Defer usage clarification

Question

Let\'s assume I have the following function

func printNumbers(){
 var x int

 defer fmt.Println(x)

 for i := 0; i < 5; i++{
  x++
 }
}

Answer 1

If the defer has arguments they are evaluated at the line of the defer-statement; this is illustrated in the following snippet, where the defer will print 0:

func printNumber() {
   i := 0
   defer fmt.Println(i) // will print 0
   i++
   return
}

You can use an anonymous function as a defer statement if you want to postpone the execution of a statement or a function until the end of the enclosing (calling) function. Here is an updated example:

func printNumbers() {
    x := 0
    defer func() { fmt.Println(x) }()
    for i:=0; i < 5; i++ {
        x++;
    }
    return
}

http://play.golang.org/p/YQGQ_8a0_9