wait groups

package main  
  
import (  
	"fmt"  
	"sync"  
)  
  
func worker(id int, ch chan int, wg *sync.WaitGroup) {  
	defer wg.Done()  
  
	result := id * 2 // Perform some work  
  
	ch <- result // Send the result to the channel  
}  
  
func main() {  
	numWorkers := 3  
	ch := make(chan int, numWorkers) // Creating a buffered channel  
	var wg sync.WaitGroup  
  
	for i := 0; i < numWorkers; i++ {  
		wg.Add(1)  // 
		go worker(i, ch, &wg)  
	}  
  
	go func() {  
		wg.Wait()  
		close(ch) // Close the channel when all workers have finished  
	}()  
	  
	for result := range ch {  
		fmt.Println(result) // Process the results  
	}  
}