{"id":5069,"date":"2020-09-05T20:19:13","date_gmt":"2020-09-05T11:19:13","guid":{"rendered":"https:\/\/greentown.tokyo\/?p=5069"},"modified":"2020-09-05T20:20:24","modified_gmt":"2020-09-05T11:20:24","slug":"programminglanguage-go4","status":"publish","type":"post","link":"https:\/\/greentown.tokyo\/?p=5069","title":{"rendered":"\u7b2c\uff14\u56de\u300c\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9eGo\u300d\u30aa\u30f3\u30e9\u30a4\u30f3\u8aad\u66f8\u4f1a"},"content":{"rendered":"\n<p>\u7b2c\uff13\u56de\u76ee\u3092\u66f8\u3044\u3066\u3044\u307e\u305b\u3093\u301c<\/p>\n<p>\u4eca\u56de\u306f4\u56de\u76ee\u306e\u53c2\u52a0\u3067\u3057\u305f\u3002<\/p>\n<p>\u306f\u3058\u3081\u306b\u3001\u8efd\u304f\u81ea\u5df1\u7d39\u4ecb\u3002\u53c2\u52a0\u8005\u306f20\u540d\u304f\u3089\u3044\u3067\u3057\u305f\u3002<\/p>\n<h2>\u307e\u3048\u3075\u308a<\/h2>\n<p><span>Java\u30d0\u30fc\u30b8\u30e7\u30f3\u305f\u304f\u3055\u3093\u3042\u3063\u3066\u3001\u30b3\u30fc\u30c9\u306e\u30e1\u30f3\u30c6\u304c\u5927\u5909\u3002<\/span><br \/><span>Go\u306f8\u5e74\u305f\u3063\u305f\u8a00\u8a9e\u4ed5\u69d8\u306f\u3042\u307e\u308a\u304b\u308f\u3063\u3066\u306a\u3044\u3002\u5927\u5e45\u306a\u5909\u66f4\u306f\u6765\u5e74\u304b\u3082\u3002<\/span><br \/><span>Go\u306eGenerics\u642d\u8f09\u306f\u3001\u306f\u3084\u304f\u30661.17\u3002<\/span><\/p>\n<p>\u4eca\u65e5\u306f\u7b2c\uff13\u7ae0\u306e\u7d9a\u304d\u304b\u3089\u3002<\/p>\n<h2>\u7b2c\uff13\u7ae0\u7d9a\u304d\u304b\u3089<\/h2>\n<h3>3.6 \u5b9a\u6570<\/h3>\n<ul>\n<li><span>\u5b9a\u6570\u540c\u58eb\u306e\u8a08\u7b97\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u3084\u3063\u3066\u304f\u308c\u308b\u3002\uff08\u9700\u8981\u306f\u3042\u308b\u306e\u304b\u306a\u301c\uff1f\uff09<\/span><\/li>\n<li>iota\uff08\u3044\u304a\u305f\uff09\n<ul>\n<li><span>const\u5ba3\u8a00\u306e\u6700\u521d\u306b\u304b\u304b\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3002\u3067\u306a\u3044\u30680\u304b\u3089\u59cb\u307e\u3089\u306a\u3044\u3002<\/span><\/li>\n<li><span>iota\u306fAPL\u8a00\u8a9e\uff08IBM\u306e\u30e1\u30a4\u30f3\u30d5\u30ec\u30fc\u30e0\u3067\u52d5\u3044\u3066\u305f\uff09\u304b\u3089\u304d\u3066\u3044\u308b\u3002<\/span><\/li>\n<li><span>iota\u306fconst\u30d6\u30ed\u30c3\u30af\u3067\u56f2\u307e\u308c\u305f\u884c\u3054\u3068\u306eindex\u3092\u8fd4\u3057\u3066\u3044\u308b\u3060\u3051\u3002<\/span><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<div class=\"clip-memobox st-text-guide st-text-guide-memo\" style=\"background:#fafafa;color:#000000;\"><div class=\"clip-fonticon\" style=\"color:#919191;border-color:#E0E0E0;\"><i class=\"st-fa fa-pencil st-css-no\" aria-hidden=\"true\"><\/i><\/div><div class=\"clip-memotext\"><p style=\"color:#000000;\"><\/p>\n<p>\u8f2a\u8aad\u4f1a\u5f8c\u306e\u8cea\u554f\uff06\u96d1\u8ac7\u30bf\u30a4\u30e0\u3067\u306e\u30e1\u30e2<\/p>\n<p><span>Java\u306efinal\u306b\u3064\u3044\u3066\u3061\u3087\u3063\u3068\u805e\u3044\u3066\u307f\u305f\u3002<\/span><br \/><span>const\u306f\u5b9a\u6570\u3002<\/span><br \/><span>final\u306f\u5909\u6570\u3001\u4e00\u5ea6\u5024\u3092\u3044\u308c\u305f\u3089\u5909\u66f4\u3067\u304d\u306a\u3044\uff08\u5b9f\u884c\u6642\u306b\u6c7a\u307e\u308b\uff09<\/span><\/p>\n<\/div><\/div>\n<ul>\n<li><span>Go\u306f\u578b\u304c\u9055\u3046\u3068\u6f14\u7b97\u3055\u305b\u3066\u304f\u308c\u306a\u3044\u3051\u3069\u3001\u5b9a\u6570\u306f\u6f14\u7b97\u3055\u305b\u3066\u304f\u308c\u308b\u3002\uff08\u578b\u304c\u306a\u3044\u304b\u3089&#8230;..\uff1f\uff09<\/span><\/li>\n<\/ul>\n<p>\u5b9a\u6570\u3092\u4ee3\u5165\u3059\u308b\u3068\u304d\u306f\u3001\u30ad\u30e3\u30b9\u30c8\u3068\u304b\u305b\u305a\u305d\u306e\u307e\u307e\u4ee3\u5165\u3067\u304d\u308b\u3002\u578b\u306b\u3088\u3063\u3066\u306f\u7cbe\u5ea6\u304c\u304a\u3061\u308b\uff1f<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plane\" data-file=\"GoLnag\"><code>const Pi 64 float64 = math.Pi\n\nvar x float32 = float32(Pi64)\nvar y float65 = Pi64\nvar z complex128 = complex128(Pi64) \/\/ \u3053\u308c\u306f\u306a\u3093\u3066\u8a00\u3063\u3066\u305f\u3063\u3051\uff1f<\/code><\/pre><\/div>\n\n\n\n<p>rune\u306f int32 \u3068\u304a\u3093\u306a\u3058\u3002<\/p>\n\n\n\n<p>Go\u306f\u578b\u304c\u9055\u3046\u3068\u8a08\u7b97\u3067\u304d\u306a\u3044\u306e\u306b\u3001\u5b9a\u6570\u306f\u3067\u304d\u308b..\u306a\u3093\u3067\uff1f\u3068\u304a\u3082\u3063\u305f\u3089\u3053\u306e\u7ae0\u3092\u601d\u3044\u51fa\u3057\u3066\u306d\u3001\u3068\u306e\u3053\u3068\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u7b2c\uff14\u7ae0 \u30b3\u30f3\u30dd\u30b8\u30c3\u30c8\u578b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">4.1 \u914d\u5217<\/h3>\n\n\n\n<p><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plane\"><code>var q[3]int = [3]int{1, 2, 3}\nvar r[3]int = [3]int{1, 2}\nfmt.Println(r[2]) \/\/ \u7d50\u679c 0 \u2190\u521d\u671f\u5024\u304c\u5165\u308b<\/code><\/pre><\/div>\n\n\n\n<ul>\n<li>[2]int == [3]int \u8981\u7d20\u6570\u304c\u9055\u3046\u3068\u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff08\u4f7f\u3046\u3053\u3068\u306a\u3044\u3051\u3069\uff09<\/li>\n<\/ul>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plane\" data-file=\"Go\"><code>[]byte(&quot;Hello \u65e5\u672c&quot;)\n[]rune(&quot;Hello \u65e5\u672c&quot;)\n\/\/ \u7570\u306a\u308b\u7d50\u679c\u304c\u8fd4\u308b\u3002<\/code><\/pre><\/div>\n\n\n\n<ul>\n<li><span>Go\u306e\u914d\u5217\u30b3\u30d4\u30fc\u306f\u3001\u5024\u306e\u30b3\u30d4\u30fc\uff08\u3069\u3093\u306a\u306b\u5927\u304d\u304f\u3066\u3082\uff01\uff09\u3002C\u8a00\u8a9e\u306e\u914d\u5217\u30b3\u30d4\u30fc\u306f\u30a2\u30c9\u30ec\u30b9\u30b3\u30d4\u30fc\u3002<\/span><\/li>\n<\/ul>\n<p>\u2191\u3053\u308c\u306f\u95a2\u6570\u306e\u3068\u304d\u306d\uff08\u5ca9\u7530\u30d7\u30ed\uff09<\/p>\n<p><a href=\"https:\/\/twitter.com\/qt_luigi\/status\/1302119046574268416?s=20\">https:\/\/twitter.com\/qt_luigi\/status\/1302119046574268416?s=20<\/a><\/p>\n<h3>4.2 \u30b9\u30e9\u30a4\u30b9<\/h3>\n<p>\u697d\u3057\u3044\u30b9\u30e9\u30a4\u30b9\u3002<\/p>\n<ul>\n<li><span>\u30b9\u30e9\u30a4\u30b9\u306f\u3001\u914d\u5217\u306e\u8981\u7d20\u306e\u90e8\u5206\u3078\u30a2\u30af\u30bb\u30b9\u3059\u308b\u8efd\u91cf\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u3057\u3066\u3044\u308b\u3002<\/span><\/li>\n<li><span>\u8907\u6570\u306e\u30b9\u30e9\u30a4\u30b9\u304c\u540c\u3058\u57fa\u5e95\u914d\u5217\u3092\u5171\u6709\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002<\/span><\/li>\n<li><span>\u30b9\u30e9\u30a4\u30b9\u6f14\u7b97\u5b50\u306f\u65b0\u305f\u306a\u30b9\u30e9\u30a4\u30b9\u3092\u751f\u6210\u3059\u308b\u3002<\/span><\/li>\n<li><span>\u30b9\u30e9\u30a4\u30b9\u578b\u306e\u30bc\u30ed\u5024\u306fnil\u3002<\/span><\/li>\n<li><span>nil\u30b9\u30e9\u30a4\u30b9\u306f\u57fa\u5e95\u914d\u5217\u3092\u6301\u305f\u306a\u3044\u3002<\/span><\/li>\n<\/ul>\n<p><span>\u30b9\u30e9\u30a4\u30b9\u304c\u7a7a\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3068\u304d<\/span><\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plane\"><code>s == nil      \/\/ \u2715\nlen(s) == 0   \/\/ \u25cb<\/code><\/pre><\/div>\n\n\n\n<ul>\n<li><span>append\u3057\u305f\u3089\u3001\u540c\u3058\u30b9\u30e9\u30a4\u30b9\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u306e\u304c\u666e\u901a\u3002<\/span><br><span>\uff08Gopher\u9053\u5834\u3067\u3082\u8a00\u3063\u3066\u305f\uff09<\/span><\/li>\n<\/ul>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism undefined-numbers lang-plane\" data-file=\"Go\"><code>\/\/ \u30b9\u30e9\u30a4\u30b9\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u30a4\u30e1\u30fc\u30b8\ntype IntSlice struct {\n  p *int\n  len, cap int\n}<\/code><\/pre><\/div>\n\n\n\n<h3>4.3 \u30de\u30c3\u30d7<\/h3>\n<ul>\n<li><span>Go\u306f\u578b\u306b\u5fdc\u3058\u3066\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u3092\u751f\u6210\u3059\u308b\u3002\uff08Java\u306e\u5834\u5408\u306f\u578b\u3092\u6307\u5b9a\u3057\u3066\u304b\u3089\u4f5c\u308b\uff09<\/span><\/li>\n<\/ul>\n<p>\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306e\u8a71\u306b\u306a\u308b\u3002<\/p>\n<ul>\n<li><span>N\u500b\u3042\u308b\u914d\u5217\u306b\u3001\u3042\u308b\u5024\u304c\u5165\u3063\u3066\u3044\u308b\u304b\u8abf\u3079\u308b\u305f\u3081\u306b\u4f55\u56de\u691c\u67fb\u3092\u3059\u308b\u304b\u3002<\/span><\/li>\n<li><span>\u5024\u304c\u30e9\u30f3\u30c0\u30e0\u9806\u306e\u5834\u5408\u2192O(N)<\/span><\/li>\n<li><span>\u5024\u304c\u30bd\u30fc\u30c8\u3055\u308c\u3066\u3044\u308b\u5834\u5408\u2192O(log2N)\u3001\u771f\u3093\u4e2d\u304b\u3089\u5de6\u53f3\u306b\u5411\u304b\u3063\u3066\u63a2\u3057\u59cb\u3081\u308b\u3002\uff08\u4e8c\u5206\u691c\u7d22\u6cd5\uff09<\/span><\/li>\n<li><span>O(1)\u306f\u3001\u691c\u7d22\u6642\u9593\u304c\u5e38\u306b\u4e00\u5b9a\u3002\u3069\u3046\u3084\u3063\u3066\u3044\u4e00\u5b9a\u306b\u3059\u308b\u304b\u3092\u5b9f\u73fe\u3059\u308b\u304b<\/span><br \/><span>\u2192\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u3067\u5b9f\u73fe<\/span><\/li>\n<li><span>hash % M \u2192\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306b\u3044\u308c\u308b\uff1f<\/span><\/li>\n<li><span>\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306b\u5165\u308c\u308b\u30bf\u30a4\u30df\u30f3\u30b0\u3067 index\u304c\u3076\u3064\u304b\u3063\u305f\u3068\u304d\u306f\u3001<\/span><br \/><span>\u96a3\u306b\u3044\u308c\u308b\uff08\u5358\u7d14\u306a\u65b9\u6cd5\uff09\u3002\u5b9f\u88c5\u306b\u3088\u3063\u3066\u3061\u304c\u3046\u3002<\/span><\/li>\n<li>%v\u3067Map\u3092\u8868\u793a\u3059\u308b\u3068\u304d\u306f\u3001\u73fe\u5728\u3067\u306f\u30e9\u30f3\u30c0\u30e0\u3067\u306f\u306a\u3044\u3002\u2193\u3053\u3061\u3089..<\/li>\n<li><span>Map\u3092fmt.Print\u3067\u51fa\u529b\u3059\u308b\u3068\u30ad\u30fc\u3067\u6607\u9806\u30bd\u30fc\u30c8\u3055\u308c\u3066\u51fa\u529b\u3055\u308c\u308b\u306e\u306fGo 1.12\u304b\u3089\u5c0e\u5165\u3055\u308c\u307e\u3057\u305f\u3002\uff08\u5ca9\u7530\u30d7\u30ed\uff09<\/span><\/li>\n<\/ul>\n<p><a href=\"https:\/\/golang.org\/doc\/go1.12#fmt\">https:\/\/golang.org\/doc\/go1.12#fmt<\/a><\/p>\n<ul>\n<li><span>\u30bd\u30fc\u30c8\u3055\u308c\u308b\u306e\u306f\u51fa\u529b\u7d50\u679c\uff08\u898b\u3048\u65b9\uff09\u3060\u3051\uff01\uff08\u5ca9\u7530\u30d7\u30ed\uff09<\/span><\/li>\n<li>range\u306f\u76f8\u5909\u308f\u3089\u305a\u30e9\u30f3\u30c0\u30e0\u3002<\/li>\n<li>\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306bValue\u3092\u6301\u305f\u305b\u305f\u306e\u304c\u30de\u30c3\u30d7<\/li>\n<li>\u30de\u30c3\u30d7\u304c\u5927\u304d\u304f\u306a\u308b\u969b\u306b\u65e2\u5b58\u306e\u8981\u7d20\u304c\u518d\u3073\u30cf\u30c3\u30b7\u30f3\u30b0\u3055\u308c\u3066\u65b0\u305f\u306a\u30e1\u30e2\u30ea\u4f4d\u7f6e\u3078\u79fb\u52d5\u3059\u308b\u3053\u3068\u304c\u3042\u308b\u3002\uff08key\u304b\u3089\u30cf\u30c3\u30b7\u30e5\u5024\u3092\u51fa\u3059\u2192\u30cf\u30c3\u30b7\u30e5\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3057\u3001\u30c7\u30fc\u30bf\u304c\u5165\u308a\u5207\u3089\u306a\u304f\u306a\u3063\u305f\u5834\u5408\u3068\u304b\uff09\u3002\u306a\u306e\u3067\u3001<span style=\"color: #ff0000;\">\u30de\u30c3\u30d7\u8981\u7d20\u306e\u30a2\u30c9\u30ec\u30b9\u306f\u5f97\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044<\/span>\u3002<\/li>\n<\/ul>\n<h2>\u8cea\u554f\uff06\u96d1\u8ac7\u30bf\u30a4\u30e0<\/h2>\n<ul>\n<li><span>len(s)\u306f\u3001\u5185\u90e8\u306eUTF-\uff18\u8868\u73fe\u306e\u30d0\u30a4\u30c8\u6570\u304c&#x1f438;\u3002\u6587\u5b57\u6570\u3058\u3083\u306a\u3044\u3002<\/span><\/li>\n<li><span>[]byte(s) \u306f\u3001\u5185\u90e8\u306eUTF-8\u8868\u73fe\u306e\u30d0\u30a4\u30c8\u914d\u5217\u3092\u30b3\u30d4\u30fc\u3057\u305f\u3082\u306e\u3092<\/span><span>\u57fa\u5e95\u914d\u5217\u3068\u3059\u308b\u30b9\u30e9\u30a4\u30b9\u3002<\/span><\/li>\n<li><span>[]urne(s) \u5185\u90e8\u306eUT-8\u306e\u5404\u6587\u5b57\u3092rune\u3078\u30c7\u30b3\u30fc\u30c9\u3057\u305f\u3082\u306e\u3092<\/span><span>\u57fa\u5e95\u914d\u5217\u3068\u3059\u308b\u30b9\u30e9\u30a4\u30b9\u3002<\/span><br \/><br \/><span>rune(uint32)\u306e\u914d\u5217<\/span><br \/><span>H E L L O \u25b3 \u4e16 \u754c<\/span><br \/><br \/><span>\u30de\u30eb\u30c1\u30d0\u30a4\u30c8\u306e\u6587\u5b57\u5217\u3092\u6570\u3048\u308b\u3002<\/span><br \/><span>utf8.RuneCountInString()<\/span><\/li>\n<li>\u30b8\u30a7\u30cd\u30ea\u30af\u30b9\u306b\u3064\u3044\u3066\u3051\u3063\u3053\u3046\u8a71\u3057\u3066\u3044\u305f\u3002\u67f4\u7530\u3055\u3093\u304c\u81ea\u5206\u3067\u4f5c\u3063\u3066\u308b\u3084\u3064\u3068\u304b\u8aac\u660e\u3057\u3066\u304f\u308c\u305f\uff08\u96e3\u3057\u304b\u3063\u305f\u3051\u3069\uff09<\/li>\n<\/ul>\n<p>\u67f4\u7530\u3055\u3093\u3082\u5ca9\u7530\u30d7\u30ed\u3082\u3001\u79c1\u306e\u3057\u3087\u30fc\u3082\u306a\u3044\u8cea\u554f\u306b\u7b54\u3048\u3066\u304f\u308c\u305f\u308a\u3067\u3001\u3068\u3066\u3082\u8cb4\u91cd\u306a\u304a\u6642\u9593\u3092\u3044\u305f\u3060\u3044\u305f\u306e\u3067\u3057\u305f\u3002<\/p>\n<p>\u307e\u305f\u6b21\u56de\u266a<\/p>\n","protected":false},"excerpt":{"rendered":"<p>const Pi 64 float64 = math.Pi var x float32 = float32(Pi64) var y float65 = Pi64 var z complex128 =  &#8230; <\/p>\n","protected":false},"author":1,"featured_media":4842,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[95],"tags":[],"class_list":["post-5069","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-golang"],"_links":{"self":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/5069"}],"collection":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=5069"}],"version-history":[{"count":9,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/5069\/revisions"}],"predecessor-version":[{"id":5078,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/posts\/5069\/revisions\/5078"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=\/wp\/v2\/media\/4842"}],"wp:attachment":[{"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=5069"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=5069"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/greentown.tokyo\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=5069"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}