cheat.sheets/sheets/_go/Channels

ch := make(chan int) // create a channel of type int
ch <- 42             // Send a value to the channel ch.
v := <-ch            // Receive a value from ch

// Create a buffered channel.
// Writing to a buffered channels does not block 
// if less than <buffer size> unread values have been written.
ch := make(chan int, 100)
// Non-buffered channels block.
// Read blocks when no value is available,
// write blocks if a value already has been written but not read.

close(ch) // closes the channel (only sender should close)

// read from channel and test if it has been closed
v, ok := <-ch
// if ok is false, channel has been closed

// Read from channel until it is closed
for i := range ch {
    fmt.Println(i)
}

// select blocks on multiple channel operations,
// if one unblocks, the corresponding case is executed
func doStuff(channelOut, channelIn chan int) {
    select {
    case channelOut <- 42:
        fmt.Println("We could write to channelOut!")
    case x := <- channelIn:
        fmt.Println("We could read from channelIn")
    case <-time.After(time.Second * 1):
        fmt.Println("timeout")
    }
}