{"id":4119,"date":"2023-10-18T18:17:36","date_gmt":"2023-10-18T09:17:36","guid":{"rendered":"https:\/\/dennie.tokyo\/it\/?p=4119"},"modified":"2025-07-10T19:22:25","modified_gmt":"2025-07-10T10:22:25","slug":"%e3%80%90go%e3%80%91%e3%82%a8%e3%83%a9%e3%83%bc%e5%87%a6%e7%90%86%e3%81%ae%e5%9f%ba%e6%9c%ac","status":"publish","type":"post","link":"https:\/\/dennie.tokyo\/it\/?p=4119","title":{"rendered":"\u3010Go\u3011\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u57fa\u672c"},"content":{"rendered":"\n

Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u57fa\u672c\u306b\u3064\u3044\u3066\u3002<\/p>\n\n\n\n\n\n\n\n

\u57fa\u672c<\/h1>\n\n\n\n

\u30a8\u30e9\u30fc\u51fa\u529b<\/h2>\n\n\n\n

errors.New\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30a8\u30e9\u30fc\u3092\u8868\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n

package main\n\nimport (\n\t"errors"\n\t"fmt"\n)\n\nfunc main() {\n\terr := errors.New("\u30a8\u30e9\u30fc\u3060\u3088\uff01\uff01")\n\tfmt.Println(err.Error())  \/\/ \u30a8\u30e9\u30fc\u3060\u3088\uff01\uff01 \u304c\u8868\u793a\u3055\u308c\u308b\u3002\n\n\t\/\/ \u4ee5\u4e0b\u306e\u65b9\u304c\u4e00\u822c\u7684\n\t\/\/fmt.Println(err)\n}\n<\/code><\/pre><\/div>\n\n\n\n
fmt.Errorf\u95a2\u6570\u3067\u3082\u826f\u3044\u3067\u3059\u3002\u3053\u3061\u3089\u306f “%s” \u3068\u304b\u51fa\u529b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u95a2\u9023\u306e\u52d5\u8a5e\u304c\u4f7f\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
package main\n\nimport (\n\t"fmt"\n)\n\nfunc main() {\n\terr := fmt.Errorf("Error: %s", "\u30a8\u30e9\u30fc\u3060\u3088\uff01\uff01")\n\tfmt.Println(err) \/\/ Error: \u30a8\u30e9\u30fc\u3060\u3088\uff01\uff01 \u304c\u8868\u793a\u3055\u308c\u308b\u3002\n}\n<\/code><\/pre><\/div>\n\n\n\n
\u30a8\u30e9\u30fc\u306e\u30e9\u30c3\u30d4\u30f3\u30b0<\/h1>\n\n\n\n
\u30a8\u30e9\u30fc\u306f\u30a8\u30e9\u30fc\u3092\u30e9\u30c3\u30d4\u30f3\u30b0\u3059\u308b\u4e8b\u304c\u3067\u304d\u307e\u3059\u3002
fmt.Errorf\u95a2\u6570\u306b\u3066 “%w” \u3092\u4f7f\u3044\u307e\u3059\u3002\u307e\u305f\u30e9\u30c3\u30d4\u30f3\u30b0\u3055\u308c\u305f\u30a8\u30e9\u30fc\u53d6\u5f97\u3059\u308b\u306b\u306fUnwrap\u95a2\u6570\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n
package main\n\nimport (\n\t"errors"\n\t"fmt"\n)\n\nfunc returnError() error {\n\torgErr := errors.New("\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30a8\u30e9\u30fc\u3060\u3088")\n\treturn fmt.Errorf("\u30a8\u30e9\u30fc\u3092\u30e9\u30c3\u30d7\u3057\u307e\u3057\u305f\u3002\u5143\u306e\u30a8\u30e9\u30fc\u306f %w", orgErr)\n}\n\nfunc main() {\n\t\/\/ \u30e9\u30c3\u30d7\u3055\u308c\u305f\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308b\n\treErr := returnError()\n\n\t\/\/ \u30a8\u30e9\u30fc\u3092\u30a2\u30f3\u30e9\u30c3\u30d7\u3057\u3066\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30a8\u30e9\u30fc\u3092\u53d6\u5f97\u3059\u308b\n\torgErr := errors.Unwrap(reErr)\n\n\tfmt.Println(orgErr) \/\/ \u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30a8\u30e9\u30fc\u3060\u3088 \u304c\u8868\u793a\u3055\u308c\u308b\n}\n<\/code><\/pre><\/div>\n\n\n\n
\u3057\u304b\u3057\u3001Unwrap\u95a2\u6570\u3092\u4f7f\u3046\u3053\u3068\u306f\u3042\u307e\u308a\u3042\u308a\u307e\u305b\u3093\u3002<\/p>\n\n\n\n
\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc<\/h1>\n\n\n\n
\u30a8\u30e9\u30fc\u306f\u81ea\u5206\u3067\u4f5c\u6210\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n
\u5b9f\u614b<\/h2>\n\n\n\n
errors.New\u95a2\u6570\u3084fmt.Errorf\u95a2\u6570\u3067\u53d7\u3051\u53d6\u308berr\u306e\u6b63\u4f53\u306ferror\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3067\u3059\u3002\u306a\u306e\u3067\u3001error\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3059\u308c\u3070\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u304c\u4f5c\u308c\u307e\u3059\u3002<\/p>\n\n\n\n
type error interface {\n    Error() string\n}<\/code><\/pre><\/div>\n\n\n\n
\u5b9f\u88c5<\/h2>\n\n\n\n
\u7121\u7406\u3084\u308a\u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u3092\u4f5c\u6210\u3057\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n
package main\n\nimport (\n\t"errors"\n\t"fmt"\n)\n\ntype MyError struct{}\n\nfunc (em MyError) Error() string {\n\treturn "\u4ffa\u306e\u30a8\u30e9\u30fc\uff01\uff01"\n}\n\nfunc returnError() error {\n\treturn fmt.Errorf("\u30a8\u30e9\u30fc\u3092\u30e9\u30c3\u30d7\u3057\u307e\u3057\u305f\u3002\u5143\u306e\u30a8\u30e9\u30fc\u306f %w", MyError{})\n}\n\nfunc main() {\n\t\/\/ \u30e9\u30c3\u30d7\u3055\u308c\u305f\u30a8\u30e9\u30fc\u3092\u53d7\u3051\u53d6\u308b\n\treErr := returnError()\n\n\t\/\/ \u30a8\u30e9\u30fc\u3092\u30a2\u30f3\u30e9\u30c3\u30d7\u3057\u3066\u30aa\u30ea\u30b8\u30ca\u30eb\u306e\u30a8\u30e9\u30fc\u3092\u53d6\u5f97\u3059\u308b\n\torgErr := errors.Unwrap(reErr)\n\n\tfmt.Println(orgErr) \/\/ \u4ffa\u306e\u30a8\u30e9\u30fc\uff01\uff01 \u304c\u8868\u793a\u3055\u308c\u308b\n}\n<\/code><\/pre><\/div>\n","protected":false},"excerpt":{"rendered":"
Go\u306e\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u57fa\u672c\u306b\u3064\u3044\u3066\u3002<\/p>\n","protected":false},"author":1,"featured_media":5,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[33],"tags":[],"class_list":["post-4119","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-go"],"_links":{"self":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4119","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4119"}],"version-history":[{"count":13,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4119\/revisions"}],"predecessor-version":[{"id":4159,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/posts\/4119\/revisions\/4159"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=\/wp\/v2\/media\/5"}],"wp:attachment":[{"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4119"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4119"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dennie.tokyo\/it\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4119"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}