Non-Blocking Channel Operations with Select

Snippet

Non-Blocking Channel Operations with Select

The 'select' statement lets a goroutine wait on multiple communication operations. Using a 'default' case allows for non-blocking sends and receives, executing immediately if no channel is ready.

snippet.go
go
package main
 
import "fmt"
 
func main() {
    messages := make(chan string)
    signals := make(chan bool)
 
    select {
    case msg := <-messages:
        fmt.Println("received message", msg)
    default:
        fmt.Println("no message received")
    }
 
    msg := "hi"
    select {
    case messages <- msg:
        fmt.Println("sent message", msg)
    default:
        fmt.Println("no message sent")
    }
}

Breakdown

select { ... }

Blocks until one of its cases can run, unless a default case is present.

case msg := <-messages:

Attempts to receive a value from the messages channel.

default:

Executed if no other case is ready, making the select operation non-blocking.

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Non-Blocking Channel Operations with Select

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