AbortControlleradvanced

AbortController — abort is idempotent (first reason wins)

📖 Usage Example

const ac = new AbortController()
ac.abort()
ac.abort()  // calling again has no effect

Calling abort() more than once is safe; only the first call has effect.

AbortController idempotency

Once aborted, calling abort() again has no effect — the original reason is preserved.

Challenge: Abort twice with different reasons and verify the first reason is kept.

💡 Hints (1)

• Once a signal is aborted, subsequent calls to abort() are ignored — the signal is immutable after the first abort

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