How do I handle errors in Go goroutines?

How do I handle errors in Go goroutines?

In Go, you can handle errors in goroutines by returning errors from the function and using channels to communicate them back to the main goroutine.

Can you show me an example of that?

Sure! You can create a goroutine that performs a task and returns an error through a channel. Here's a simple example:

func doWork(ch chan error) {
    // Simulate work
    err := someFunction()
    ch <- err // Send error back to the main goroutine
}

func main() {
    ch := make(chan error)
    go doWork(ch)
    err := <-ch // Receive error
    if err != nil {
        fmt.Println("Error occurred:", err)
    }
}

What if I have multiple goroutines?

You can use a sync.WaitGroup to wait for multiple goroutines to finish and a slice of errors to collect any errors that occur. Here's an example:

var wg sync.WaitGroup
var errors []error

for i := 0; i < numGoroutines; i++ {
    wg.Add(1)
    go func() {
        defer wg.Done()
        if err := doWork(); err != nil {
            errors = append(errors, err)
        }
    }()
}

wg.Wait() // Wait for all goroutines to finish
if len(errors) > 0 {
    fmt.Println("Errors:", errors)
}