go_concurrency.channels.read_write.main.go

package main

import (
	"fmt"
	"sync"
)

var wg sync.WaitGroup

func main() {
	ch := make(chan string)
	wg.Add(2)

	go write(ch)
	go read(ch)

	wg.Wait()
}

func read(ch <-chan string) {
	fmt.Println(<-ch)
	wg.Done()
}

func write(ch chan<- string) {
	ch <- "Hello world!"
	wg.Done()
}