{"id":448,"date":"2026-05-05T15:16:17","date_gmt":"2026-05-05T06:16:17","guid":{"rendered":"https:\/\/www.zeronana.net\/?p=448"},"modified":"2026-05-06T15:43:41","modified_gmt":"2026-05-06T06:43:41","slug":"go-%e3%82%a8%e3%83%a9%e3%83%bc%e3%83%8f%e3%83%b3%e3%83%89%e3%83%aa%e3%83%b3%e3%82%b0%ef%bd%9cerror%e5%87%a6%e7%90%86%e3%81%ae%e5%9f%ba%e6%9c%ac%e3%81%a8%e5%ae%9f%e8%a3%85%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.zeronana.net\/?p=448","title":{"rendered":"Go \u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\uff5cerror\u51e6\u7406\u306e\u57fa\u672c\u3068\u5b9f\u88c5\u65b9\u6cd5"},"content":{"rendered":"\n

Go\u8a00\u8a9e\u3067\u306f\u3001\u30a8\u30e9\u30fc\u51e6\u7406\u306b error<\/code> \u578b<\/strong> \u3092\u4f7f\u3044\u307e\u3059\u3002
Java\u3084PHP\u306e\u3088\u3046\u306b\u4f8b\u5916\u51e6\u7406\u3092\u4e2d\u5fc3\u306b\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u623b\u308a\u5024\u3068\u3057\u3066\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308a\u3001\u3059\u3050\u78ba\u8a8d\u3059\u308b<\/strong> \u306e\u304c\u57fa\u672c\u3067\u3059\u3002<\/p>\n\n\n\n

\n\n\n\n

Go\u306eerror\u51e6\u7406\u306e\u57fa\u672c<\/h2>\n\n\n\n
result, err := doSomething()

if err != nil {
    fmt.Println(\"\u30a8\u30e9\u30fc:\", err)
    return
}

fmt.Println(result)<\/code><\/pre>\n\n\n\n
Go\u3067\u306f\u3053\u306e\u5f62\u304c\u3068\u3066\u3082\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n
if err != nil {
    \/\/ \u30a8\u30e9\u30fc\u6642\u306e\u51e6\u7406
}<\/code><\/pre>\n\n\n\n
\n\n\n\n
error\u3092\u8fd4\u3059\u95a2\u6570\u306e\u4f5c\u308a\u65b9<\/h2>\n\n\n\n
package main

import (
    \"errors\"
    \"fmt\"
)

func divide(a int, b int) (int, error) {
    if b == 0 {
        return 0, errors.New(\"0\u3067\u5272\u308b\u3053\u3068\u306f\u3067\u304d\u307e\u305b\u3093\")
    }

    return a \/ b, nil
}

func main() {
    result, err := divide(10, 0)

    if err != nil {
        fmt.Println(\"\u30a8\u30e9\u30fc:\", err)
        return
    }

    fmt.Println(\"\u7d50\u679c:\", result)
}<\/code><\/pre>\n\n\n\n
\n\n\n\n
fmt.Errorf\u3067\u8a73\u3057\u3044\u30a8\u30e9\u30fc\u3092\u4f5c\u308b<\/h2>\n\n\n\n
package main

import (
    \"fmt\"
)

func findUser(id int) error {
    if id <= 0 {
        return fmt.Errorf(\"\u4e0d\u6b63\u306a\u30e6\u30fc\u30b6\u30fcID\u3067\u3059: %d\", id)
    }

    return nil
}

func main() {
    err := findUser(0)

    if err != nil {
        fmt.Println(err)
    }
}<\/code><\/pre>\n\n\n\n
\n\n\n\n
\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u3046\u66f8\u304d\u65b9<\/h2>\n\n\n\n
file, err := os.Open(\"sample.txt\")
if err != nil {
    return err
}
defer file.Close()<\/code><\/pre>\n\n\n\n
\u30dd\u30a4\u30f3\u30c8\u306f\u3001\u30a8\u30e9\u30fc\u304c\u8d77\u304d\u305f\u3089\u65e9\u3081\u306breturn\u3059\u308b<\/strong>\u3053\u3068\u3067\u3059\u3002
\u3053\u308c\u3092 \u65e9\u671f\u30ea\u30bf\u30fc\u30f3<\/strong> \u3068\u3044\u3044\u307e\u3059\u3002<\/p>\n\n\n\n
\n\n\n\n
Web API\u3067\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u4f8b<\/h2>\n\n\n\n
func handler(w http.ResponseWriter, r *http.Request) {
    user, err := getUser()

    if err != nil {
        http.Error(w, \"\u30e6\u30fc\u30b6\u30fc\u53d6\u5f97\u306b\u5931\u6557\u3057\u307e\u3057\u305f\", http.StatusInternalServerError)
        return
    }

    json.NewEncoder(w).Encode(user)
}<\/code><\/pre>\n\n\n\n
Web\u958b\u767a\u3067\u306f\u3001\u30a8\u30e9\u30fc\u5185\u5bb9\u306b\u5fdc\u3058\u3066HTTP\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
\n\n\n\n
\u307e\u3068\u3081<\/h2>\n\n\n\n
Go\u306e\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306f\u3001\u6b21\u306e\u5f62\u3092\u899a\u3048\u308c\u3070OK\u3067\u3059\u3002<\/p>\n\n\n\n
if err != nil {
    return err
}<\/code><\/pre>\n\n\n\n
\u521d\u5fc3\u8005\u306f\u307e\u305a\u3001
\u300c\u95a2\u6570\u306f\u5024\u3068error\u3092\u8fd4\u3059\u300d<\/strong>
\u300cerr\u304cnil\u3067\u306a\u3051\u308c\u3070\u30a8\u30e9\u30fc\u300d<\/strong>
\u3053\u306e2\u3064\u3092\u7406\u89e3\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Go\u8a00\u8a9e\u3067\u306f\u3001\u30a8\u30e9\u30fc\u51e6\u7406\u306b error \u578b \u3092\u4f7f\u3044\u307e\u3059\u3002Java\u3084PHP\u306e\u3088\u3046\u306b\u4f8b\u5916\u51e6\u7406\u3092\u4e2d\u5fc3\u306b\u3059\u308b\u306e\u3067\u306f\u306a\u304f\u3001\u623b\u308a\u5024\u3068\u3057\u3066\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308a […]<\/p>\n","protected":false},"author":1,"featured_media":449,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"advanced_seo_description":"","jetpack_seo_html_title":"","jetpack_seo_noindex":false,"jetpack_seo_schema_type":"","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4],"tags":[6,7],"class_list":["post-448","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-go","tag-go-2","tag-go"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"https:\/\/www.zeronana.net\/wp-content\/uploads\/2026\/05\/\u5b9f\u52d9.png","_links":{"self":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/448","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=448"}],"version-history":[{"count":1,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/448\/revisions"}],"predecessor-version":[{"id":450,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/posts\/448\/revisions\/450"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=\/wp\/v2\/media\/449"}],"wp:attachment":[{"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=448"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=448"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zeronana.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}