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Grokking Node.js Design Patterns for Interviews

Solution: Hybrid Service Adapter for Fallback APIs

Explore how to create a HybridCurrencyAdapter that abstracts multiple currency conversion providers behind a single interface. Learn to handle unreliable APIs by managing async errors and normalizing responses, ensuring a stable and reusable solution for fallback behavior.

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Solution explanation

  • Lines 2–7: We simulate the primary API, which sometimes fails to represent an unreliable third-party service.

    • Its successful response includes { ok, rate, vendor }.

    • When it fails, it throws an error—typical for modern ...