Concurrency programming example: test user reflexes

reflexes.go

package main

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

func init() {
	rand.Seed(time.Now().UnixNano())
}

func main() {
	goChan := make(chan time.Time)

	go func() {
		time.Sleep(time.Second * time.Duration(rand.Intn(3)))
		fmt.Println("Go !")
		goChan <- time.Now()
	}()

	bufio.NewReader(os.Stdin).ReadString('\n')
	userTime := time.Now()

	select {
	case goTime := <-goChan:
		fmt.Printf("%s\n", userTime.Sub(goTime))
	default:
		fmt.Println("Failed !")
	}
}