Go defer

1 개요

A defer statement defers the execution of a function until the surrounding function returns.

The deferred call's arguments are evaluated immediately, but the function call is not executed until the surrounding function returns.

package main

import "fmt"

func main() {
	defer fmt.Println("world")

	fmt.Println("hello")
}

Deferred function calls are pushed onto a stack. When a function returns, its deferred calls are executed in last-in-first-out order.

To learn more about defer statements read this blog post.

package main

import "fmt"

func main() {
	fmt.Println("counting")

	for i := 0; i < 10; i++ {
		defer fmt.Println(i)
	}

	fmt.Println("done")
}