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TypeScript
Concurrency Limiter (semaphore)
Run an array of async tasks but limit concurrency to N at a time — like p-limit, in 30 lines. Preserves input order in the output array.
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Java
Semaphore — Bounded Concurrency
Limit how many threads can enter a critical section. `acquire()` blocks until a permit is available; `release()` returns one. Use for rate limits, connection pools, or any "max N at a time" pattern.
Python
asyncio Concurrency Limiter (Semaphore)
Run hundreds of coroutines but cap how many are in-flight at any moment. asyncio.Semaphore inside the task body is the cleanest way to "do at most 10 of these at a time."
Go
Concurrency Limit via Buffered Channel (Semaphore)
A buffered channel of size N is the simplest semaphore in Go — acquire by sending, release by receiving. Zero dependencies, no sync.Semaphore needed.