defer
The defer statement defers the execution of a function until the surrounding function returns. Let's try to explain this a bit better. Inside a function, you have a defer in front of a function that you are calling. That function will execute essentially right before the function you are currently inside completes. Still confused? Perhaps an example will make this concept a little clearer:
package main
import "fmt"
func main() {
defer done()
fmt.Println("Main: Start")
fmt.Println("Main: End")
}
func done() {
fmt.Println("Now I am done")
}
The output for the defer example is as follows:
Main: Start Main: End Now I am done
Inside the main() function, we have a deferred function, defer done(). Notice that the done() function has no new or special syntax. It just has a simple print to stdout.
Next, we have two print statements. The results are interesting. The two print statements...