a.go

//refer: http://localhost:6060/blog/defer-panic-and-recover
package main

import (
	"fmt"
)

//1. A deferred function's arguments are evaluated when the defer statement is evaluated.
func a() {
	i := 0
	defer fmt.Println(i)
	i++
	return
}

//2. Deferred function calls are executed in Last In First Out order after_the surrounding function returns.
func b() {
	for i := 0; i < 4; i++ {
		defer fmt.Println(i)
	}
}

//3. Deferred functions may read and assign to the returning function's named return values.
func c() (i int) {
	defer func() { i++ }()

	return 1
}

func main() {

	a()
	b()
	fmt.Println(c())

}