Advanced Language Features

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1. 1 What is a `Proxy` and what traps does it support (get, set, has, deleteProperty, apply, construct)? Medium
2. 2 Implement a validation layer for an object using a `Proxy`'s `set` trap (e.g., reject invalid types). Hard
3. 3 Explain how `Reflect` methods mirror `Proxy` traps and why they're used together. Hard
4. 4 Implement a simple reactivity system (like Vue 3's) using `Proxy` to track property access and mutation. Hard
5. 5 What are the limitations of `Proxy` (e.g., cannot be fully polyfilled, invariant violations)? Hard
6. 6 Implement a negative-array-index accessor (Python-style `arr[-1]`) using a `Proxy`. Medium