Learn X By Example
Learn X By Example

    Go by Example: Channel Directions

    Go by Example : Channel Directions

    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)
}
    $ go run channel-directions.go
passed message

    Next example: Select .

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    Go by Example: Channel Buffering
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    Go by Example: Channel Synchronization