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Grokking Node.js Design Patterns for Interviews

Solution: Proxy a Remote Object over Network Simulation

Explore how to implement the Proxy Pattern in Node.js to simulate a remote object accessed over a network. Learn to create a Proxy that intercepts property reads and writes, returning Promises that model asynchronous fetches and updates with delays. Understand how this pattern enables transparent, non-local data interactions to mimic real-world network requests.

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Solution explanation

  • Lines 2–5: We define remoteData as the simulated remote store.

    • This represents server-side data that can only be accessed asynchronously.

    • The Proxy will use this object to mimic network fetch and update behavior.

  • Lines 8–29: The createRemoteObject() function constructs a Proxy that controls both read and write interactions.

    • The handler defines get() and set() traps to simulate network communication.

    • The Proxy itself holds no data—every operation is async and externalized.

  • Lines 10–15 (get trap): Invoked when a property is accessed ...