{"id":44151,"date":"2022-12-04T14:54:16","date_gmt":"2023-05-30T20:29:53","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90golang%e3%80%91%e4%ba%86%e8%a7%a3golang%e4%b8%ad%e7%9a%84%e6%8e%a5%e5%8f%a3interface%e7%9a%84%e5%b0%8f%e7%aa%8d%e9%97%a8%e5%be%88%e6%9c%89%e7%9b%8a%e5%a4%84\/"},"modified":"2024-04-29T03:41:45","modified_gmt":"2024-04-28T19:41:45","slug":"%e3%80%90golang%e3%80%91%e4%ba%86%e8%a7%a3golang%e4%b8%ad%e7%9a%84%e6%8e%a5%e5%8f%a3interface%e7%9a%84%e5%b0%8f%e7%aa%8d%e9%97%a8%e5%be%88%e6%9c%89%e7%9b%8a%e5%a4%84","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e3%80%90golang%e3%80%91%e4%ba%86%e8%a7%a3golang%e4%b8%ad%e7%9a%84%e6%8e%a5%e5%8f%a3interface%e7%9a%84%e5%b0%8f%e7%aa%8d%e9%97%a8%e5%be%88%e6%9c%89%e7%9b%8a%e5%a4%84\/","title":{"rendered":"\u3010Golang\u3011\u4e86\u89e3Golang\u4e2d\u7684\u63a5\u53e3(interface)\u7684\u5c0f\u7a8d\u95e8\u5f88\u6709\u76ca\u5904"},"content":{"rendered":"<h2>\u7b80\u800c\u8a00\u4e4b<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u53bb\u5e74\u306e8\u6708\u306b\u793e\u4f1a\u4eba\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u306a\u308a\u3001\u4eca\u5e74\u306e2\u6708\u307e\u3067API\u30b5\u30fc\u30d0\u30fc\u306e\u958b\u767a\u3092Ruby on Rails\u3067\u884c\u306a\u3063\u3066\u3044\u305f\u65b0\u5352Rubyist\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">3\u6708\u306b\u30b5\u30fc\u30d0\u30fc\u30b5\u30a4\u30c9\u3092\u5168\u3066Golang\u3067\u884c\u3046\u4f1a\u793e\u306b\u8ee2\u8077\u3057\u307e\u3057\u305f\u3002\u4eca\u307e\u3067Rails\u3067\u306e\u696d\u52d9\u304c\u591a\u304b\u3063\u305f\u305f\u3081\u3001interface{}\u3068\u3044\u3046\u6982\u5ff5\u304c\u3069\u3046\u3057\u3066\u3082\u8eab\u306b\u3064\u304d\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u3042\u308b\u7a0b\u5ea6\u696d\u52d9\u306b\u6163\u308c\u3001\u6226\u3044\u7d9a\u3051\u3066\u5b66\u3093\u3060\u3053\u3068\u3092\u307e\u3068\u3081\u3088\u3046\u3068\u601d\u3044\u307e\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">Golang\u306einterface\u306b\u3064\u3044\u3066\u306f\u77e5\u898b\u306f\u591a\u304f\u3042\u308b\u306e\u3067\u3059\u304c\u3001\u4eca\u5e74\u306f\u30a2\u30a6\u30c8\u30d7\u30c3\u30c8\u3092\u5927\u4e8b\u306b\u3057\u3066\u3044\u304d\u305f\u3044\u3068\u3044\u3046\u76ee\u6a19\u304b\u3089\u3001\u8a18\u4e8b\u306b\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/ul>\n<h2>\u5728\u5f00\u59cb\u9605\u8bfb\u4e4b\u524d\u5f80\u4e0b\u770b<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">Golang\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u306f\u578b\u306e\uff11\u3064\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>string \u3084 int64 \u304c\u95a2\u6570\u3092\u6301\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3067\u578b\u3092\u5ba3\u8a00\u3057\u3066\u305d\u306e\u578b\u306b\u95a2\u6570\u3092\u6301\u305f\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u69cb\u9020\u4f53\u304c\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3067\u5ba3\u8a00\u3055\u308c\u3066\u3044\u308bGetRadius\u95a2\u6570\u3092\u6301\u3064\u3068\u3001\u3053\u306e\u69cb\u9020\u4f53\u306e\u578b\u306fCircle\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span><span class=\"p\">(<\/span>\r\n     <span class=\"n\">Circle<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{<\/span>\r\n          <span class=\"n\">GetRadius<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int64<\/span>\r\n     <span class=\"p\">}<\/span>\r\n\r\n     <span class=\"n\">CircleImpl<\/span> <span class=\"k\">struct<\/span><span class=\"p\">{}<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"c\">\/\/ NewCircle \u304c `GetRaidus`\u95a2\u6570\u3092\u6301\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u578b\u306f`Circle`\u306b\u306a\u308b\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewCircle<\/span><span class=\"p\">()<\/span> <span class=\"o\">*<\/span><span class=\"n\">CircleImpl<\/span> <span class=\"p\">{<\/span>\r\n     <span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">CircleImpl<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">CircleImpl<\/span><span class=\"p\">)<\/span> <span class=\"n\">GetRadius<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">{<\/span>\r\n     <span class=\"k\">return<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">1<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u719f\u6089Golang\u7684\u4eba\u53ef\u80fd\u8ba4\u4e3a\u8fd9\u662f\u7406\u6240\u5f53\u7136\u7684\uff0c\u4f46\u5bf9\u4e8e\u4e0d\u4f7f\u7528interface{}\u6982\u5ff5\u7684Ruby\u5f00\u53d1\u8005\u6765\u8bf4\uff0c\u7406\u89e3\u548c\u4e0d\u7406\u89e3\u4e0a\u8ff0\u8981\u70b9\u4e4b\u95f4\u5b58\u5728\u5f88\u5927\u5dee\u5f02\uff0c\u56e0\u6b64\u6211\u5c06\u5176\u5199\u5728\u6587\u7ae0\u7684\u6700\u4e0a\u65b9\u3002\u57fa\u4e8e\u8fd9\u4e9b\uff0c\u6211\u8ba4\u4e3a\u6df1\u5165\u7406\u89e3interface{}\u5f88\u91cd\u8981\u3002<\/p>\n<h1>\u7ee7\u7eed\u6218\u6597\u6211\u5b66\u5230\u7684\u6559\u8bad<\/h1>\n<h2>1. \u4e0d\u7ba1\u662f\u4ec0\u4e48\u7c7b\u578b\u7684\uff0c\u90fd\u80fd\u63a5\u7eb3\u7684\u6742\u8d27\u5e97\u3002<\/h2>\n<ul class=\"post-ul\">Golang\u306einterface\u3067\u306f\u3069\u3093\u306a\u578b\u3067\u3082\u53d7\u3051\u53d6\u308c\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n  <span class=\"n\">intValue<\/span> <span class=\"o\">:=<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">10<\/span><span class=\"p\">)<\/span> \r\n  <span class=\"n\">strValue<\/span> <span class=\"o\">:=<\/span> <span class=\"s\">\"go interface\"<\/span>\r\n  <span class=\"n\">PrintAnyType<\/span><span class=\"p\">(<\/span><span class=\"n\">intValue<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; 10<\/span>\r\n  <span class=\"n\">PrintAnyType<\/span><span class=\"p\">(<\/span><span class=\"n\">strValue<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; \"go interface\" <\/span>\r\n\r\n  <span class=\"k\">var<\/span> <span class=\"n\">interface1<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span> <span class=\"o\">=<\/span> <span class=\"s\">\"interface1\"<\/span>\r\n  <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">interface1<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; interface1<\/span>\r\n  <span class=\"n\">interface1<\/span> <span class=\"o\">=<\/span> <span class=\"kt\">uint8<\/span><span class=\"p\">(<\/span><span class=\"m\">2<\/span><span class=\"p\">)<\/span>\r\n  <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">interface1<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; 2 <\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"c\">\/\/ PrintAnyType print any type of variable.<\/span>\r\n<span class=\"c\">\/\/ \u5f15\u6570\u306e\u578b\u304cinterface{}\u3067\u3042\u308b\u305f\u3081\u306b\u3001\u3069\u3093\u306a\u578b\u306e\u5909\u6570\u3067\u3082PrintAnyType\u95a2\u6570\u306f\u53d7\u3051\u5165\u308c\u3066\u304f\u308c\u308b\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">PrintAnyType<\/span><span class=\"p\">(<\/span><span class=\"n\">variable<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}){<\/span>\r\n  <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">variable<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u306a\u3093\u3067\u3053\u308c\u3092\u66f8\u3053\u3046\u3068\u601d\u3063\u305f\u304b\u3068\u3044\u3046\u3068\u3001\u4eca\u307e\u3067\u52d5\u7684\u8a00\u8a9e\u3067\u306eAPI\u30b5\u30fc\u30d0\u30fc\u306e\u958b\u767a\u304c\u591a\u304b\u3063\u305f\u305f\u3081\u3001\u300c\u578b\u304c\u5b58\u5728\u3059\u308b\u8a00\u8a9e\u3067JSON\u3092\u8fd4\u3059\u3068\u304d\u306e\u51e6\u7406\u3063\u3066\u3069\u3046\u306a\u3063\u3066\u3044\u308b\u3060\u308d\uff1f\u300d\u3068\u601d\u3063\u305f\u3068\u3053\u308d\u3001\u6c17\u306b\u306a\u3063\u3066\u4f1a\u793e\u306e\u30b3\u30fc\u30c9\u3092\u8abf\u3079\u3066\u3001\u4e0b\u306e\u30b3\u30fc\u30c9\u3092\u898b\u3064\u3051\u305f\u306e\u304c\u304d\u3063\u304b\u3051\u3067\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u4e0b\u306e\u3088\u3046\u306b\u30de\u30c3\u30d7\u306e\u30ad\u30fc\u306f string \u3060\u3051\u3069\u3001 \u5024\u306finterface{} \u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u3044\u3061\u3044\u3061\u5024\u306e\u578b\u3092\u3059\u3079\u3066\uff11\u3064\u306e\u578b\u306b\u63c3\u3048\u308b\u5fc5\u8981\u304c\u306a\u304f\u3001JSON\u3092\u4f5c\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u306e\u304b\u3068\u7d0d\u5f97\u3057\u307e\u3057\u305f\u3002(\u4f1a\u793e\u3067\u306f\u3001echo\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u3063\u3066\u3044\u307e\u3059\u3002\uff09<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">func<\/span> <span class=\"n\">JSONHTTPSuccessHandler<\/span><span class=\"p\">(<\/span><span class=\"n\">data<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{},<\/span> <span class=\"n\">c<\/span> <span class=\"n\">echo<\/span><span class=\"o\">.<\/span><span class=\"n\">Context<\/span><span class=\"p\">)<\/span> <span class=\"kt\">error<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">c<\/span><span class=\"o\">.<\/span><span class=\"n\">JSON<\/span><span class=\"p\">(<\/span><span class=\"n\">http<\/span><span class=\"o\">.<\/span><span class=\"n\">StatusOK<\/span><span class=\"p\">,<\/span> <span class=\"n\">data<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5f53\u4e00\u4e2a\u7ed3\u6784\u4f53\u5177\u6709\u63a5\u53e3\u7c7b\u578b\u65f6\uff0c\u539f\u672c\u7684\u7c7b\u578b\u4fe1\u606f\u3001\u7ed3\u6784\u4f53\u7684\u65b9\u6cd5\u548c\u5b57\u6bb5\u5c06\u4f1a\u6d88\u5931\u3002<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4e0a\u306e1\u307f\u305f\u3044\u306b\u3001interface{}\u578b\u3067\u5ba3\u8a00\u3055\u308c\u3066\u3044\u308b\u5909\u6570\u306b\u5024\u3092\u4ee3\u5165\u3057\u3066\u3001\u578b\u306b\u6cbf\u3063\u305f\u901a\u308a\u306e\u52d5\u304d\u3092\u3057\u3066\u304f\u308c\u308b\u3068\u601d\u3063\u305f\u3068\u3053\u308d\u3001\u4e0b\u306e\u3088\u3046\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u305f\u3068\u304d\u306b\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u3089\u306a\u3044\u3063\u3066\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u306a\u305c\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u3089\u306a\u3044\u304b\u3068\u3044\u3046\u3068\u3001strSliceInterface\u306fJoin\u95a2\u6570\u306e\u5f15\u6570\u3068\u3057\u3066\u6e21\u305b\u308c\u308b\u3068\u304d\u306b\u578b\u304cinterface{}\u3068\u306a\u3063\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\u305d\u306e\u305f\u3081\u3001strings.Join\u304c\u671f\u5f85\u3057\u3066\u3044\u308b []string{} \u3068\u306f\u306a\u3089\u305a\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u3066\u3057\u307e\u3044\u307e\u3059\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"strings\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">strSliceInterface<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">strSliceInterface<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span><span class=\"s\">\"hoge\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"fuga\"<\/span><span class=\"p\">}<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">strings<\/span><span class=\"o\">.<\/span><span class=\"n\">Join<\/span><span class=\"p\">(<\/span><span class=\"n\">strSliceInterface<\/span><span class=\"p\">,<\/span> <span class=\"s\">\", \"<\/span><span class=\"p\">))<\/span> \r\n    <span class=\"c\">\/\/ =&gt; cannot use strSliceInterface (type interface {}) as type []string in argument to strings.Join: need type assertion<\/span>\r\n    <span class=\"c\">\/\/ =&gt; \u30a8\u30e9\u30fc\u6587\u304c\u8a00\u3063\u3066\u3044\u308b\u3088\u3046\u306b\u3001strSliceInterface\u306e\u578b\u306f`interface{}`\u3068\u306a\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u671f\u5f85\u3057\u3066\u3044\u308b\u578b\u304c\u6e21\u3055\u308c\u3066\u3044\u306a\u3044\u3002<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\u3000interface{}\u304c\u306a\u3093\u3067\u3082\u5c4b\u3055\u3093\u3067\u3042\u308b\u304c\u3086\u3048\u3001\u305f\u3060\u4ee3\u5165\u3059\u308b\u3068\u304d\u306f\u30b3\u30f3\u30d1\u30a4\u30eb\u304c\u901a\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u5b9f\u969b\u306b\u4f7f\u7528\u3059\u308b\u3068\u306a\u3063\u305f\u3068\u304d\u306f\u3001\u578b\u304cinterface{}\u306b\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3001\u6c17\u3092\u3064\u3051\u307e\u3057\u3087\u3046\u3002<\/ul>\n<h2>\u5c06\u4e00\u4e2a\u53d8\u91cf\u8d4b\u503c\u4e3ainterface{}\uff0c\u4ee5\u81f3\u4e8e\u4e22\u5931\/\u6ca1\u6709\u4e0b\u9762\u7c7b\u578b\u7684\u4fe1\u606f\uff0c\u7136\u540e\u5c06\u8be5\u53d8\u91cf\u6062\u590d\u4e3a\u539f\u6765\u7684\u7c7b\u578b\u7684\u65b9\u6cd5\u662f\u4ec0\u4e48\uff1f<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">2.\u306e\u3088\u3046\u306b\u3001\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u3068\u304d\u306finterface{} \u3092\u4f7f\u3063\u3066\u3057\u307e\u3063\u305f\u3051\u308c\u3069\u3001interface{}\u3068\u3057\u3066\u4ee3\u5165\u3059\u308b\u524d\u306e\u578b\u3092\u53d6\u308a\u623b\u3057\u305f\u3044\u3068\u3044\u3046\u3068\u304d\u306b\u306f\u3001\u5909\u6570.(\u578b)\u3068\u66f8\u304f\u3053\u3068\u3067\u578b\u306e\u60c5\u5831\u3092\u53d6\u308a\u623b\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u4e0a\u306einterface4.go\u306b\u3001 strSlice := strSliceInterface.([]string) \u3068\u52a0\u3048\u308b\u3053\u3068\u3067strSlice\u306b[]string\u306e\u578b\u3092\u6e21\u305b\u307e\u3059\u3002<\/p>\n<p>\u3053\u308c\u3092 Type Assertion \u3068\u8a00\u3044\u307e\u3059\u3002<br \/>\n\u578b\u5909\u63db\u304c\u4e0a\u624b\u304f\u3044\u3063\u305f\u304b\u3069\u3046\u304b\u3092\u3057\u3063\u304b\u308a\u8abf\u3079\u308b\u305f\u3081\u306b\u3001ok(bool)\u304c true \u306b\u306a\u3063\u3066\u3044\u308b\u304b\u3092\u3057\u3063\u304b\u308a\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"strings\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">strSliceInterface<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">strSliceInterface<\/span> <span class=\"o\">=<\/span> <span class=\"p\">[]<\/span><span class=\"kt\">string<\/span><span class=\"p\">{<\/span><span class=\"s\">\"hoge\"<\/span><span class=\"p\">,<\/span> <span class=\"s\">\"fuga\"<\/span><span class=\"p\">}<\/span>\r\n    <span class=\"n\">strSlice<\/span><span class=\"p\">,<\/span> <span class=\"n\">ok<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">strSliceInterface<\/span><span class=\"o\">.<\/span><span class=\"p\">([]<\/span><span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; string\u306e\u30b9\u30e9\u30a4\u30b9\u306b\u623b\u3057\u3066\u3044\u308b\u3002 <\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">ok<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; true \u3053\u3053\u304c false\u306e\u3068\u304d\u306f\u3001type assertion\u306f\u5931\u6557\u3057\u3066\u3044\u308b\u3002<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">ok<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"type assertion succeeded.\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">strings<\/span><span class=\"o\">.<\/span><span class=\"n\">Join<\/span><span class=\"p\">(<\/span><span class=\"n\">strSlice<\/span><span class=\"p\">,<\/span> <span class=\"s\">\", \"<\/span><span class=\"p\">))<\/span> <span class=\"c\">\/\/ =&gt; hoge, fuga<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h3>\u5e94\u7528<\/h3>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u4e0a\u306eType Assertion\u306e\u5fdc\u7528\u304cTour of Go\u306b\u3042\u308b\u305f\u3081\u3001\u305d\u308c\u3092\u53c2\u8003\u306b\u3057\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>switch + interface{}.(type) \u3067\u671f\u5f85\u3057\u3066\u3044\u308b\u578b\u304c\u6e21\u3063\u3066\u304d\u305f\u3068\u304d\u306b\u7279\u5b9a\u306e\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"fmt\"<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">do<\/span><span class=\"p\">(<\/span><span class=\"n\">i<\/span> <span class=\"k\">interface<\/span><span class=\"p\">{})<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">switch<\/span> <span class=\"n\">v<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">i<\/span><span class=\"o\">.<\/span><span class=\"p\">(<\/span><span class=\"k\">type<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">case<\/span> <span class=\"kt\">int<\/span><span class=\"o\">:<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Twice %v is %v<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"o\">*<\/span><span class=\"m\">2<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">case<\/span> <span class=\"kt\">string<\/span><span class=\"o\">:<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"%q is %v bytes long<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">,<\/span> <span class=\"nb\">len<\/span><span class=\"p\">(<\/span><span class=\"n\">v<\/span><span class=\"p\">))<\/span>\r\n    <span class=\"k\">default<\/span><span class=\"o\">:<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Printf<\/span><span class=\"p\">(<\/span><span class=\"s\">\"I don't know about type %T!<\/span><span class=\"se\">\\n<\/span><span class=\"s\">\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">v<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">do<\/span><span class=\"p\">(<\/span><span class=\"m\">21<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">do<\/span><span class=\"p\">(<\/span><span class=\"s\">\"hello\"<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">do<\/span><span class=\"p\">(<\/span><span class=\"no\">true<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"c\">\/\/ =&gt; Twice 21 is 42<\/span>\r\n    <span class=\"c\">\/\/ =&gt; \"hello\" is 5 bytes long<\/span>\r\n    <span class=\"c\">\/\/ =&gt; I don't know about type bool!<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u53ef\u4ee5\u4e3a\u4e0d\u5177\u6709\u5171\u901a\u70b9\u7684\u591a\u4e2a\u7ed3\u6784\u4f53\u6dfb\u52a0\u65b0\u7c7b\u578b\u3002<\/h2>\n<p>interface \u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3067\u3001Golang\u3067\u30c0\u30c3\u30af\u30bf\u30a4\u30d4\u30f3\u30b0\u3092\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br \/>\n\u30c0\u30c3\u30af\u30bf\u30a4\u30d4\u30f3\u30b0\u306b\u3064\u3044\u3066\u306f\u77e5\u898b\u304c\u591a\u304f\u3042\u308b\u306e\u3067\u3001\u8a73\u3057\u304f\u306f\u66f8\u304d\u307e\u305b\u3093\u304c\u3001interface{} \u3092\u4f7f\u3046\u3053\u3068\u3067\u8907\u6570\u306e\u69cb\u9020\u4f53\u3092\u540c\u3058\uff11\u3064\u306e\u578b\u306b\u5909\u63db\u3057\u307e\u3059\u3002<\/p>\n<p>ads \u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u524d\u306b\u69cb\u9020\u4f53\u304c\u5fc5\u8981\u306a\u95a2\u6570\u3092\u6301\u3063\u3066\u3044\u308b\u306e\u304b\u3092\u30a8\u30c7\u30a3\u30bf\u304c\u6559\u3048\u3066\u304f\u308c\u308b\u305f\u3081\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u3092\u5b9f\u884c\u3059\u308b\u524d\u306e\u95a2\u6570\u306e\u8ffd\u52a0\u6f0f\u308c\u304c\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<\/p>\n<p>interface{}\u304c\u306a\u3044Ruby\u3060\u3068\u3001\u305d\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u5fc5\u8981\u306a\u95a2\u6570\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u306f\u5b9f\u884c\u3057\u306a\u3044\u3068\u308f\u304b\u3089\u306a\u3044\u305f\u3081\u3001\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3067\u5148\u306b\u7d04\u675f\u304c\u6c7a\u3081\u3089\u308c\u308b\u3068\u3001\u5148\u8aad\u307f\u3057\u306a\u304c\u3089\u30b3\u30fc\u30c9\u3092\u304b\u3051\u308b\u306e\u3067\u4fbf\u5229\u3060\u3068\u611f\u3058\u307e\u3057\u305f\u3002<\/p>\n<h3>\u5728\u4e4b\u524d<\/h3>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"fmt\"<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"c\">\/\/ AdVideo ad video response struct<\/span>\r\n    <span class=\"n\">AdVideo<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">VideoURL<\/span> <span class=\"kt\">string<\/span> <span class=\"s\">`json:\"video_url\"`<\/span>\r\n        <span class=\"n\">AdType<\/span>   <span class=\"kt\">int64<\/span>  <span class=\"s\">`json:\"ad_type\"`<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"c\">\/\/ AdPoster ad poster response struct<\/span>\r\n    <span class=\"n\">AdPoster<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">PosterURL<\/span> <span class=\"kt\">string<\/span> <span class=\"s\">`json:\"poster_url\"`<\/span>\r\n        <span class=\"n\">AdType<\/span>    <span class=\"kt\">int64<\/span>  <span class=\"s\">`json:\"ad_type\"`<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">ads<\/span> <span class=\"p\">[]<\/span><span class=\"k\">interface<\/span><span class=\"p\">{}<\/span>\r\n    <span class=\"n\">ads<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">ads<\/span><span class=\"p\">,<\/span> <span class=\"n\">NewAdVideo<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"n\">ads<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">ads<\/span><span class=\"p\">,<\/span> <span class=\"n\">NewAdPoster<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">ads<\/span><span class=\"p\">)<\/span> <span class=\"c\">\/\/ =&gt; [{video url 1} {poster url 3}]<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewAdVideo<\/span><span class=\"p\">()<\/span> <span class=\"n\">AdVideo<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">AdVideo<\/span><span class=\"p\">{<\/span><span class=\"n\">VideoURL<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"video url\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">AdType<\/span><span class=\"o\">:<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">1<\/span><span class=\"p\">)}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewAdPoster<\/span><span class=\"p\">()<\/span> <span class=\"n\">AdPoster<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">AdPoster<\/span><span class=\"p\">{<\/span><span class=\"n\">PosterURL<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"poster url\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">AdType<\/span><span class=\"o\">:<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">3<\/span><span class=\"p\">)}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5b8c\u6210<\/h2>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"fmt\"<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"c\">\/\/ Ad\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9<\/span>\r\n    <span class=\"n\">Ad<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">GetAdType<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int64<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"n\">Ads<\/span> <span class=\"p\">[]<\/span><span class=\"n\">Ad<\/span>\r\n    <span class=\"c\">\/\/ AdVideo ad video response struct<\/span>\r\n    <span class=\"n\">AdVideo<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">VideoURL<\/span> <span class=\"kt\">string<\/span> <span class=\"s\">`json:\"video_url\"`<\/span>\r\n        <span class=\"n\">AdType<\/span>   <span class=\"kt\">int64<\/span>  <span class=\"s\">`json:\"ad_type\"`<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"c\">\/\/ AdPoster ad poster response struct<\/span>\r\n    <span class=\"n\">AdPoster<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">PosterURL<\/span> <span class=\"kt\">string<\/span> <span class=\"s\">`json:\"poster_url\"`<\/span>\r\n        <span class=\"n\">AdType<\/span>    <span class=\"kt\">int64<\/span>  <span class=\"s\">`json:\"ad_type\"`<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">var<\/span> <span class=\"n\">ads<\/span> <span class=\"n\">Ads<\/span>\r\n    <span class=\"n\">ads<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">ads<\/span><span class=\"p\">,<\/span> <span class=\"n\">NewAdVideo<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"n\">ads<\/span> <span class=\"o\">=<\/span> <span class=\"nb\">append<\/span><span class=\"p\">(<\/span><span class=\"n\">ads<\/span><span class=\"p\">,<\/span> <span class=\"n\">NewAdPoster<\/span><span class=\"p\">())<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"n\">_<\/span><span class=\"p\">,<\/span> <span class=\"n\">ad<\/span> <span class=\"o\">:=<\/span> <span class=\"k\">range<\/span> <span class=\"n\">ads<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">ad<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewAdVideo<\/span><span class=\"p\">()<\/span> <span class=\"n\">AdVideo<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">AdVideo<\/span><span class=\"p\">{<\/span><span class=\"n\">VideoURL<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"video url\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">AdType<\/span><span class=\"o\">:<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">1<\/span><span class=\"p\">)}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ =&gt; Ad\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u578b\u3092\u6301\u3064\u305f\u3081\u306b\u3001`GetAdType`\u3092\u5b9f\u88c5\u3057\u305f\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">v<\/span> <span class=\"n\">AdVideo<\/span><span class=\"p\">)<\/span> <span class=\"n\">GetAdType<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int64<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">v<\/span><span class=\"o\">.<\/span><span class=\"n\">AdType<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewAdPoster<\/span><span class=\"p\">()<\/span> <span class=\"n\">AdPoster<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">AdPoster<\/span><span class=\"p\">{<\/span><span class=\"n\">PosterURL<\/span><span class=\"o\">:<\/span> <span class=\"s\">\"poster url\"<\/span><span class=\"p\">,<\/span> <span class=\"n\">AdType<\/span><span class=\"o\">:<\/span> <span class=\"kt\">int64<\/span><span class=\"p\">(<\/span><span class=\"m\">3<\/span><span class=\"p\">)}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ =&gt; Ad\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u578b\u3092\u6301\u3064\u305f\u3081\u306b\u3001`GetAdType`\u3092\u5b9f\u88c5\u3057\u305f\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">p<\/span> <span class=\"n\">AdPoster<\/span><span class=\"p\">)<\/span> <span class=\"n\">GetAdType<\/span><span class=\"p\">()<\/span> <span class=\"kt\">int64<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">p<\/span><span class=\"o\">.<\/span><span class=\"n\">AdType<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u5c06interface{}\u5d4c\u5165\u7ed3\u6784\u4f53\u4e2d<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3053\u3061\u3089\u306einterface{}\u306e\u4f7f\u3044\u65b9\u3082\u8a18\u4e8b\u3092\u66f8\u304f\u969b\u306b\u591a\u304f\u306e\u77e5\u898b\u304c\u3042\u308b\u3068\u77e5\u3063\u305f\u306e\u3067\u7279\u306b\u3053\u3053\u3067\u306f\u7d30\u304b\u304f\u66f8\u304f\u3053\u3068\u306f\u3057\u307e\u305b\u3093\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">PHP\u3084Java\u3067\u306f\u3001implements \u3092\u4f7f\u3063\u3066interface \u3092\u53d6\u308a\u8fbc\u307f\u307e\u3059\u304c\u3001Golang\u3067\u306f\u30d5\u30a3\u30fc\u30eb\u30c9\u304cinterface{}\u306e\u578b\u3092\u6301\u3064\u3088\u3046\u306b\u3057\u3066\u3001interface{}\u3092\u53d6\u308a\u7d44\u3080\u3068\u3044\u3046\u8a00\u8a9e\u4ed5\u69d8\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3053\u306e\u8a00\u8a9e\u4ed5\u69d8\u3092\u7406\u89e3\u3057\u305f\u3068\u304d\u306b\u4fbf\u5229\u3060\u306a\u3068\u611f\u3058\u307e\u3057\u305f\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u4f8b\u3048\u3070\u3001\u65b0\u3057\u3044API\u5b9f\u88c5\u3067\u65b0\u305f\u306b\u69cb\u9020\u4f53\u3092\u4f5c\u6210\u3059\u308b\u3068\u304d\u306b\u3001\u5fc5\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3060\u3051\u63c3\u3063\u3066\u3044\u305f\u3089\u6b63\u5e38\u306b\u52d5\u304f\u305f\u3081\u3001\u3068\u308a\u3042\u3048\u305ainterface{}\u3067\u5ba3\u8a00\u3055\u308c\u305f\u95a2\u6570\u3092\u65b0\u3057\u3044\u69cb\u9020\u4f53\u306b\u5b9f\u88c5\u3059\u308c\u3070\u3044\u3044\u3060\u3051\u3068\u611f\u3058\u307e\u3057\u305f\u3002<br \/>\n\u4e0a\u306e4\u3068\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u3084\u308b\u3053\u3068\u30ea\u30b9\u30c8\u304c\u6700\u521d\u304b\u3089\u6c7a\u307e\u3063\u3066\u3044\u3066\u3001\u30ea\u30b9\u30c8\u306b\u3042\u308b\u95a2\u6570\u3092\u5b9a\u7fa9\u3059\u308b\u3053\u3068\u3067\u3084\u308b\u3053\u3068\u304c\u5b8c\u4e86\u3057\u3066\u3044\u304f\u611f\u899a\u306b\u306a\u3063\u305f\u306e\u3067\u3001\u308f\u304b\u308a\u3084\u3059\u3044\u306a\u3068\u611f\u3058\u307e\u3057\u305f\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"s\">\"fmt\"<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"c\">\/\/ TagClient tag client\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9<\/span>\r\n    <span class=\"n\">TagClient<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">GetTag<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"c\">\/\/ TagClientImpl TagClient\u306e\u5b9f\u969b\u306e\u51e6\u7406<\/span>\r\n    <span class=\"n\">TagClientImpl<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"c\">\/\/ TagClientImplV2 TagClient\u306e\u5b9f\u969b\u306e\u51e6\u7406<\/span>\r\n    <span class=\"n\">TagClientImplV2<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"c\">\/\/ ArticleClientImpl Tag\u3068\u3044\u3046\u540d\u524d\u3067\u3001TagClient\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u6301\u3064\u3002<\/span>\r\n    <span class=\"n\">ArticleClientImpl<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">Tag<\/span> <span class=\"n\">TagClient<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">articleClientImpl<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">NewArticleClientImpl<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"c\">\/\/ \u8a18\u4e8b\u306e\u30bf\u30b0\u3092\u53d6\u5f97\u3059\u308b\u306b\u306f\u3001`Tag`\u306e\u30a4\u30f3\u30bf\u30d5\u30a7\u30fc\u30b9\u3092\u7d4c\u7531\u3057\u3066\u3001`GetTag`\u3092\u547c\u3073\u51fa\u3059\u3002<\/span>\r\n    <span class=\"n\">articleClientImpl<\/span><span class=\"o\">.<\/span><span class=\"n\">Tag<\/span><span class=\"o\">.<\/span><span class=\"n\">GetTag<\/span><span class=\"p\">()<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewArticleClientImpl<\/span><span class=\"p\">()<\/span> <span class=\"o\">*<\/span><span class=\"n\">ArticleClientImpl<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ Tag\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u6e21\u3059\u3082\u306e\u3092NewTag()\u304b\u3089NewTagV2()\u306b\u5909\u66f4\u3059\u308b\u3060\u3051\u3002\u7c21\u5358...\uff01!<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">ArticleClientImpl<\/span><span class=\"p\">{<\/span><span class=\"n\">Tag<\/span><span class=\"o\">:<\/span> <span class=\"n\">NewTagV2<\/span><span class=\"p\">()}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewTag<\/span><span class=\"p\">()<\/span> <span class=\"n\">TagClient<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">TagClientImpl<\/span><span class=\"p\">{}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">c<\/span> <span class=\"o\">*<\/span><span class=\"n\">TagClientImpl<\/span><span class=\"p\">)<\/span> <span class=\"n\">GetTag<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Here is article tag\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewTagV2<\/span><span class=\"p\">()<\/span> <span class=\"n\">TagClient<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">TagClientImplV2<\/span><span class=\"p\">{}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">c<\/span> <span class=\"o\">*<\/span><span class=\"n\">TagClientImplV2<\/span><span class=\"p\">)<\/span> <span class=\"n\">GetTag<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"s\">\"Here is article tag V2\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u8d60\u54c1 &#8211; \u81ea\u5b9a\u4e49\u9519\u8bef\u7684\u5236\u4f5c\u65b9\u6cd5<\/h2>\n<ul class=\"post-ul\">golang\u306eerror\u3063\u3066\u3069\u3093\u306a\u4e2d\u8eab\u306a\u306e\u304b\u3092\u8abf\u3079\u3088\u3046\u3068\u601d\u3044\u3001\u30c9\u30ad\u30e5\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u8aad\u3093\u3060\u3068\u3053\u308d\u3001\u306a\u3093\u3068interface{}\u3067\u3057\u305f\u3002<\/ul>\n<pre class=\"post-pre\"><code><span class=\"k\">type<\/span> <span class=\"kt\">error<\/span> <span class=\"k\">interface<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">Error<\/span><span class=\"p\">()<\/span> <span class=\"kt\">string<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u3068\u3044\u3046\u3053\u3068\u306f\u3001\u69cb\u9020\u4f53\u306bError() string\u95a2\u6570\u3092\u6301\u305f\u305b\u308c\u3070\u3001\u305d\u306e\u69cb\u9020\u4f53\u3092error\u578b\u3068\u3057\u3066\u6271\u3063\u3066\u304f\u308c\u308b\u306e\u304b&#8230;\uff1f<\/ul>\n<\/li>\n<\/ul>\n<p>\u5b9f\u9a13\u3067\u66f8\u3044\u3066\u307f\u305f\u3089\u3001\u306a\u3093\u3068\u81ea\u524d\u3067\u7528\u610f\u3057\u305f\u69cb\u9020\u4f53\u304c\u898b\u4e8berror\u578b\u3068\u306a\u308a\u307e\u3057\u305f&#8230;!<\/p>\n<p>Error() string\u3055\u3048\u3042\u308c\u3070\u3001error\u578b\u306b\u306a\u308b\u306e\u3067\u3001\u3044\u308d\u3044\u308d\u306a\u5834\u9762\u306e\u30a8\u30e9\u30fc\u69cb\u9020\u4f53\u304c\u4f5c\u6210\u3067\u304d\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">package<\/span> <span class=\"n\">main<\/span>\r\n\r\n<span class=\"k\">import<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"s\">\"fmt\"<\/span>\r\n    <span class=\"s\">\"time\"<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">type<\/span> <span class=\"p\">(<\/span>\r\n    <span class=\"n\">Article<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">postedAt<\/span> <span class=\"n\">time<\/span><span class=\"o\">.<\/span><span class=\"n\">Time<\/span>\r\n    <span class=\"p\">}<\/span>\r\n    <span class=\"c\">\/\/ \u30ab\u30b9\u30bf\u30e0\u30a8\u30e9\u30fc\u69cb\u9020\u4f53<\/span>\r\n    <span class=\"n\">ArticleNotFoundError<\/span> <span class=\"k\">struct<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">Message<\/span> <span class=\"kt\">string<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">)<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">main<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">article<\/span><span class=\"p\">,<\/span> <span class=\"n\">err<\/span> <span class=\"o\">:=<\/span> <span class=\"n\">GetArticle<\/span><span class=\"p\">()<\/span>\r\n    <span class=\"k\">if<\/span> <span class=\"n\">err<\/span> <span class=\"o\">!=<\/span> <span class=\"no\">nil<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">fmt<\/span><span class=\"o\">.<\/span><span class=\"n\">Println<\/span><span class=\"p\">(<\/span><span class=\"n\">err<\/span><span class=\"o\">.<\/span><span class=\"n\">Error<\/span><span class=\"p\">())<\/span> <span class=\"c\">\/\/ =&gt; \"article not found\"<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">GetArticle<\/span><span class=\"p\">()<\/span> <span class=\"p\">(<\/span><span class=\"o\">*<\/span><span class=\"n\">Article<\/span><span class=\"p\">,<\/span> <span class=\"kt\">error<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"no\">nil<\/span><span class=\"p\">,<\/span> <span class=\"n\">NewArticleNotFoundError<\/span><span class=\"p\">(<\/span><span class=\"s\">\"article not found\"<\/span><span class=\"p\">)<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">func<\/span> <span class=\"n\">NewArticleNotFoundError<\/span><span class=\"p\">(<\/span><span class=\"n\">message<\/span> <span class=\"kt\">string<\/span><span class=\"p\">)<\/span> <span class=\"o\">*<\/span><span class=\"n\">ArticleNotFoundError<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"o\">&amp;<\/span><span class=\"n\">ArticleNotFoundError<\/span><span class=\"p\">{<\/span><span class=\"n\">Message<\/span><span class=\"o\">:<\/span> <span class=\"n\">message<\/span><span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/ \u3053\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308b\u304a\u304b\u3052\u3067\u3001ArticleNotFoundError\u69cb\u9020\u4f53\u306e\u578b\u306ferror\u306b\u306a\u308a\u3001GetArticle\u306e\u7b2c2\u5f15\u6570\u306e\u578b\u306ferror\u306b\u306a\u308a\u307e\u3057\u305f\u3002<\/span>\r\n<span class=\"k\">func<\/span> <span class=\"p\">(<\/span><span class=\"n\">e<\/span> <span class=\"o\">*<\/span><span class=\"n\">ArticleNotFoundError<\/span><span class=\"p\">)<\/span> <span class=\"n\">Error<\/span><span class=\"p\">()<\/span> <span class=\"kt\">string<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">return<\/span> <span class=\"n\">e<\/span><span class=\"o\">.<\/span><span class=\"n\">Message<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<h2>\u603b\u7ed3<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">\u9577\u304f\u306a\u308a\u307e\u3057\u305f\u304c\u3001\u3053\u306e\u8a18\u4e8b\u3092\u77ed\u304f\u307e\u3068\u3081\u308b\u3068\u3001golang\u3067\u306e interface{} \u306f\u578b\u3067\u3042\u308b \u306b\u306a\u308a\u307e\u3059\u3002<\/ul>\n<\/li>\n<\/ul>\n<p>\u8ee2\u8077\u3059\u308b\u524d\u306bgolang\u306einterface{}\u306e\u3053\u3068\u3092\u52c9\u5f37\u3057\u3066\u304a\u304d\u307e\u3057\u305f\u304c\u3001\u5b9f\u969b\u306b\u696d\u52d9\u306b\u5165\u3063\u3066\u66f8\u3044\u3066\u307f\u308b\u3068\u7406\u89e3\u3067\u304d\u3066\u3044\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u3082\u3042\u308a\u3001\u591a\u304f\u6226\u308f\u306a\u3044\u3068\u3044\u3051\u306a\u304f\u306a\u308a\u307e\u3057\u305f\u3002<br \/>\n(PHP\u3084Java\u306b\u306f\u8efd\u304f\u89e6\u308c\u3066\u3044\u3066\u3001\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3068\u3044\u3046\u6982\u5ff5\u3092\u5168\u304f\u77e5\u3089\u306a\u3044\u308f\u3051\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u304c\u3001\u3044\u307e\u3044\u3061\u300c\u3053\u308c\u3092\u4f7f\u3046\u5fc5\u8981\u306f\u3042\u308b\u306e\u304b&#8230;?\u300d\u3068\u8151\u306b\u843d\u3061\u3066\u3044\u306a\u3044\u3053\u3068\u304c\u591a\u304b\u3063\u305f\u3067\u3059&#8230;\u3002)<\/p>\n<p>\u696d\u52d9\u3067\u89e6\u3063\u3066\u3044\u308b\u307f\u308b\u3068\u3001\u4fbf\u5229\u306a\u3082\u306e\u3060\u3068\u611f\u3058\u305f\u306e\u3067\u3001\u6226\u3063\u3066\u751f\u304d\u5ef6\u3073\u305f\u304b\u3044\u304c\u3042\u3063\u305f\u3068\u601d\u3044\u307e\u3057\u305f\u3002\u3053\u308c\u304b\u3089\u3082\u9069\u6750\u9069\u6240\u3067\u4f7f\u3063\u3066\u3044\u304d\u305f\u3044\u3068\u601d\u3044\u307e\u3059\u3002<br \/>\nGW\u3067\u6642\u9593\u304c\u3067\u304d\u305f\u305f\u3081\u5b66\u3093\u3060\u3053\u3068\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u304c\u3001\u4eca\u5f8c\u65b0\u305f\u306b\u5b66\u3076\u3053\u3068\u304c\u3042\u3063\u305f\u3089\u3001\u8ffd\u8a18\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u800c\u8a00\u4e4b \u53bb\u5e74\u306e8\u6708\u306b\u793e\u4f1a\u4eba\u30a8\u30f3\u30b8\u30cb\u30a2\u306b\u306a\u308a\u3001\u4eca\u5e74\u306e2\u6708\u307e\u3067API\u30b5\u30fc\u30d0\u30fc\u306e\u958b\u767a\u3092Ruby on Rails\u3067 [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-44151","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast 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