Retry requests with exponential backoff

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Retry requests with exponential backoff · UIHero

Retry requests with exponential backoff

Retry an asynchronous operation with bounded exponential delays, cancellation, and injectable scheduling.

MediumJavaScript Reliability

55 min0% acceptance

Description

Implement retryWithBackoff around a lazy operation. Failures retry after exponentially increasing delays until success or maxAttempts, abort signals stop all work, and an injected sleep function keeps timing deterministic and testable.

Requirements

The solution exports the required retryWithBackoff API from the editable module.
Exponential delays works deterministically for the documented normal, boundary, and repeated-use scenarios.
Success stops works deterministically for the documented normal, boundary, and repeated-use scenarios.
Max attempts works deterministically for the documented normal, boundary, and repeated-use scenarios.
Final error works deterministically for the documented normal, boundary, and repeated-use scenarios.
Abort works deterministically for the documented normal, boundary, and repeated-use scenarios.
Scheduler injection works deterministically for the documented normal, boundary, and repeated-use scenarios.

Success on the third attempt

Input

maxAttempts 4, baseDelayMs 100; first two attempts reject

Expected output

Delays are 100 and 200, then the third value resolves

Explanation

No delay occurs before the first attempt or after a successful attempt.

Constraints

maxAttempts is a positive integer
Never retry after an AbortSignal is aborted
Rethrow the final operation error unchanged

Hints

Hint 1

Count attempts from one and delays from zero so the first retry uses the base delay.

Hint 2

Check cancellation before the operation and before and after sleeping.

Hint 3

Inject sleep instead of hard-coding timers into the retry loop.

promisesretryAbortSignal

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