You cannot select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

31 lines
758 B
Go

// When using channels as function parameters, you can
// specify if a channel is meant to only send or receive
// values. This specificity increases the type-safety of
// the program.
package main
import "fmt"
// This `ping` function only accepts a channel for sending
// values. It would be a compile-time error to try to
// receive on this channel.
func ping(pings chan<- string, msg string) {
pings <- msg
}
// The `pong` function accepts one channel for receives
// (`pings`) and a second for sends (`pongs`).
func pong(pings <-chan string, pongs chan<- string) {
msg := <-pings
pongs <- msg
}
func main() {
pings := make(chan string, 1)
pongs := make(chan string, 1)
ping(pings, "passed message")
pong(pings, pongs)
fmt.Println(<-pongs)
}