What is the defer statement in Go?

Can you explain what the defer statement does in Go?

Sure! The defer statement 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 it work with function return values?

When a deferred function is called, it executes after the surrounding function returns, but before the return value is sent to the caller.

Can you give me an example of using defer?

Absolutely! Here's a simple example:

func main() {
    defer fmt.Println("World")
    fmt.Println("Hello")
}

This will output:

Hello
World

Are there any performance implications of using defer?

Yes, using defer can introduce a slight overhead because the deferred calls are pushed onto a stack. However, it's often negligible compared to the benefits of cleaner code.