Grokking Node.js Design Patterns for Interviews/

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Solution: Log Every Property Read on a Config Object

Solution: Log Every Property Read on a Config Object

Use a proxy’s get trap to log property names each time they’re accessed.

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Solution explanation

  • Lines 2–6: We define the config object that stores static application settings.

    • This acts as the target object for the Proxy.

    • It remains unmodified—the Proxy only observes its interactions.

  • Lines 9–14: We create a new Proxy instance around config with a get() trap.

    • The get() trap runs whenever a property is read on the Proxy. ...