `unknown`, and `never`, and why is `unknown` safer than `any`? Medium
7. 7 Explain how TypeScript's structural typing interacts with excess property checks on object literals. Hard