Go - back on your feet - Recovering from Failure - deffered function calls

開発環境

Head First Go、 Jay McGavren(著)、O’Reilly Media)の Chapter 12(back on your feet - Recovering from Failure)、p.356(Code Magnets)の解答を求めてみる。

コード

main.go

package main

import (
	"fmt"
	"log"
)

func find(item string, slice []string) bool {
	for _, sliceItem := range slice {
		if item == sliceItem {
			return true
		}
	}
	return false
}

type Refrigerator []string

func (r Refrigerator) Open() {
	fmt.Println("Opening refrigerator")
}
func (r Refrigerator) Close() {
	fmt.Println("Closing refrigerator")
}
func (r Refrigerator) FindFood(food string) error {
	r.Open()
	defer r.Close()
	if find(food, r) {
		fmt.Println("Found", food)
	} else {
		return fmt.Errorf("%s not found", food)
	}
	return nil
}
func main() {
	fridge := Refrigerator{"Milk", "Pizza", "Salasa"}
	for _, food := range []string{"Milk", "Bananas"} {
		err := fridge.FindFood(food)
		if err != nil {
			log.Fatal(err)
		}
	}
}

入出力結果(Terminal, Zsh)

% go run main.go
Opening refrigerator
Found Milk
Closing refrigerator
Opening refrigerator
Closing refrigerator
2025/01/18 16:45:22 Bananas not found
exit status 1
%