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