What is the performance impact of using defer in Go?

What is the performance impact of using defer in Go?

Using defer in Go can simplify code but may introduce performance overhead due to the way deferred calls are managed.

Can you explain how defer works under the hood?

When a function with a deferred call returns, Go pushes the deferred calls onto a stack and executes them in LIFO order.

Is there a significant difference in performance between using defer and direct function calls?

Yes, while defer adds some overhead, the difference is often negligible unless in performance-critical sections.

What are some best practices for using defer in Go?

Best practices include using defer for resource cleanup, but avoid using it in tight loops to minimize performance impact.