[GO] 자료구조 - map/dictionary

자료구조 - map{ string:string }

 

\mydict\mydict.go

 

 

package mydict

import "errors"

// Doctionary map
type Dictionary map[string]string

var errNotFound = errors.New("not found")
var errWordExists = errors.New("that word already exists")
var errCantUpdate = errors.New("can not update, non-existing word")

// Search for a word
func (d Dictionary) Search(word string) (string, error) {
	v, exists := d[word]
	if exists {
		return v, nil
	} else {
		return "", errNotFound
	}
}

// Add a word to dictionary
func (d Dictionary) Add(word, def string) error {
	_, err := d.Search(word)

	switch err {
	case errNotFound:
		d[word] = def
	case nil:
		return errWordExists
	}

	return nil
}

// Update definition of a word
func (d Dictionary) Update(word, def string) error {
	_, err := d.Search(word)

	switch err {
	case nil:
		d[word] = def
	case errNotFound:
		return errCantUpdate
	}

	return nil
}

// Delete a word
func (d Dictionary) Delete(word string) {
	delete(d, word)
}

 

\main.go

 

package main

import (
	"GO/nomad/mydict"
	"fmt"
)

func main() {
	dictionary := mydict.Dictionary{}
	fmt.Println("init:", dictionary)

	word := "hello"
	dictionary.Add(word, "First")
	fmt.Println("after Add:", dictionary)
	fmt.Println()

	err1 := dictionary.Update(word, "Second")
	if err1 == nil {
		fmt.Println("after update(Second):", dictionary)
	} else {
		fmt.Printf("update error: %s \n", err1)
	}

	// update error case
	err1 = dictionary.Update("word", "Second")
	if err1 == nil {
		fmt.Println("after update(Second):", dictionary)
	} else {
		fmt.Printf("update error: %s \n", err1)
	}
	fmt.Println()

	result, _ := dictionary.Search(word)
	fmt.Printf("search(%s) result: %s\n", word, result)

	// delete
	dictionary.Delete(word)
	result, err := dictionary.Search(word)
	if err != nil {
		fmt.Printf("err >>> can not find '%s' and error code is '%s'", word, err)
	} else {
		fmt.Printf("definition(%s): %s", word, result)
	}
}

 

[Running] go run "d:\workspace\GO\nomad\main.go"
init: map[]
after Add: map[hello:First]

after update(Second): map[hello:Second]
update error: can not update, non-existing word 

search(hello) result: Second
err >>> can not find 'hello' and error code i

 

참고자료 [https://youtu.be/Rt8o1T1fDMo]