Channels and Go Routines

main.go

package main

import (
	"fmt"
	"net/http"
)

func main() {
	links := []string{
		"http://google.com",
		"http://facebook.com",
		"http://stackoverflow.com",
		"http://golang.com",
		"http://amazon.com",
	}

	c := make(chan string)

	// 改成用匿名函式
	for _, link := range links {
		go func(link string) {
			_, err := http.Get(link)
			if err != nil {
				fmt.Println(link, "might be down!")
				c <- "might be down!"
				return
			}
			fmt.Println(link, "is up!")
		}(link)
	}

	// 只要 c 有東西就繼續跑
	for message := range c {
		fmt.Println(message)
	}

	close(c)
}

func checkLink(link string, c chan string) {
	_, err := http.Get(link)
	if err != nil {
		fmt.Println(link, "might be down!")
		c <- "might be down!"
		return
	}
	fmt.Println(link, "is up!")
}