Sync Primitives

sync.WaitGroup - Wait for Goroutines

CORRECT

func processBatch(items []string) {
    var wg sync.WaitGroup

    for _, item := range items {
        wg.Add(1) // BEFORE launching goroutine
        go func(item string) {
            defer wg.Done()
            process(item)
        }(item)
    }