kp-select

One-line summary

A select { … } expression suspends on multiple suspending clauses (channel receives, deferred awaits, timeouts) at once and resumes when the first one becomes ready — coroutine-safe, biased toward declaration order.

When to use this skill

• Multiplexing across several channels: "wait for input from any of these sources".
• Racing several Deferred<T> and acting on the first to finish (other branches naturally lose).
• Implementing a timeout: select between the real operation and an onTimeout clause.
• Building a non-blocking poll across channel state without locking up the calling coroutine.

When NOT to use this skill

• A single source — await, receive, or delay directly. select adds ceremony for no benefit.
• "Pick the latest" semantics on a Flow → use flatMapLatest, not select.
• Choosing between alternative algorithms (no timing involved) → when on a config flag.

Core content