聊聊golang的defer的使用

// f returns 42
func f() (result int) {
  defer func() {
    // result is accessed after it was set to 6 by the return statement
    result *= 7
  }()
  return 6
}

func f() int {
  result := 6
  defer func() {
    // result is accessed after it was set to 6 by the return statement
    result *= 7
  }()
  return result
}

func multiDefer() {
  for i := 3; i > 0; i-- {
    defer func(n int) {
      fmt.Print(n, " ")
    }(i)
  }

  for i := 3; i > 0; i-- {
    defer fmt.Print(i, " ")
  }
}

var fc func() string

func main() {
  fmt.Println("hello")
  defer fc()
}

func main() {
  for i := 3; i > 0; i-- {
    defer func() {
      fmt.Print(i, " ")
    }()
  }
}