sync1.go

package main

import (
	"fmt"
	"sync"
)

// 4
func printer(msg string, wg *sync.WaitGroup) {
	defer wg.Done()
	fmt.Printf("Hello %s\n", msg)
}

func main() {
	// 1
	greeks := []string{"plato", "socrates", "aristotle", "archimedes", "pythagoras", "democritus"}
	// 2
	var wg sync.WaitGroup
	fmt.Println("Init")

	for _, philosopher := range greeks {
		// 3
		wg.Add(1)
		go printer(philosopher, &wg)
	}
	
	// 5
	wg.Wait()
	fmt.Println("End")
}