What are some examples of using goroutines in Go?

What are some examples of using goroutines in Go?

Goroutines are lightweight threads in Go. A common example is making concurrent HTTP requests. Would you like to see a code snippet?

Yes, please show me a code snippet for that.

Here's a simple example:

package main

import (
    "fmt"
    "net/http"
    "sync"
)

func fetchURL(url string, wg *sync.WaitGroup) {
    defer wg.Done()
    resp, err := http.Get(url)
    if err != nil {
        fmt.Println(err)
        return
    }
    fmt.Println("Fetched:", resp.Status)
}

func main() {
    var wg sync.WaitGroup
    urls := []string{"http://example.com", "http://example.org"}

    for _, url := range urls {
        wg.Add(1)
        go fetchURL(url, &wg)
    }
    wg.Wait()
}

This code fetches multiple URLs concurrently using goroutines.

That's great! Can you explain how the WaitGroup works?

Sure! A WaitGroup is used to wait for a collection of goroutines to finish executing. You add to the WaitGroup with wg.Add(1) before starting a goroutine and call wg.Done() when the goroutine completes. Finally, wg.Wait() blocks until all goroutines have called Done().