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core-async
dgr 2025-10-19T17:21:22.289879Z
Throughout core.async, nil is used to signal a closed channel. I was looking at poll! earlier today and saw that it returns nil if there is no value currently available on the channel. How does poll! distinguish between value not available and channel closed?
Jan K 2025-10-19T17:28:32.900199Z
It returns nil for both, so it doesn't distinguish. But if you want to do that you can using alt! with a :default
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