When is a deferred function called? (upon exiting a local block / upon exiting a function / upon application termination)

In Go, a deferred function declared with the defer keyword is called when the function in which it was declared exits. This happens regardless of how the function terminates — whether by normal return, panic, or other means.

Important:

• defer executes upon exiting the entire function, not just a local block inside the function.
• If defer is declared inside a loop or block, it will still execute upon exiting the function.

Example:

func example() {
    defer fmt.Println("Deferred function will execute upon exiting example")
    fmt.Println("Inside the function")
}

Here, the deferred function will be called after example completes.