What is the 'defer' keyword in Go concurrency?

Can you explain how the 'defer' keyword works in Go concurrency?

Sure! The 'defer' keyword in Go is used to schedule a function call to be run after the function completes. It's often used for cleanup tasks.

How does 'defer' affect the execution order in concurrent functions?

In concurrent functions, 'defer' calls are executed in LIFO order, meaning the last deferred function is executed first when the surrounding function returns.

Can you give me an example of using 'defer' in a goroutine?

Absolutely! Here's a simple example:

func myFunction() {
    defer fmt.Println("Cleanup")
    fmt.Println("Running myFunction")
}

func main() {
    go myFunction()
    time.Sleep(1 * time.Second)
}

In this case, "Cleanup" will be printed after "Running myFunction".

Are there any performance implications of using 'defer'?

Yes, using 'defer' can introduce a slight overhead because it adds a function call to the stack. However, it's often negligible compared to the benefits of cleaner code.