goroutine.go

package main

import (
	"fmt"
	"sync"
)

func main() {
	// Create a WaitGroup
	var wg sync.WaitGroup

	// Create an unbuffered channel
	messageChannel := make(chan string)

	// Add 2 to the WaitGroup counter (for two goroutines)
	wg.Add(2)

	// Immediately invoked function for the first goroutine
	go func() {
		defer wg.Done()         // Mark this goroutine as done
		messageChannel <- "Hello" // Send "Hello" to the channel
	}()

	// Immediately invoked function for the second goroutine
	go func() {
		defer wg.Done()         // Mark this goroutine as done
		messageChannel <- "World" // Send "World" to the channel
	}()

	// Start a goroutine to wait for all goroutines to finish and then close the channel
	go func() {
		wg.Wait()              // Wait for the two goroutines to finish
		close(messageChannel)  // Close the channel to signal no more data
	}()

	// Infinite for loop to read messages from the channel
	for msg := range messageChannel {
		fmt.Println(msg)
	}

	fmt.Println("All done!")
}