Grokking Node.js Design Patterns for Interviews/

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Solution: Auto-Default Missing Values

Solution: Auto-Default Missing Values

Use the get trap to safely handle missing properties by returning default values.

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Solution explanation

  • Lines 2–5: We define the base config object with only two properties: appName and version.

    • This represents a partial configuration that may be missing keys.

    • The Proxy will fill those gaps dynamically without mutating this object.

  • Lines 8–15: We create a new Proxy that intercepts property reads through the get() trap.

    • When a property exists in the ...