Go Concurrency Distilled

Automated excerpt

When the sending goroutine writes a value to the channel (ch <- val), it blocks and waits for someone to receive that value (<-ch). Once all values are taken, it returns a zero value and a false status, like a regular channel:stream := make(chan int, 1) nil channelLike any type in Go, channels have a zero value, which is nil. Writing to or reading from a nil channel blocks the goroutine indefinitely:var stream chan int SelectThe select statement is somewhat like switch, but specifically designed for channels. To acquire the semaphore, send a value into the channel.

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