To wait for multiple goroutines to finish, we can use a wait group.

main.go

// To wait for multiple goroutines to finish, we can
// use a *wait group*.

package main

import (
    "fmt"
    "sync"
    "time"
)

// This is the function we'll run in every goroutine.
// Note that a WaitGroup must be passed to functions by
// pointer.
func worker(id int, wg *sync.WaitGroup) {
    fmt.Printf("Worker %d starting\n", id)

    // Sleep to simulate an expensive task.
    time.Sleep(time.Second)
    fmt.Printf("Worker %d done\n", id)

    // Notify the WaitGroup that this worker is done.
    wg.Done()
}

func main() {

    // This WaitGroup is used to wait for all the
    // goroutines launched here to finish.
    var wg sync.WaitGroup

    // Launch several goroutines and increment the WaitGroup
    // counter for each.
    for i := 1; i <= 5; i++ {
        wg.Add(1)
        go worker(i, &wg)
    }

    // Block until the WaitGroup counter goes back to 0;
    // all the workers notified they're done.
    wg.Wait()
}