Example of WaitGroup in Golang

wait_group.go

package main

import (
	"fmt"
	"sync"
)

func sayHello() {
	for i := 0; i <= 100; i++ {
		fmt.Println("Hello", i)
	}
}

func sayGoodBye() {
	for i := 0; i <= 100; i++ {
		fmt.Println("Good Bye", i)
	}
}

func main() {
	var wg sync.WaitGroup

	fmt.Println("Execution start")

	wg.Add(1)
	go func() {
		defer wg.Done()
		sayHello()
	}()

	wg.Add(1)
	go func() {
		defer wg.Done()
		sayGoodBye()
	}()

	wg.Wait()
	fmt.Println("Execution end")

}