Channels should usually have a size of one or be unbuffered. By default, channels are unbuffered and have a size of zero. Any other size must be subject to a high level of scrutiny. Consider how the size is determined, what prevents the channel from filling up under load and blocking writers, and what happens when this occurs.
| Bad | Good |
|---|---|
// Ought to be enough for anybody!
c := make(chan int, 64) |
// Size of one
c := make(chan int, 1) // or
// Unbuffered channel, size of zero
c := make(chan int) |