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Puzzle 8 Explanation: Closure

Puzzle 8 Explanation: Closure

Understand how wait() works in Go.

We'll cover the following...

Try it yourself

Try running the code below to see the result for yourself.

Go (1.16.5)
package main
import (
	"fmt"
	"sync"
	"time"
)
func main() {
	var wg sync.WaitGroup
	for _, n := range []int{3, 1, 2} {
		wg.Add(1)
		go func() {
			defer wg.Done()
			time.Sleep(time.Duration(n) * time.Millisecond)
			fmt.Printf("%d ", n)
		}()
	}
	wg.Wait()
	fmt.Println()
}

Explanation

You probably expected 1 2 3. Each goroutine sleeps n milliseconds and then prints n. We use the wg.Wait() ...