{"id":8514,"date":"2025-10-07T15:18:01","date_gmt":"2025-10-07T15:18:01","guid":{"rendered":"https:\/\/pokecon.jp\/job\/?p=8514"},"modified":"2025-10-07T15:18:01","modified_gmt":"2025-10-07T15:18:01","slug":"gopher%e3%83%87%e3%83%93%e3%83%a5%e3%83%bc%e3%81%99%e3%82%8b%e3%81%ae%e3%81%a7a-tour-of-go%e3%82%92%e4%b8%80%e9%80%9a%e3%82%8a%e3%82%84%e3%81%a3%e3%81%9f-%e7%a9%ba%e3%81%ae%e7%ae%b1","status":"publish","type":"post","link":"https:\/\/pokecon.jp\/job\/8514\/","title":{"rendered":"Gopher\u30c7\u30d3\u30e5\u30fc\u3059\u308b\u306e\u3067A Tour of Go\u3092\u4e00\u901a\u308a\u3084\u3063\u305f &#8211; \u7a7a\u306e\u7bb1"},"content":{"rendered":"\n<\/p>\n<div>\n<p>\u8ee2\u8077\u5148\u3067Go\u3092\u3084\u308b\u3063\u3066\u805e\u3044\u3066\u305f\u306e\u3067\u6709\u7d66\u6d88\u5316\u4e2d\u306b\u300e\u521d\u3081\u3066\u306eGo\u8a00\u8a9e\u300f\u3092\u8aad\u3093\u3067\u3044\u305f\u3002<\/p>\n<div class=\"hatena-asin-detail\"><a target=\"_blank\" href=\"https:\/\/www.amazon.co.jp\/dp\/4814401191?tag=note0d2e-22&amp;linkCode=osi&amp;th=1&amp;psc=1\" class=\"hatena-asin-detail-image-link\" target=\"_blank\" rel=\"sponsored noopener\"><img decoding=\"async\" src=\"https:\/\/m.media-amazon.com\/images\/I\/41X10+elsuL._SL500_.jpg\" class=\"hatena-asin-detail-image\" alt=\"\u521d\u3081\u3066\u306eGo\u8a00\u8a9e \u7b2c2\u7248 \u2015\u4ed6\u8a00\u8a9e\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u305f\u3081\u306e\u30a4\u30c7\u30a3\u30aa\u30de\u30c6\u30a3\u30c3\u30afGo\u5b9f\u8df5\u30ac\u30a4\u30c9\" title=\"\u521d\u3081\u3066\u306eGo\u8a00\u8a9e \u7b2c2\u7248 \u2015\u4ed6\u8a00\u8a9e\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u305f\u3081\u306e\u30a4\u30c7\u30a3\u30aa\u30de\u30c6\u30a3\u30c3\u30afGo\u5b9f\u8df5\u30ac\u30a4\u30c9\"\/><\/a><\/div>\n<p>\u3051\u3069\u305d\u308c\u3088\u308a\u3082\u5148\u306bA Tour of Go\u3092\u3084\u3063\u3068\u304f\u306e\u304c\u6b63\u89e3\u3060\u3063\u305f<a target=\"_blank\" href=\"#f-40680151\" id=\"fn-40680151\" name=\"fn-40680151\" title=\"\u5168\u304f\u624b\u304c\u52d5\u304b\u3093 &amp; \u8a18\u61b6\u306b\u5b9a\u7740\u3057\u3066\u306a\u304b\u3063\u305f\u3002\">*1<\/a>\u3002\u66f8\u7c4d\u81ea\u4f53\u306fGo\u8a00\u8a9e\u306e\u4ed5\u69d8\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u66f8\u304b\u308c\u3066\u3044\u3066\u3081\u3063\u3061\u3083\u3044\u3044\u672c\u306a\u3093\u3060\u3051\u3069\u3001100%\u50d5\u306e\u982d\u3068\u66f8\u7c4d\u306e\u4f7f\u3044\u65b9\u304c\u60aa\u304b\u3063\u305f\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo-tour-jp.appspot.com%2Flist\" title=\"A Tour of Go\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go-tour-jp.appspot.com\/list\">go-tour-jp.appspot.com<\/a><\/cite><\/p>\n<p>\u300cGo\u306e\u57fa\u672c\u5b8c\u5168\u306b\u7406\u89e3\u3057\u305f\u300d\u72b6\u614b\u3067\u300e\u521d\u3081\u3066\u306eGo\u8a00\u8a9e\u300f\u306f\u3082\u3046\u4e00\u56de\u8aad\u3080\u3053\u3068\u306b\u3059\u308b\u3002\u305d\u308c\u306f\u305d\u308c\u3067\u3088\u308a\u7406\u89e3\u304c\u6df1\u307e\u308a\u305d\u3046\u3002<\/p>\n<p><span itemscope=\"\" itemtype=\"http:\/\/schema.org\/Photograph\"><img decoding=\"async\" src=\"https:\/\/cdn-ak.f.st-hatena.com\/images\/fotolife\/i\/inorinrinrin\/20251007\/20251007222458.png\" width=\"1200\" height=\"649\" loading=\"lazy\" title=\"\" class=\"hatena-fotolife\" itemprop=\"image\"\/><\/span><\/p>\n<p>\u5de6\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%C1%A5%E5%A1%BC%A5%C8%A5%EA%A5%A2%A5%EB\">\u30c1\u30e5\u30fc\u30c8\u30ea\u30a2\u30eb<\/a>\u3001\u53f3\u306b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u30a8\u30c7\u30a3\u30bf\u304c\u3042\u308bUI\u306b\u306a\u3063\u3066\u3044\u308b\u3002\u30c8\u30d4\u30c3\u30af\u30b9\u3054\u3068\u306b\u30d9\u30fc\u30b9\u306e\u30b3\u30fc\u30c9\u3092\u7528\u610f\u3057\u3066\u304f\u308c\u3066\u3044\u3066\u3001\u30ac\u30c1\u30e3\u30ac\u30c1\u30e3\u624b\u5143\u3067\u66f8\u304d\u63db\u3048\u3066\u3001\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u3057\u3066\u3001\u5b9f\u884c\u3057\u3066\u7d50\u679c\u3092\u898b\u308b\u3063\u3066\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u9014\u4e2d\u7df4\u7fd2\u554f\u984c\u3082\u631f\u3093\u3067\u304f\u308c\u305f\u308a\u3059\u308b\u3002<\/p>\n<p>A Tour of Go\u306b\u9650\u3089\u305a\u3001\u50d5\u81ea\u8eab\u304c\u7591\u554f\u306b\u601d\u3063\u3066\u8abf\u3079\u3066\u305f\u3053\u3068\u3068\u304b\u8a66\u3057\u3066\u305f\u3053\u3068\u3082\u542b\u307e\u308c\u308b\u3002<\/p>\n<h2 id=\"Naked-Return-\u306f\u4f7f\u3046\u306a\">Naked Return \u306f\u4f7f\u3046\u306a<\/h2>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fboldlygo.tech%2Farchive%2F2024-08-02-naked-returns%2F\" title=\"Naked returns\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/boldlygo.tech\/archive\/2024-08-02-naked-returns\/\">boldlygo.tech<\/a><\/cite><\/p>\n<p>\u4e00\u898b\u4fbf\u5229\u3084\u30fc\u3093\u3068\u601d\u3046\u3051\u3069\u3001\u9577\u304f\u306a\u3063\u3066\u6700\u5f8c\u306b<code>return<\/code>\u3060\u3051\u3055\u308c\u308b\u3068\u623b\u308a\u5024\u304c\u591a\u304b\u3063\u305f\u308a\u3059\u308b\u3068\u5e38\u306b\u8133\u5185\u30e1\u30e2\u30ea\u306e\u4fdd\u6301\u3057\u3066\u308b\u5024\u3092\u8a18\u61b6\u3057\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u304b\u3089\u8f9b\u3044\u306e\u304b\u3002<\/p>\n<h2 id=\"Go\u306eswitch\">Go\u306e<code>switch<\/code><\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"runtime\"<\/span>\n)\n\n<span class=\"synStatement\">func<\/span> main() {\n    fmt.Print(<span class=\"synConstant\">\"Go runs on \"<\/span>)\n    <span class=\"synStatement\">switch<\/span> os := runtime.GOOS; os {\n    <span class=\"synStatement\">case<\/span> <span class=\"synConstant\">\"darwin\"<\/span>:\n        fmt.Println(<span class=\"synConstant\">\"OS X.\"<\/span>)\n    <span class=\"synStatement\">case<\/span> <span class=\"synConstant\">\"linux\"<\/span>:\n        fmt.Println(<span class=\"synConstant\">\"Linux.\"<\/span>)\n    <span class=\"synStatement\">default<\/span>:\n        \n        \n        fmt.Printf(<span class=\"synConstant\">\"%s.<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, os)\n    }\n}\n<\/pre>\n<p><code>go fmt<\/code>\u3067\u30b3\u30fc\u30c9\u6574\u5f62\u3057\u3066\u3082\u3053\u308c\u3002Kotlin\u3068\u304b\u306e\u4e16\u754c\u304b\u3089\u304f\u308b\u3068\u82e5\u5e72\u9055\u548c\u611f\u3042\u3063\u3066\u3001<code>case<\/code>\u306e\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u4e0b\u304c\u3063\u3066\u6b32\u3057\u3044\u6c17\u304c\u3057\u306a\u304f\u3082\u306a\u3044\u3002<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/Java\">Java<\/a>\u3068\u304b\u306b\u3042\u308b\u30d5\u30a9\u30fc\u30eb\u30b9\u30eb\u30fc\u304c\u306a\u3044\u306e\u306f\u3081\u3063\u3061\u3083\u5feb\u9069\u3002<\/p>\n<h2 id=\"Defer-Panic-and-Recover\">Defer, Panic, and Recover<\/h2>\n<ol>\n<li><code>defer<\/code>\u306b\u6e21\u3055\u308c\u305f\u95a2\u6570\u306e\u5f15\u6570\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%B9%A5%C6%A1%BC%A5%C8%A5%E1%A5%F3%A5%C8\">\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8<\/a>\u304c\u8a55\u4fa1\u3055\u308c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u306e\u3082\u306e\u306b\u6c7a\u307e\u308b<\/li>\n<li><code>Defer<\/code>\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/LIFO\">LIFO<\/a>\u3067\u5b9f\u884c\u3055\u308c\u308b<\/li>\n<li>\u623b\u308a\u95a2\u6570\u306e\u540d\u524d\u4ed8\u304d\u623b\u308a\u5024\u3092\u8aad\u307f\u53d6\u308a\u3001\u5272\u308a\u5f53\u3066\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/li>\n<\/ol>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo.dev%2Fblog%2Fdefer-panic-and-recover\" title=\"Defer, Panic, and Recover - The Go Programming Language\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go.dev\/blog\/defer-panic-and-recover\">go.dev<\/a><\/cite><\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    f()\n    fmt.Println(<span class=\"synConstant\">\"Returned normally from f.\"<\/span>)\n}\n\n<span class=\"synStatement\">func<\/span> f() {\n    <span class=\"synStatement\">defer<\/span> <span class=\"synType\">func<\/span>() {\n        <span class=\"synStatement\">if<\/span> r := <span class=\"synStatement\">recover<\/span>(); r != <span class=\"synStatement\">nil<\/span> {\n            fmt.Println(<span class=\"synConstant\">\"Recovered in f\"<\/span>, r)\n        }\n    }()\n    fmt.Println(<span class=\"synConstant\">\"Calling g.\"<\/span>)\n    g(<span class=\"synConstant\">0<\/span>)\n    fmt.Println(<span class=\"synConstant\">\"Returned normally from g.\"<\/span>)\n}\n\n<span class=\"synStatement\">func<\/span> g(i <span class=\"synType\">int<\/span>) {\n    <span class=\"synStatement\">if<\/span> i &gt; <span class=\"synConstant\">3<\/span> {\n        fmt.Println(<span class=\"synConstant\">\"Panicking!\"<\/span>)\n        <span class=\"synStatement\">panic<\/span>(fmt.Sprintf(<span class=\"synConstant\">\"%v\"<\/span>, i))\n    }\n    <span class=\"synStatement\">defer<\/span> fmt.Println(<span class=\"synConstant\">\"Defer in g\"<\/span>, i)\n    fmt.Println(<span class=\"synConstant\">\"Printing in g\"<\/span>, i)\n    g(i + <span class=\"synConstant\">1<\/span>)\n}\n<\/pre>\n<p>\u3053\u306e\u3068\u304d\u306e\u51fa\u529b\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">Calling g.\nPrinting in g 0\nPrinting in g 1\nPrinting in g 2\nPrinting in g 3\nPanicking!\nDefer in g 3\nDefer in g 2\nDefer in g 1\nDefer in g 0\nRecovered in f 4\nReturned normally from f.<\/pre>\n<h2 id=\"Go\u306b\u304a\u3051\u308b\u30dd\u30a4\u30f3\u30bf\">Go\u306b\u304a\u3051\u308b\u30dd\u30a4\u30f3\u30bf<\/h2>\n<p>Go\u306b\u304a\u3051\u308b <code>*\uff08\u30dd\u30a4\u30f3\u30bf\uff09<\/code>\u306f\u3001\u300c<strong>\u3053\u306e\u95a2\u6570\u306f\u547c\u3073\u51fa\u3057\u5143\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u3064\u3082\u308a\u304c\u3042\u308b<\/strong>\u300d\u3068\u3044\u3046\u610f\u56f3\u3092\u660e\u793a\u7684\u306b\u8868\u73fe\u3059\u308b\u4ed5\u7d44\u307f \u3068\u7406\u89e3\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> User <span class=\"synStatement\">struct<\/span> {\n    Name <span class=\"synType\">string<\/span>\n}\n\n\n<span class=\"synStatement\">func<\/span> renameValue(u User) {\n    u.Name = <span class=\"synConstant\">\"Bob\"<\/span>\n}\n\n\n<span class=\"synStatement\">func<\/span> renamePointer(u *User) {\n    u.Name = <span class=\"synConstant\">\"Bob\"<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    u := User{Name: <span class=\"synConstant\">\"Alice\"<\/span>}\n\n    renameValue(u)\n    fmt.Println(u.Name) \n\n    renamePointer(&amp;u)\n    fmt.Println(u.Name) \n}\n<\/pre>\n<h2 id=\"Gos-Declaration-Syntax\">Go&#8217;s Declaration Syntax<\/h2>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgo.dev%2Fblog%2Fdeclaration-syntax\" title=\"Go's Declaration Syntax - The Go Programming Language\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/go.dev\/blog\/declaration-syntax\">go.dev<\/a><\/cite><\/p>\n<p>\u8003\u3048\u305f\u3053\u3068\u3082\u306a\u304b\u3063\u305f\u3002\u78ba\u304b\u306b\u81ea\u5206\u304c\u8aad\u307f\u3084\u3059\u3044\u3068\u611f\u3058\u308bKotlin\u3082TypeScript\u3082\u53f3\u306b\u578b\u3092\u66f8\u3044\u3066\u308b\u306a\u3068\u306a\u3063\u305f\u3002<\/p>\n<h2 id=\"Pointers-to-structs\">Pointers to structs<\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">type<\/span> Vertex <span class=\"synStatement\">struct<\/span> {\n    X <span class=\"synType\">int<\/span>\n    Y <span class=\"synType\">int<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    v := Vertex{<span class=\"synConstant\">1<\/span>, <span class=\"synConstant\">2<\/span>}\n    p := &amp;v\n    fmt.Println(v)\n    p.X = <span class=\"synConstant\">1e9<\/span>\n    fmt.Println(v)\n}\n<\/pre>\n<ul>\n<li><code>&amp;<\/code>\u3092\u4ed8\u3051\u308b\u3053\u3068\u3067<code>p<\/code>\u306f<code>v<\/code>\u306e\u53c2\u7167\u3092\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u308b<\/li>\n<li>\u305d\u3046\u3057\u305f\u3068\u304d\u306b<code>(*p).X<\/code>\u3068\u304b\u66f8\u304f\u306e\u306f\u30a2\u30db\u3089\u3057\u3044\u306e\u3067Go\u3067\u306f\u666e\u901a\u306b<code>p.X<\/code>\u3068\u304b\u3051\u308b\u3088<\/li>\n<\/ul>\n<p>\u3068\u3044\u3046\u3053\u3068\u304c\u78ba\u8a8d\u3067\u304d\u308b\u3002\u4ee5\u4e0b\u51fa\u529b\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">{1 2}\n{1000000000 2}<\/pre>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">var<\/span> primes []<span class=\"synType\">int<\/span> = [<span class=\"synConstant\">6<\/span>]<span class=\"synType\">int<\/span>{<span class=\"synConstant\">2<\/span>, <span class=\"synConstant\">3<\/span>, <span class=\"synConstant\">5<\/span>, <span class=\"synConstant\">7<\/span>, <span class=\"synConstant\">11<\/span>, <span class=\"synConstant\">13<\/span>} \n\n    <span class=\"synStatement\">var<\/span> s []<span class=\"synType\">int<\/span> = primes[<span class=\"synConstant\">1<\/span>:<span class=\"synConstant\">4<\/span>]\n    fmt.Println(s)\n}\n<\/pre>\n<p><strong>\u30b9\u30e9\u30a4\u30b9\u306f\u914d\u5217\u3078\u306e\u53c2\u7167\u306a\u306e\u3067\u3001\u30b9\u30e9\u30a4\u30b9\u306e\u8981\u7d20\u3092\u66f8\u304d\u63db\u3048\u308b\u3068\u5143\u306e\u914d\u5217\u306e\u8981\u7d20\u3082\u66f8\u304d\u5909\u308f\u308b<\/strong><\/p>\n<h2 id=\"make-append---Slice\u306ecap\u3092\u8d85\u3048\u305f\u6642\">make, append &#8211; Slice\u306ecap\u3092\u8d85\u3048\u305f\u6642<\/h2>\n<p><code>make<\/code>\u306f\u7121\u304b\u3089Slice\u3092\u4f5c\u308b\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    a := <span class=\"synStatement\">make<\/span>([]<span class=\"synType\">int<\/span>, <span class=\"synConstant\">5<\/span>)\n    printSlice(<span class=\"synConstant\">\"a\"<\/span>, a)\n\n    b := <span class=\"synStatement\">make<\/span>([]<span class=\"synType\">int<\/span>, <span class=\"synConstant\">0<\/span>, <span class=\"synConstant\">5<\/span>)\n    printSlice(<span class=\"synConstant\">\"b\"<\/span>, b)\n\n    c := b[:<span class=\"synConstant\">2<\/span>]\n    printSlice(<span class=\"synConstant\">\"c\"<\/span>, c)\n\n    d := c[<span class=\"synConstant\">2<\/span>:<span class=\"synConstant\">5<\/span>]\n    printSlice(<span class=\"synConstant\">\"d\"<\/span>, d)\n<span class=\"synError\"> <\/span>\n    d = <span class=\"synStatement\">append<\/span>(d, <span class=\"synConstant\">1<\/span>)\n    printSlice(<span class=\"synConstant\">\"d\"<\/span>, d)\n}\n\n<span class=\"synStatement\">func<\/span> printSlice(s <span class=\"synType\">string<\/span>, x []<span class=\"synType\">int<\/span>) {\n    fmt.Printf(<span class=\"synConstant\">\"%s len=%d cap=%d %v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>,\n        s, <span class=\"synStatement\">len<\/span>(x), <span class=\"synStatement\">cap<\/span>(x), x)\n}\n<\/pre>\n<ul>\n<li><code>cap  \u306e\u5834\u5408 \u2192 \u500d\u306b\u3059\u308b<\/code><\/li>\n<li><code>cap &gt;= 1024<\/code> \u306e\u5834\u5408 \u2192 \u7d04 1.25\u500d\u305a\u3064\u5897\u3084\u3059<\/li>\n<li>\u3064\u307e\u308a<code>append<\/code>\u306f<strong>\u300c\u65b0\u3057\u3044\u914d\u5217\u306b\u30b3\u30d4\u30fc\u3057\u3066cap\u3092\u5897\u3084\u3059\u300d<\/strong>\u3068\u3044\u3046\u52d5\u4f5c\u3082\u3057\u3066\u3044\u308b<\/li>\n<\/ul>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">a len=5 cap=5 [0 0 0 0 0]\nb len=0 cap=5 []\nc len=2 cap=5 [0 0]\nd len=3 cap=3 [0 0 0]\nd len=4 cap=6 [0 0 0 1]<\/pre>\n<h2 id=\"range---\u30c7\u30fc\u30bf\u69cb\u9020\u3092iterate\u3059\u308b\">range &#8211; \u30c7\u30fc\u30bf\u69cb\u9020\u3092<code>iterate<\/code>\u3059\u308b<\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">var<\/span> pow = []<span class=\"synType\">int<\/span>{<span class=\"synConstant\">1<\/span>, <span class=\"synConstant\">2<\/span>, <span class=\"synConstant\">4<\/span>, <span class=\"synConstant\">8<\/span>, <span class=\"synConstant\">16<\/span>, <span class=\"synConstant\">32<\/span>, <span class=\"synConstant\">64<\/span>, <span class=\"synConstant\">128<\/span>}\n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">for<\/span> i, v := <span class=\"synStatement\">range<\/span> pow {\n        fmt.Printf(<span class=\"synConstant\">\"2**%d = %d<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, i, v)\n    }\n}\n<\/pre>\n<h2 id=\"map\u306e\u64cd\u4f5c\">map\u306e\u64cd\u4f5c<\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    m := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">map<\/span>[<span class=\"synType\">string<\/span>]<span class=\"synType\">int<\/span>)\n\n    m[<span class=\"synConstant\">\"Answer\"<\/span>] = <span class=\"synConstant\">42<\/span>\n    fmt.Println(<span class=\"synConstant\">\"The value:\"<\/span>, m[<span class=\"synConstant\">\"Answer\"<\/span>])\n\n    m[<span class=\"synConstant\">\"Answer\"<\/span>] = <span class=\"synConstant\">48<\/span>\n    fmt.Println(<span class=\"synConstant\">\"The value:\"<\/span>, m[<span class=\"synConstant\">\"Answer\"<\/span>])\n\n    <span class=\"synStatement\">delete<\/span>(m, <span class=\"synConstant\">\"Answer\"<\/span>)\n    fmt.Println(<span class=\"synConstant\">\"The value:\"<\/span>, m[<span class=\"synConstant\">\"Answer\"<\/span>])\n\n    v, ok := m[<span class=\"synConstant\">\"Answer\"<\/span>]\n    fmt.Println(<span class=\"synConstant\">\"The value:\"<\/span>, v, <span class=\"synConstant\">\"Present?\"<\/span>, ok)\n}\n<\/pre>\n<h2 id=\"go\u306b\u30af\u30e9\u30b9\u306f\u306a\u3044method\u3092\u4f5c\u308b\u306b\u306fstruct\u30ec\u30b7\u30fc\u30d0\u30fc\u5f15\u6570\u3092\u4f5c\u308b\">go\u306b\u30af\u30e9\u30b9\u306f\u306a\u3044\/method\u3092\u4f5c\u308b\u306b\u306f<code>struct<\/code>+\u30ec\u30b7\u30fc\u30d0\u30fc\u5f15\u6570\u3092\u4f5c\u308b<\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"math\"<\/span>\n)\n\n<span class=\"synStatement\">type<\/span> Vertex <span class=\"synStatement\">struct<\/span> {\n    X, Y <span class=\"synType\">float64<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> (v Vertex) Abs() <span class=\"synType\">float64<\/span> {\n    <span class=\"synStatement\">return<\/span> math.Sqrt(v.X*v.X + v.Y*v.Y)\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    v := Vertex{<span class=\"synConstant\">3<\/span>, <span class=\"synConstant\">4<\/span>}\n    fmt.Println(v.Abs())\n}\n<\/pre>\n<h2 id=\"Go\u306eMethods-continued-vs-Kotlin\u306e\u62e1\u5f35\u95a2\u6570\">Go\u306eMethods continued vs Kotlin\u306e\u62e1\u5f35\u95a2\u6570<\/h2>\n<p>Go\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001struct\u3067\u5b9a\u7fa9\u3057\u305f\u578b\u4ee5\u5916\u306e\u578b\u306b\u5bfe\u3057\u3066\u3082\u5b9a\u7fa9\u3067\u304d\u308b\u3002<a target=\"_blank\" href=\"#f-b51ecb4b\" id=\"fn-b51ecb4b\" name=\"fn-b51ecb4b\" title=\"\u30ec\u30b7\u30fc\u30d0\u30fc\u3092\u5f15\u6570\u306b\u6e21\u3059\u3001\u3068\u3044\u3046\u3053\u3068\u3055\u3048\u3059\u308c\u3070\u3088\u3044\">*2<\/a><\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"math\"<\/span>\n)\n\n<span class=\"synStatement\">type<\/span> MyFloat <span class=\"synType\">float64<\/span>\n\n<span class=\"synStatement\">func<\/span> (f MyFloat) Abs() <span class=\"synType\">float64<\/span> {\n    <span class=\"synStatement\">if<\/span> f 0 {\n        <span class=\"synStatement\">return<\/span> <span class=\"synType\">float64<\/span>(-f)\n    }\n    <span class=\"synStatement\">return<\/span> <span class=\"synType\">float64<\/span>(f)\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    f := MyFloat(-math.Sqrt2)\n    fmt.Println(f.Abs())\n}\n<\/pre>\n<p>Go\u306eMethods continued\u306f\u30e1\u30bd\u30c3\u30c9\u306f\u5143\u306e\u578b\u306b\u300c\u5c5e\u3059\u308b\u300d\u5f62\u3067\u5b9a\u7fa9\u3055\u308c\u308b\u304c\u3001Kotlin\u306e\u62e1\u5f35\u95a2\u6570\u306f\u5143\u306e\u578b\u306b\u5c5e\u3055\u305a\u5b9a\u7fa9\u3055\u308c\u308b\u3042\u304f\u307e\u3067<strong>\u62e1\u5f35<\/strong>\u95a2\u6570\u3002\u306a\u306e\u3067\u3001Kotlin\u306e\u62e1\u5f35\u95a2\u6570\u306f\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u3055\u308c\u306a\u3044\u3002<\/p>\n<h2 id=\"\u5909\u6570\u30ec\u30b7\u30fc\u30d0\u30fc\u3068\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc\">\u5909\u6570\u30ec\u30b7\u30fc\u30d0\u30fc\u3068\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc<\/h2>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"math\"<\/span>\n)\n\n<span class=\"synStatement\">type<\/span> Vertex <span class=\"synStatement\">struct<\/span> {\n    X, Y <span class=\"synType\">float64<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> (v Vertex) Abs() <span class=\"synType\">float64<\/span> {\n    <span class=\"synStatement\">return<\/span> math.Sqrt(v.X*v.X + v.Y*v.Y)\n}\n\n<span class=\"synStatement\">func<\/span> (v *Vertex) Scale(f <span class=\"synType\">float64<\/span>) {\n    v.X = v.X * f\n    v.Y = v.Y * f\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    v := Vertex{<span class=\"synConstant\">3<\/span>, <span class=\"synConstant\">4<\/span>}\n    v.Scale(<span class=\"synConstant\">10<\/span>)\n    fmt.Println(v.Abs())\n}\n<\/pre>\n<ul>\n<li>\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc\u3067\u3042\u308c\u3070\u3001\u30ec\u30b7\u30fc\u30d0\u81ea\u4f53\u304c\u6301\u3064\u5024\u3092\u5909\u66f4\u3067\u304d\u308b<\/li>\n<li>\u5909\u6570\u30ec\u30b7\u30fc\u30d0\u30fc\u306f\u3067\u304d\u306a\u3044<\/li>\n<\/ul>\n<p>\u3064\u307e\u308a\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306f\u30ec\u30b7\u30fc\u30d0\u30fc\u306b\u5bfe\u3057\u3066\u526f\u4f5c\u7528\u304c\u3042\u308b\u304b\u3082\u3057\u308c\u306a\u3044\u304c\u3001\u5909\u6570\u30ec\u30b7\u30fc\u30d0\u3067\u5b9a\u7fa9\u3055\u308c\u305f\u30e1\u30bd\u30c3\u30c9\u306f\u30ec\u30b7\u30fc\u30d0\u30fc\u306b\u5bfe\u3057\u3066\u526f\u4f5c\u7528\u304c\u306a\u3044\u3068\u3044\u3046\u3053\u3068\u306b\u306a\u308b\u3002<\/p>\n<p>\u307e\u305f\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc\u304c\u5de8\u5927\u306a\u5834\u5408\u306b\u5909\u6570\u30ec\u30b7\u30fc\u30d0\u30fc\u3092\u591a\u7528\u3059\u308b\u3068\u6bce\u5ea6\u5909\u6570\u30b3\u30d4\u30fc\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5927\u304d\u304f\u306a\u308b\u3002<\/p>\n<h2 id=\"\u4e00\u822c\u7684\u306b\u306f\u5909\u6570\u30ec\u30b7\u30fc\u30d0-\u307e\u305f\u306f-\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u306e\u3069\u3061\u3089\u304b\u3067\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4e0e\u3048\u6df7\u5728\u3055\u305b\u308b\u3079\u304d\u3067\u306f\u306a\u3044\">\u4e00\u822c\u7684\u306b\u306f\u5909\u6570\u30ec\u30b7\u30fc\u30d0 \u307e\u305f\u306f \u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u306e\u3069\u3061\u3089\u304b\u3067\u3059\u3079\u3066\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4e0e\u3048\u3001\u6df7\u5728\u3055\u305b\u308b\u3079\u304d\u3067\u306f\u306a\u3044<\/h2>\n<p>\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u6642\u306b\u7834\u7dbb\u3059\u308b\u304b\u3089\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> Printer <span class=\"synStatement\">interface<\/span> {\n    Print()\n}\n\n<span class=\"synStatement\">type<\/span> Incrementer <span class=\"synStatement\">interface<\/span> {\n    Increment()\n}\n\n<span class=\"synStatement\">type<\/span> Counter <span class=\"synStatement\">struct<\/span> {\n    n <span class=\"synType\">int<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> (c Counter) Print() { fmt.Println(c.n) }     \n<span class=\"synStatement\">func<\/span> (c *Counter) Increment() { c.n++ }            \n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">var<\/span> p Printer = Counter{} \n    <span class=\"synStatement\">var<\/span> i Incrementer = Counter{} \n}\n<\/pre>\n<p><code>i<\/code>\u306b\u4ee3\u5165\u3057\u3088\u3046\u3068\u3057\u3066\u3082\u3001<code>Counter<\/code>\u306f\u5024\u306e\u305f\u3081<code>func (c *Counter) Increment() { c.n++ }<\/code>\u3092\u6e80\u305f\u3055\u305a\u3001\u4ee3\u5165\u3067\u304d\u306a\u3044\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">var<\/span> i <span class=\"synStatement\">interface<\/span>{} = <span class=\"synConstant\">\"hello\"<\/span>\n\n    s := i.(<span class=\"synType\">string<\/span>)\n    fmt.Println(s)\n\n    s, ok := i.(<span class=\"synType\">string<\/span>)\n    fmt.Println(s, ok)\n\n    f, ok := i.(<span class=\"synType\">float64<\/span>)\n    fmt.Println(f, ok)\n\n    f = i.(<span class=\"synType\">float64<\/span>) \n    fmt.Println(f)\n}\n<\/pre>\n<p>switch\u306b\u3088\u308b\u5206\u5c90\u3082\u3067\u304d\u308b\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> do(i <span class=\"synStatement\">interface<\/span>{}) {\n    <span class=\"synStatement\">switch<\/span> v := i.(<span class=\"synStatement\">type<\/span>) {\n    <span class=\"synStatement\">case<\/span> <span class=\"synType\">int<\/span>:\n        fmt.Printf(<span class=\"synConstant\">\"Twice %v is %v<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, v, v*<span class=\"synConstant\">2<\/span>)\n    <span class=\"synStatement\">case<\/span> <span class=\"synType\">string<\/span>:\n        fmt.Printf(<span class=\"synConstant\">\"%q is %v bytes long<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, v, <span class=\"synStatement\">len<\/span>(v))\n    <span class=\"synStatement\">default<\/span>:\n        fmt.Printf(<span class=\"synConstant\">\"I don't know about type %T!<\/span><span class=\"synSpecial\">\\n<\/span><span class=\"synConstant\">\"<\/span>, v)\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    do(<span class=\"synConstant\">21<\/span>)\n    do(<span class=\"synConstant\">\"hello\"<\/span>)\n    do(<span class=\"synStatement\">true<\/span>)\n}\n<\/pre>\n<h2 id=\"go\u3067\u4ee3\u6570\u7684\u30c7\u30fc\u30bf\u578b\u306f\u8868\u73fe\u3067\u304d\u308b\">go\u3067\u4ee3\u6570\u7684\u30c7\u30fc\u30bf\u578b\u306f\u8868\u73fe\u3067\u304d\u308b\uff1f<\/h2>\n<p>\u76f4\u548c\u578b(<code>enum<\/code>)\u304c\u306a\u3044\u304b\u3089\u7121\u7406\u3002\u3088\u3063\u3066<code>default<\/code>\u306f\u5b9f\u8cea\u3059\u3079\u3066<code>panic<\/code>\u6271\u3044\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n\n<span class=\"synStatement\">type<\/span> Expr <span class=\"synStatement\">interface<\/span>{}\n\n\n<span class=\"synStatement\">type<\/span> Add <span class=\"synStatement\">struct<\/span> {\n    Left, Right Expr\n}\n\n\n<span class=\"synStatement\">type<\/span> Number <span class=\"synStatement\">struct<\/span> {\n    Value <span class=\"synType\">int<\/span>\n}\n\n\n<span class=\"synStatement\">func<\/span> Eval(e Expr) <span class=\"synType\">int<\/span> {\n    <span class=\"synStatement\">switch<\/span> v := e.(<span class=\"synStatement\">type<\/span>) {\n    <span class=\"synStatement\">case<\/span> Number:\n        <span class=\"synStatement\">return<\/span> v.Value\n    <span class=\"synStatement\">case<\/span> Add:\n        <span class=\"synStatement\">return<\/span> Eval(v.Left) + Eval(v.Right)\n    <span class=\"synStatement\">default<\/span>:\n        <span class=\"synStatement\">panic<\/span>(fmt.Sprintf(<span class=\"synConstant\">\"unknown expression: %T\"<\/span>, v))\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    \n    expr := Add{\n        Left: Number{<span class=\"synConstant\">1<\/span>},\n        Right: Add{\n            Left:  Number{<span class=\"synConstant\">2<\/span>},\n            Right: Number{<span class=\"synConstant\">3<\/span>},\n        },\n    }\n\n    \n    result := Eval(expr)\n    fmt.Println(result) \n}\n<\/pre>\n<h2 id=\"\u306a\u3093\u3067Go\u306b\u306fenum\u304c\u306a\u3044\u3093\u3060\u308d\u3046\">\u306a\u3093\u3067Go\u306b\u306f<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/enum\">enum<\/a>\u304c\u306a\u3044\u3093\u3060\u308d\u3046\uff1f<\/h2>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgithub.com%2Fgolang%2Fgo%2Fissues%2F19814\" title=\"proposal: spec: add typed enum support \u00b7 Issue #19814 \u00b7 golang\/go\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/github.com\/golang\/go\/issues\/19814\">github.com<\/a><\/cite><\/p>\n<p>\u3053\u306eissue\u304c\u305d\u3046\u3002<\/p>\n<ul>\n<li>Go\u306e\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u554f\u984c<\/li>\n<li>\u5916\u90e8\u5165\u529b\u6642\u306e\u51e6\u7406<\/li>\n<\/ul>\n<p>\u3053\u3053\u304c\u30cf\u30fc\u30c9\u30eb\u306b\u306a\u3063\u3066\u3044\u308b\u3063\u307d\u3044\u3002\u305f\u3057\u304b\u306b\u672a\u5b9a\u7fa9\u306e<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/enum\">enum<\/a>\u3092\u4f55\u3068\u3057\u3066\u6271\u3046\u304b\uff1f\u306f\u60a9\u307e\u3057\u3044\u304b\u3082\u3002\u3051\u3069<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/nil\">nil<\/a>\u3067\u3044\u3044\u3088\u3046\u306a\u6c17\u3082\u3059\u308b\u304c&#8230;\ud83e\udd14<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">type<\/span> <span class=\"synType\">error<\/span> <span class=\"synStatement\">interface<\/span> {\n    Error() <span class=\"synType\">string<\/span>\n}\n<\/pre>\n<p>\u4e8b\u524d\u5b9a\u7fa9\u3055\u308c\u305f\u3053\u3044\u3064\u3092\u4f7f\u3063\u3066\u72ec\u81ea\u30a8\u30e9\u30fc\u3092\u5b9a\u7fa9\u3059\u308b\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"time\"<\/span>\n)\n\n<span class=\"synStatement\">type<\/span> MyError <span class=\"synStatement\">struct<\/span> {\n    When time.Time\n    What <span class=\"synType\">string<\/span>\n}\n\n<span class=\"synStatement\">func<\/span> (e *MyError) Error() <span class=\"synType\">string<\/span> {\n    <span class=\"synStatement\">return<\/span> fmt.Sprintf(<span class=\"synConstant\">\"at %v, %s\"<\/span>,\n        e.When, e.What)\n}\n\n<span class=\"synStatement\">func<\/span> run() <span class=\"synType\">error<\/span> {\n    <span class=\"synStatement\">return<\/span> &amp;MyError{\n        time.Now(),\n        <span class=\"synConstant\">\"it didn't work\"<\/span>,\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">if<\/span> err := run(); err != <span class=\"synStatement\">nil<\/span> {\n        fmt.Println(err)\n    }\n}\n<\/pre>\n<h2 id=\"Goroutine\">Goroutine<\/h2>\n<p>\u6700\u521d\u306e\u4e00\u6b69<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n    <span class=\"synConstant\">\"time\"<\/span>\n)\n\n<span class=\"synStatement\">func<\/span> say(s <span class=\"synType\">string<\/span>) {\n    <span class=\"synStatement\">for<\/span> i := <span class=\"synConstant\">0<\/span>; i 5; i++ {\n        time.Sleep(<span class=\"synConstant\">100<\/span> * time.Millisecond)\n        fmt.Println(s)\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    <span class=\"synStatement\">go<\/span> say(<span class=\"synConstant\">\"world\"<\/span>)\n    say(<span class=\"synConstant\">\"hello\"<\/span>)\n}\n<\/pre>\n<h2 id=\"Channels\">Channels<\/h2>\n<ul>\n<li>\u30c1\u30e3\u30cd\u30eb\u3078\u5024\u3092\u9001\u308b\n<\/li>\n<li>\u30c1\u30e3\u30cd\u30eb\u304b\u3089\u53d7\u4fe1\u3057\u305f\u5909\u6570\u3092\u4ee3\u5165\n<\/li>\n<li>\u30c1\u30e3\u30cd\u30eb\u3092\u4f5c\u308b\n<\/li>\n<\/ul>\n<p>\u30c1\u30e3\u30cd\u30eb\u306f<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> sum(s []<span class=\"synType\">int<\/span>, c <span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>) {\n    sum := <span class=\"synConstant\">0<\/span>\n    <span class=\"synStatement\">for<\/span> _, v := <span class=\"synStatement\">range<\/span> s {\n        sum += v\n    }\n    fmt.Println(<span class=\"synConstant\">\"this is sum = \"<\/span>, sum)\n    c \/\/ send sum to c\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    s := []<span class=\"synType\">int<\/span>{<span class=\"synConstant\">7<\/span>, <span class=\"synConstant\">2<\/span>, <span class=\"synConstant\">8<\/span>, -<span class=\"synConstant\">9<\/span>, <span class=\"synConstant\">4<\/span>, <span class=\"synConstant\">0<\/span>}\n\n    c := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>)\n    <span class=\"synStatement\">go<\/span> sum(s[:<span class=\"synStatement\">len<\/span>(s)\/<span class=\"synConstant\">2<\/span>], c)\n    fmt.Println(<span class=\"synConstant\">\"A\"<\/span>)\n    <span class=\"synStatement\">go<\/span> sum(s[<span class=\"synStatement\">len<\/span>(s)\/<span class=\"synConstant\">2<\/span>:], c)\n    fmt.Println(<span class=\"synConstant\">\"B\"<\/span>)\n    x, y := \/\/ receive from c\n    fmt.Println(<span class=\"synConstant\">\"C\"<\/span>)\n\n    fmt.Println(x, y, x+y)\n}\n<\/pre>\n<p>\u4f55\u56de\u304b\u5b9f\u884c\u3057\u305f\u51fa\u529b\u3002\u975e\u540c\u671f\u306b\u51e6\u7406\u3055\u308c\u305f\u306e\u304c\u308f\u304b\u308b\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\"># 1\nA\nB\nthis is sum =  -5\nthis is sum =  17\nC\n-5 17 12\n\n#2\nA\nB\nthis is sum =  17\nthis is sum =  -5\nC\n17 -5 12\n\n#3\nA\nthis is sum =  17\nB\nthis is sum =  -5\nC\n17 -5 12\n<\/pre>\n<h2 id=\"Buffered-Channels\">Buffered Channels<\/h2>\n<p>\u30d0\u30c3\u30d5\u30a1\u4ed8\u304d\u306e\u30c1\u30e3\u30cd\u30eb\u3002<\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> main() {\n    ch := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>, <span class=\"synConstant\">2<\/span>)\n    ch 1\n    ch 2\n    ch 3 \n    fmt.Println(\n\n\n<p>\u7d50\u679c<\/p>\n\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">fatal error: all goroutines are asleep - deadlock!\n\ngoroutine 1 [chan send]:\nmain.main()\n    \/tmp\/sandbox2970589188\/prog.go:9 +0x58<\/pre>\n<h2 id=\"Range-and-Close\">Range and Close<\/h2>\n<ul>\n<li><code>close(ch)<\/code>\u3067\u30c1\u30e3\u30cd\u30eb\u3092\u9589\u3058\u308b<\/li>\n<li><code>v, ok := \u3067<code>ok<\/code>\u304c<code>false<\/code>\u306a\u3089\u30c1\u30e3\u30cd\u30eb\u306f\u9589\u3058\u3066\u3044\u308b<\/code><\/li>\n<\/ul>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> (\n    <span class=\"synConstant\">\"fmt\"<\/span>\n)\n\n<span class=\"synStatement\">func<\/span> fibonacci(n <span class=\"synType\">int<\/span>, c <span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>) {\n    x, y := <span class=\"synConstant\">0<\/span>, <span class=\"synConstant\">1<\/span>\n    <span class=\"synStatement\">for<\/span> i := <span class=\"synConstant\">0<\/span>; i close(c)\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    c := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>, <span class=\"synConstant\">10<\/span>)\n    <span class=\"synStatement\">go<\/span> fibonacci(<span class=\"synStatement\">cap<\/span>(c), c)\n    v, ok :=  c\n    fmt.Println(v, ok)\n    <span class=\"synStatement\">for<\/span> i := <span class=\"synStatement\">range<\/span> c {\n        v2, ok2 :=  c\n        fmt.Println(v2, ok2)\n        fmt.Println(i)\n    }\n    v3, ok3 :=  c\n    fmt.Println(v3, ok3)\n}\n<\/pre>\n<p>\u51fa\u529b\u3002\u304a\u305d\u3089\u304f<code>close<\/code>\u304c\u975e\u540c\u671f\u3067\u8d70\u3063\u305f\u30bf\u30a4\u30df\u30f3\u30b0\u304b\u3089<code>false<\/code>\u306b\u5909\u308f\u3063\u3066\u3044\u308b\u3002<\/p>\n<pre class=\"code\" data-lang=\"\" data-unlink=\"\">0 true\n1 true\n1\n3 true\n2\n8 true\n5\n21 true\n13\n0 false\n34\n0 false<\/pre>\n<h2 id=\"Select\">Select<\/h2>\n<p>\u6e96\u5099\u304c\u3067\u304d\u305f<code>case<\/code>\u306e\u3046\u3061\u5b9f\u884c\u3067\u304d\u308b\u3082\u306e\u3092\u5b9f\u884c\u3059\u308b\u3002<code>case<\/code>\u304c\u8907\u6570\u3042\u308c\u3070\u30e9\u30f3\u30c0\u30e0\u306b\u6c7a\u307e\u308b\u3002\u63b2\u8f09\u3055\u308c\u3066\u3044\u308b\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u52d5\u304d\u306f\u308f\u304b\u3063\u305f\u3051\u3069\u3001\u3053\u308c\u3060\u3068\u7d76\u5bfe\u6700\u5f8c\u306b<code>case \u3067<code>return<\/code>\u3068\u3057\u30b4\u30eb\u30fc\u30c1\u30f3\u304c\u7d42\u308f\u308b\u306e\u3067\u3001\u3042\u3093\u307e\u308a\u3044\u3044\u30b5\u30f3\u30d7\u30eb\u3058\u3083\u306a\u3044\u3002<\/code><\/p>\n<pre class=\"code lang-go\" data-lang=\"go\" data-unlink=\"\"><span class=\"synStatement\">package<\/span> main\n\n<span class=\"synStatement\">import<\/span> <span class=\"synConstant\">\"fmt\"<\/span>\n\n<span class=\"synStatement\">func<\/span> fibonacci(c, quit <span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>) {\n    x, y := <span class=\"synConstant\">0<\/span>, <span class=\"synConstant\">1<\/span>\n    <span class=\"synStatement\">for<\/span> {\n        <span class=\"synStatement\">select<\/span> {\n        <span class=\"synStatement\">case<\/span> c case \"quit\")\n            <span class=\"synStatement\">return<\/span>\n        }\n    }\n}\n\n<span class=\"synStatement\">func<\/span> main() {\n    c := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>)\n    quit := <span class=\"synStatement\">make<\/span>(<span class=\"synType\">chan<\/span> <span class=\"synType\">int<\/span>)\n    <span class=\"synStatement\">go<\/span> <span class=\"synType\">func<\/span>() {\n        <span class=\"synStatement\">for<\/span> i := <span class=\"synConstant\">0<\/span>; i 10; i++ {\n            fmt.Println(0\n    }()\n    fibonacci(c, quit)\n}\n<\/pre>\n<ul>\n<li>\u6587\u6cd5\u3084\u8003\u3048\u65b9\u304c\u3081\u3063\u3061\u3083\u30b7\u30f3\u30d7\u30eb\u3067\u899a\u3048\u3084\u3059\u3044<\/li>\n<li>\u57fa\u672c\u6587\u6cd5\u306f1\u65e5\u3042\u308c\u3070\u3072\u3068\u3055\u3089\u3044\u3067\u304d\u305f(\u6c17\u304c\u3059\u308b)\n<ul>\n<li>&#8220;A Tour of Go&#8221;\u304c\u6559\u6750\u3068\u3057\u3066\u512a\u79c0\u8aac\u306f\u3042\u308b<\/li>\n<li>\u3042\u3068\u3088\u304f\u308f\u304b\u3089\u3093\u3068\u3053\u308d\u3068\u304b\u7591\u554f\u70b9\u306f\u90fd\u5ea6ChatGPT\u306b\u6559\u3048\u3066\u3082\u3089\u3063\u3066\u305f<\/li>\n<\/ul>\n<\/li>\n<li><code>interface<\/code>\u304c\u4ed6\u8a00\u8a9e\u3068\u8003\u3048\u65b9\u304c\u9055\u3063\u3066\u5c11\u3057\u6238\u60d1\u3063\u305f\u3002\u7279\u306b\u30dd\u30a4\u30f3\u30bf\u30ec\u30b7\u30fc\u30d0\u30fc\u3042\u305f\u308a<\/li>\n<li>\u6587\u6cd5\u3084\u8003\u3048\u65b9\u304c\u3081\u3063\u3061\u3083\u30b7\u30f3\u30d7\u30eb\u306a\u306e\u304c\u308f\u304b\u3063\u305f\u306e\u3067\u3001\u4eca\u306e\u72b6\u614b\u3067\u300e\u521d\u3081\u3066\u306eGo\u8a00\u8a9e\u300f\u3084\u4e09\u4e95\u3055\u3093(<a target=\"_blank\" href=\"http:\/\/blog.hatena.ne.jp\/todays_mitsui\/\" class=\"hatena-id-icon\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/cdn.profile-image.st-hatena.com\/users\/todays_mitsui\/profile.png\" width=\"16\" height=\"16\" alt=\"\" class=\"hatena-id-icon\"\/>id:todays_mitsui<\/a>)\u306b\u3082\u3089\u3063\u305f\u300e\u52b9\u7387\u7684\u306aGo\u300f\u3092\u8aad\u3080\u3068\u3081\u3063\u3061\u3083\u9762\u767d\u304f\u8aad\u3081\u305d\u3046<\/li>\n<li>\u3044\u308d\u3093\u306a\u8a00\u8a9e\u306e\u52c9\u5f37\u3092\u7d99\u7d9a\u7684\u306b\u3057\u3066\u308b\u3068\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u5fc5\u8981\u306a\u8981\u7d20\u304c\u5927\u4f53\u308f\u304b\u308b\u306e\u3067\u30ad\u30e3\u30c3\u30c1\u30a2\u30c3\u30d7\u306b\u304b\u304b\u308b\u6642\u9593\u304c\u5e74\u3005\u77ed\u304f\u306a\u3063\u3066\u3044\u3063\u3066\u308b\u6c17\u304c\u3059\u308b<a target=\"_blank\" href=\"#f-a9210f30\" id=\"fn-a9210f30\" name=\"fn-a9210f30\" title=\"\u305f\u3060\u3057Rust\u3001\u30c6\u30e1\u30fc\u306f\u4f8b\u5916\u3084\u3002\u3080\u305a\u3059\u304e\u308b\">*3<\/a><\/li>\n<\/ul>\n<p>\u305f\u3076\u3093\u666e\u901a\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%A5%BD%A1%BC%A5%B9%A5%B3%A1%BC%A5%C9\">\u30bd\u30fc\u30b9\u30b3\u30fc\u30c9<\/a>\u306f\u8aad\u3081\u308b\u3088\u3046\u306b\u306a\u3063\u305f\u3068\u601d\u3046\u306e\u3067\u3001<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/%B6%AF%B2%BD%B3%D8%BD%AC\">\u5f37\u5316\u5b66\u7fd2<\/a>\u3068\u304a\u4f5c\u6cd5\u306e\u7fd2\u5f97\u306e\u305f\u3081\u306b<code>echo<\/code>\u3092\u89e3\u6790\u3057\u3066\u307f\u308b\u3002<\/p>\n<p><iframe src=\"https:\/\/hatenablog-parts.com\/embed?url=https%3A%2F%2Fgithub.com%2Flabstack%2Fecho\" title=\"GitHub - labstack\/echo: High performance, minimalist Go web framework\" class=\"embed-card embed-webcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 155px; max-width: 500px; margin: 10px 0px;\" loading=\"lazy\"><\/iframe><cite class=\"hatena-citation\"><a target=\"_blank\" href=\"https:\/\/github.com\/labstack\/echo\">github.com<\/a><\/cite><\/p>\n<p>\u3064\u3044\u3067\u306b<a target=\"_blank\" class=\"keyword\" href=\"https:\/\/d.hatena.ne.jp\/keyword\/IDE\">IDE<\/a>(<code>GoLand<\/code>)\u306b\u3082\u6163\u308c\u3066\u3044\u304f\u3002<\/p>\n<\/div>\n\n<br \/><a href=\"https:\/\/blog.inorinrinrin.com\/entry\/2025\/10\/07\/215258\">\u5143\u306e\u8a18\u4e8b\u3092\u78ba\u8a8d\u3059\u308b <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"\u8ee2\u8077\u5148\u3067Go\u3092\u3084\u308b\u3063\u3066\u805e\u3044\u3066\u305f\u306e\u3067\u6709\u7d66\u6d88\u5316\u4e2d\u306b\u300e\u521d\u3081\u3066\u306eGo\u8a00\u8a9e\u300f\u3092\u8aad\u3093\u3067\u3044\u305f\u3002 \u3051\u3069\u305d\u308c\u3088\u308a\u3082\u5148\u306bA Tour of Go\u3092\u3084\u3063\u3068\u304f\u306e\u304c\u6b63\u89e3\u3060\u3063\u305f*1\u3002\u66f8\u7c4d\u81ea\u4f53\u306fGo\u8a00\u8a9e\u306e\u4ed5\u69d8\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u66f8\u304b\u308c\u3066\u3044\u3066\u3081\u3063\u3061\u3083\u3044\u3044\u672c\u306a [&hellip;]","protected":false},"author":1,"featured_media":8515,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[2],"tags":[],"class_list":["post-8514","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-hatena-blog"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Gopher\u30c7\u30d3\u30e5\u30fc\u3059\u308b\u306e\u3067A Tour of Go\u3092\u4e00\u901a\u308a\u3084\u3063\u305f - \u7a7a\u306e\u7bb1 - \u30dd\u30b1\u30b3\u30f3<\/title>\n<meta name=\"robots\" content=\"index, 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