| 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 |
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import "fmt" |
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| 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) { |
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pings <- msg |
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} |
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| The `pong` function accepts one channel for receives (`pings`) and a second for sends (`pongs`). | 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) |
passed message |
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} |