defer

package main

import "fmt"

import "os"

func main() {

    f := createFile("/tmp/defer.txt")

    defer closeFile(f)

    writeFile(f)

}

func createFile(p string) *os.File {

    fmt.Println("creating")

    f, err := os.Create(p)

    if err != nil {

        panic(err)

    }

    return f

}

func writeFile(f *os.File) {

    fmt.Println("writing")

    fmt.Fprintln(f, "data")

}

func closeFile(f *os.File) {

    fmt.Println("closing")

    f.Close()

}