Grokking Node.js Design Patterns for Interviews/

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Solution: Decorate a Retryable Operation with Metrics

Solution: Decorate a Retryable Operation with Metrics

Implement a retry mechanism for unreliable async operations, then wrap it with logging and timing decorators to track execution and stability.

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Solution explanation

  • Lines 2–5: We define flakyOperation, an async function that fails about 75% of the time. It simulates a flaky network or external API call.

  • Lines 8–19: We implement retry(fn).

    • It returns a wrapper that tries to execute fn up to three times.

    • Each time an error occurs, we log [RETRY] Attempt X failed.

    • If the final attempt also fails, we rethrow the error.

    • If any attempt succeeds, we return immediately.

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