Channels

Advanced · Concurrency

Beyond basic send/receive: buffering and direction.

• channels1 — buffered vs unbuffered (make(chan T, n))
• channels2 — directional types (chan<- T send-only, <-chan T receive-only)

See also the concurrent, select, and concurrency_patterns topics.

Resources

• A Tour of Go: Buffered Channels
• Go by Example: Channel Buffering
• Go by Example: Channel Directions

Exercises

channels1 test

A buffered channel — make(chan T, n) — holds up to n values without a

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Give the channel a buffer so sends do not block:

ch := make(chan int, len(vals))

Source

channels2 test

Channel direction in a signature documents and enforces intent:

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Drain the receive-only channel with range:

for v := range in { got = append(got, v) }

Source