go channels select / published by https://github.com/dacr/code-examples-manager #686a22d1-9224-49ea-be72-1c8371cfc9f4/b9bc9db8efa12f47714594462867dc18894058ab

concurrency-channels-select.go

/*?sr/bin/true; exec /usr/bin/env nix-shell -p go --run "go run $0" #*/
// summary : go channels select
// keywords : go, channels, @testable
// publish : gist
// authors : David Crosson
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2)
// id : 686a22d1-9224-49ea-be72-1c8371cfc9f4
// created-on : 2025-03-27T16:43:12+01:00
// managed-by : https://github.com/dacr/code-examples-manager
// run-with : nix-shell -p go --run "go run $file"
package main

import (
	"fmt"
	"math/rand"
	"time"
)

func main() {
	ch1 := make(chan int, 1)
	ch2 := make(chan int, 1)

	go func() {
		time.Sleep(time.Duration(10+rand.Intn(100)) * time.Millisecond)
		ch1 <- 42
	}()

	go func() {
		time.Sleep(time.Duration(10+rand.Intn(100)) * time.Millisecond)
		ch2 <- 43
	}()

	select {
	case v := <-ch1:
		fmt.Println("Winner is channel 1", v)
	case v := <-ch2:
		fmt.Println("Winner is channel 2", v)
	}
}