{"id":41214,"date":"2026-03-11T09:23:01","date_gmt":"2026-03-11T09:23:01","guid":{"rendered":"https:\/\/www.railscarma.com\/?p=41214"},"modified":"2026-03-11T09:27:52","modified_gmt":"2026-03-11T09:27:52","slug":"ruby%e3%83%9e%e3%83%ab%e3%83%81%e3%83%a9%e3%82%a4%e3%83%b3%e6%96%87%e5%ad%97%e5%88%97%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e7%b7%8f%e5%90%88%e3%82%ac%e3%82%a4%e3%83%89","status":"publish","type":"post","link":"https:\/\/www.railscarma.com\/ja\/%e3%83%96%e3%83%ad%e3%82%b0\/ruby%e3%83%9e%e3%83%ab%e3%83%81%e3%83%a9%e3%82%a4%e3%83%b3%e6%96%87%e5%ad%97%e5%88%97%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e7%b7%8f%e5%90%88%e3%82%ac%e3%82%a4%e3%83%89\/","title":{"rendered":"Ruby\u3067\u591a\u884c\u6587\u5b57\u5217\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\uff1a\u5305\u62ec\u7684\u30ac\u30a4\u30c9"},"content":{"rendered":"
\n\t\t\t\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t\t
\n\t\t\t
\n\t\t\t\t\t\t
\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t

\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306e\u4e16\u754c\u3067\u306f\u3001\u6587\u5b57\u5217\u306f\u30c6\u30ad\u30b9\u30c8\u30c7\u30fc\u30bf\u3092\u6271\u3046\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u69cb\u6210\u8981\u7d20\u3067\u3059\u3002\u30a8\u30ec\u30ac\u30f3\u30c8\u306a\u69cb\u6587\u3068\u958b\u767a\u8005\u306b\u512a\u3057\u3044\u6a5f\u80fd\u3067\u77e5\u3089\u308c\u308bRuby\u3067\u306f\u3001\u6587\u5b57\u5217\u3092\u5f37\u529b\u306b\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u304a\u308a\u3001\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u7c21\u5358\u306b\u6271\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u958b\u767a\u8005\u306f1\u884c\u306e\u6587\u5b57\u5217\u3092\u9023\u7d50\u3057\u305f\u308a\u6539\u884c\u6587\u5b57\u3092\u624b\u52d5\u3067\u633f\u5165\u3057\u305f\u308a\u3059\u308b\u624b\u9593\u3092\u304b\u3051\u305a\u306b\u3001\u8907\u6570\u884c\u306b\u307e\u305f\u304c\u308b\u30c6\u30ad\u30b9\u30c8\u3092\u8868\u73fe\u3067\u304d\u307e\u3059\u3002\u3053\u306e\u6a5f\u80fd\u306f\u3001HTML\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u57cb\u3081\u8fbc\u307f\u3001SQL\u30af\u30a8\u30ea\u306e\u8a18\u8ff0\u3001\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u751f\u6210\u3001\u3042\u308b\u3044\u306f\u8a69\u7684\u306a\u30b3\u30fc\u30c9\u30fb\u30b9\u30cb\u30da\u30c3\u30c8\u306e\u4f5c\u6210\u3068\u3044\u3063\u305f\u5834\u9762\u3067\u7279\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/span><\/p>

Ruby\u3067\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u306f\u3001\u304d\u308c\u3044\u3067\u8aad\u307f\u3084\u3059\u304f\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u3092\u76ee\u6307\u3059\u958b\u767a\u8005\u306b\u3068\u3063\u3066\u4e0d\u53ef\u6b20\u3067\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u8907\u6570\u884c\u6587\u5b57\u5217\u3092\u4f5c\u6210\u30fb\u64cd\u4f5c\u3059\u308b\u305f\u3081\u306e\u69d8\u3005\u306a\u65b9\u6cd5\u3001\u305d\u306e\u5229\u70b9\u3001\u6f5c\u5728\u7684\u306a\u843d\u3068\u3057\u7a74\u3001\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u69cb\u6587\u304b\u3089\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3001\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u8c4a\u5bcc\u306a\u4f8b\u3067\u8aac\u660e\u3057\u307e\u3059\u3002\u6700\u5f8c\u306b\u306f\u3001\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u6587\u5b57\u5217\u3092\u6d3b\u7528\u3057\u3066Ruby\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3092\u5f37\u5316\u3059\u308b\u65b9\u6cd5\u3092\u5b8c\u5168\u306b\u628a\u63e1\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3067\u3057\u3087\u3046\u3002Ruby\u3092\u59cb\u3081\u305f\u3070\u304b\u308a\u306e\u521d\u5fc3\u8005\u306e\u65b9\u306b\u3082\u3001\u30b9\u30ad\u30eb\u3092\u78e8\u304d\u305f\u3044\u7d4c\u9a13\u8c4a\u5bcc\u306a\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u65b9\u306b\u3082\u3001\u3053\u306e\u30ac\u30a4\u30c9\u306f\u8cb4\u91cd\u306a\u6d1e\u5bdf\u3092\u4e0e\u3048\u3066\u304f\u308c\u308b\u3067\u3057\u3087\u3046\u3002.<\/span><\/p>

Ruby\u306e\u6587\u5b57\u5217\u51e6\u7406\u306f\u30d0\u30fc\u30b8\u30e7\u30f3\u3092\u91cd\u306d\u308b\u3054\u3068\u306b\u9032\u5316\u3057\u3001\u53ef\u8aad\u6027\u3068\u67d4\u8edf\u6027\u304c\u5411\u4e0a\u3057\u3066\u304d\u305f\u3002\u4f8b\u3048\u3070\u3001Ruby 2.3\u3067\u306f\u30b9\u30af\u30a4\u30b0\u30ea\u30fc\u30d8\u30ec\u30c9\u30c3\u30af\u304c\u5c0e\u5165\u3055\u308c\u3001\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u81ea\u52d5\u7684\u306b\u51e6\u7406\u3055\u308c\u308b\u3088\u3046\u306b\u306a\u308a\u3001\u30b3\u30fc\u30c9\u304c\u3055\u3089\u306b\u76f4\u611f\u7684\u306b\u306a\u3063\u305f\u3002Ruby\u306e\u6700\u65b0\u30ea\u30ea\u30fc\u30b9\uff08Ruby 3.3\u4ee5\u964d\u307e\u3067\uff09\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u6a5f\u80fd\u306f\u5f15\u304d\u7d9a\u304d\u8a00\u8a9e\u306e\u4e2d\u6838\u3068\u306a\u3063\u3066\u304a\u308a\u3001\u6539\u826f\u3092\u52a0\u3048\u306a\u304c\u3089\u5f8c\u65b9\u4e92\u63db\u6027\u3092\u78ba\u4fdd\u3057\u3066\u3044\u308b\u3002.<\/span><\/p>

Ruby\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u306e\u57fa\u672c<\/b><\/h3>

\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u6587\u5b57\u5217\u306b\u5165\u308b\u524d\u306b\u3001Ruby\u306b\u304a\u3051\u308b\u6587\u5b57\u5217\u306e\u57fa\u672c\u3092\u518d\u78ba\u8a8d\u3057\u3066\u304a\u304d\u307e\u3057\u3087\u3046\u3002\u6587\u5b57\u5217\u306f\u4e00\u91cd\u5f15\u7528\u7b26\uff08\u2018\uff09\u307e\u305f\u306f\u4e8c\u91cd\u5f15\u7528\u7b26\uff08\u201c\uff09\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u306e\u4e26\u3073\u3067\u3059\u3002\u4e00\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u5217\u306f\u30ea\u30c6\u30e9\u30eb\u3067\u3001\u300c\u2018\u300d\u3084\u300c\"\u300d\u4ee5\u5916\u306e\u30a8\u30b9\u30b1\u30fc\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\u306f\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u305b\u3093\u3002\u4e00\u65b9\u3001\u4e8c\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u5217\u306f\u3001#{expression}\u3092\u4f7f\u7528\u3057\u305f\u88dc\u9593\u304c\u53ef\u80fd\u3067\u3001\u6539\u884c\u306e\u305f\u3081\u306e\u02f6n\u3001\u30bf\u30d6\u306e\u305f\u3081\u306e\u02f6t\u3001Unicode\u6587\u5b57\u306e\u305f\u3081\u306e\u02f6u\u306e\u3088\u3046\u306a\u5e45\u5e83\u3044\u30a8\u30b9\u30b1\u30fc\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002.<\/span><\/p>

\u4f8b\u3048\u3070\uff1a<\/span><\/p>

\u30eb\u30d3\u30fc<\/span>
single = '\u30cf\u30ed\u30fc\u3001\u30ef\u30fc\u30eb\u30c9\uff01'<\/span>
double = \"\u3053\u3093\u306b\u3061\u306f\u3001#{\u540d\u524d}\uff01\"<\/span><\/pre>
\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u306f\u3053\u308c\u3089\u306e\u57fa\u790e\u306e\u4e0a\u306b\u6210\u308a\u7acb\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u3053\u306e\u533a\u5225\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3042\u308b\u3002\u30c6\u30ad\u30b9\u30c8\u304c\u8907\u6570\u884c\u306b\u307e\u305f\u304c\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u3001\u5358\u7d14\u306a\u5f15\u7528\u7b26\u3092\u4f7f\u3046\u306e\u306f\u9762\u5012\u306b\u306a\u308b\u3002\u30c6\u30ad\u30b9\u30c8\u306e\u6bb5\u843d\u3092\u66f8\u304f\u3053\u3068\u3092\u60f3\u50cf\u3057\u3066\u307f\u3066\u304f\u3060\u3055\u3044\u3002\u305d\u3053\u3067\u3001\u3088\u308a\u81ea\u7136\u306a\u65b9\u6cd5\u3067\u62e1\u5f35\u30c6\u30ad\u30b9\u30c8\u3092\u8868\u73fe\u3067\u304d\u308b\u30de\u30eb\u30c1\u884c\u69cb\u6587\u304c\u767b\u5834\u3057\u307e\u3059\u3002.<\/span><\/p>
Python\uff08\u4e09\u91cd\u5f15\u7528\u7b26\uff09\u3001JavaScript\uff08\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30fb\u30ea\u30c6\u30e9\u30eb\uff09\u3001Perl\uff08here documents\uff09\u306a\u3069\u591a\u304f\u306e\u8a00\u8a9e\u304c\u540c\u69d8\u306e\u6a5f\u80fd\u3092\u5099\u3048\u3066\u3044\u308b\u3002Python\uff08\u30c8\u30ea\u30d7\u30eb\u30af\u30a9\u30fc\u30c8\uff09\u3001JavaScript\uff08\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30ea\u30c6\u30e9\u30eb\uff09\u3001Perl\uff08\u3053\u3053\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\uff09\u306a\u3069\u591a\u304f\u306e\u8a00\u8a9e\u304c\u540c\u69d8\u306e\u6a5f\u80fd\u3092\u5099\u3048\u3066\u3044\u308b\u304c\u3001Ruby\u306e\u5b9f\u88c5\u306f\u3001\u305d\u306e\u6c4e\u7528\u6027\u3068\u8a00\u8a9e\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u6307\u5411\u6027\u3068\u306e\u7d71\u5408\u306e\u70b9\u3067\u969b\u7acb\u3063\u3066\u3044\u308b\u3002Ruby\u306e\u6587\u5b57\u5217\u306fString\u30af\u30e9\u30b9\u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3067\u3042\u308a\u3001gsub\u3001strip\u3001split\u3068\u3044\u3063\u305f\u30e1\u30bd\u30c3\u30c9\u3092\u7d99\u627f\u3057\u3066\u3044\u308b\u3002.<\/span><\/p>
\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u306e\u5b9a\u7fa9\uff1a\u7c21\u5358\u306a\u30a2\u30d7\u30ed\u30fc\u30c1<\/b><\/h3>
\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u4f5c\u6210\u3059\u308b\u6700\u3082\u7c21\u5358\u306a\u65b9\u6cd5\u306f\u3001\u4e8c\u91cd\u5f15\u7528\u7b26\u3092\u4f7f\u3044\u3001\u6539\u884c\u6587\u5b57\u3092\u660e\u793a\u7684\u306b\u57cb\u3081\u8fbc\u3080\u3053\u3068\u3067\u3042\u308b\u3002\u3053\u306e\u65b9\u6cd5\u306f\u7c21\u5358\u3060\u304c\u3001\u9577\u3044\u30c6\u30ad\u30b9\u30c8\u3067\u306f\u6271\u3044\u306b\u304f\u304f\u306a\u308b\u3002.<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
multiline = \"\u3053\u308c\u304c1\u884c\u76ee\u3067\u3059\u3002\" \"\u3053\u308c\u304c2\u884c\u76ee\u3067\u3059\u3002\" \"\u305d\u3057\u3066\u3053\u308c\u304c3\u884c\u76ee\u3067\u3059\u3002\"<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u3092\u7f6e\u304f<\/span><\/pre>
\u51fa\u529b\uff1a<\/strong>
<\/span>\u3053\u308c\u304c1\u884c\u76ee\u3060\u3002.
<\/span>\u3053\u308c\u304c2\u884c\u76ee\u3060\u3002.
<\/span>\u305d\u3057\u3066\u3053\u308c\u304c3\u884c\u76ee\u3060\u3002.<\/span><\/p>
\u52b9\u679c\u7684\u3067\u306f\u3042\u308b\u304c\u3001\u3053\u306e\u65b9\u6cd5\u3067\u306f\u6539\u884c\u3092\u624b\u52d5\u3067\u7ba1\u7406\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u66f8\u5f0f\u8a2d\u5b9a\u306b\u8aa4\u308a\u304c\u751f\u3058\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u3002\u5225\u306e\u65b9\u6cd5\u3068\u3057\u3066\u306f\u3001+\u6f14\u7b97\u5b50\u3084<<\uff08\u30b7\u30e3\u30d9\u30eb\u6f14\u7b97\u5b50\uff09\u3092\u4f7f\u3063\u305f\u6587\u5b57\u5217\u9023\u7d50\u304c\u3042\u308b\u304c\u3001\u3053\u308c\u306f\u53ef\u8aad\u6027\u306e\u4f4e\u3044\u30b3\u30fc\u30c9\u306b\u306a\u308b\u3053\u3068\u304c\u591a\u3044\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
multiline = \"\u3053\u308c\u306f1\u884c\u76ee\u3067\u3059\u3002<\/span>
 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"\u300c\u3053\u308c\u306f2\u884c\u76ee\u3067\u3059\u3002<\/span>
 \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"\u300c\u3053\u308c\u304c3\u884c\u76ee\u3060\"<\/span><\/pre>
\u3042\u308b\u3044\u306f\u3001\u6b21\u306b\u8aac\u660e\u3059\u308bheredocs\u3092\u4f7f\u3063\u3066\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u308b\u3002\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u65b9\u6cd5\u306f\u3001\u77ed\u3044\u8907\u6570\u884c\u306e\u30cb\u30fc\u30ba\u306b\u306f\u9069\u3057\u3066\u3044\u307e\u3059\u304c\u3001\u30a4\u30f3\u30c7\u30f3\u30c8\u3084\u5927\u304d\u306a\u30c6\u30ad\u30b9\u30c8\u30fb\u30d6\u30ed\u30c3\u30af\u3092\u542b\u3080\u8907\u96d1\u306a\u30b7\u30ca\u30ea\u30aa\u306b\u306f\u9069\u3057\u3066\u3044\u307e\u305b\u3093\u3002.<\/span><\/p>
\u30d8\u30ec\u30c9\u30c3\u30af\u30b9\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u30c6\u30ad\u30b9\u30c8\u306e\u30d1\u30ef\u30fc\u30cf\u30a6\u30b9<\/b><\/h3>
\u30d8\u30ec\u30c9\u30c3\u30af\u30b9<\/span><\/a> (\u300chere documents\u300d\u306e\u7565)\u306f\u3001\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u305f\u3081\u306eRuby\u306e\u4ee3\u8868\u7684\u306a\u30e1\u30ab\u30cb\u30ba\u30e0\u3067\u3042\u308b\u3002\u533a\u5207\u308a\u6587\u5b57\u3092\u6307\u5b9a\u3057\u3001\u305d\u306e\u533a\u5207\u308a\u6587\u5b57\u306b\u518d\u3073\u51fa\u4f1a\u3046\u307e\u3067\u81ea\u7531\u306b\u30c6\u30ad\u30b9\u30c8\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u69cb\u6587\u306f<<\u3067\u59cb\u307e\u308a\u3001\u305d\u306e\u5f8c\u306b\u533a\u5207\u308a\u6587\u5b57\uff08\u591a\u304f\u306e\u5834\u5408EOF\u3084END\u306e\u3088\u3046\u306b\u5927\u6587\u5b57\uff09\u304c\u7d9a\u304f\u3002.<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3 = <<EOF<\/span>
\u3053\u308c\u306f\u30d8\u30ec\u30c9\u30c3\u30af\u3060\u3002.<\/span>
\u8907\u6570\u306e\u30e9\u30a4\u30f3\u306b\u307e\u305f\u304c\u308b\u3053\u3068\u3082\u3042\u308b\u3002.<\/span>
<<EOF\uff08\u4e8c\u91cd\u5f15\u7528\u7b26\u30b9\u30bf\u30a4\u30eb\uff09\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u88dc\u9593\u306f\u6a5f\u80fd\u3059\u308b\u3002.<\/span>
2 + 2\u306e\u5024\u306f#{2 + 2}\u3067\u3042\u308b\u3002.<\/span>
\u3042\u3068\u304c\u304d<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u3092\u7f6e\u304f<\/span><\/pre>
\u51fa\u529b\uff1a
<\/strong>\u3053\u308c\u306f\u30d8\u30ec\u30c9\u30c3\u30af\u3060\u3002.
<\/span>\u8907\u6570\u306e\u30e9\u30a4\u30f3\u306b\u307e\u305f\u304c\u308b\u3053\u3068\u3082\u3042\u308b\u3002.
<\/span><<EOF\uff08\u4e8c\u91cd\u5f15\u7528\u7b26\u30b9\u30bf\u30a4\u30eb\uff09\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u3001\u88dc\u9593\u306f\u6a5f\u80fd\u3059\u308b\u3002.
<\/span>2 + 2\u306e\u5024\u306f4\u3067\u3042\u308b\u3002.<\/span><\/p>
Heredoc\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u3067\u306f\u4e8c\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u5217\u306e\u3088\u3046\u306b\u632f\u308b\u821e\u3044\u3001\u88dc\u9593\u3068\u30a8\u30b9\u30b1\u30fc\u30d7\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002\u4e00\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6319\u52d5\uff08\u88dc\u9593\u306a\u3057\uff09\u3092\u3059\u308b\u306b\u306f\u3001 <<\u2018EOF\u2019 \u307e\u305f\u306f <<-EOF \u3092\u30c7\u30ea\u30df\u30bf\u306b\u4e00\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u3093\u3067\u4f7f\u3046\u3002.<\/span><\/p>
\u91cd\u8981\u306a\u6a5f\u80fd\u306f\u3001\u7834\u7dda\u306e\u30d8\u30ec\u30c9\u30c3\u30af(<<-EOF)\u3092\u4f7f\u3048\u308b\u3053\u3068\u3067\u3001\u9589\u3058\u533a\u5207\u308a\u6587\u5b57\u3092\u30a4\u30f3\u30c7\u30f3\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3001\u30b3\u30fc\u30c9\u306e\u6574\u5217\u304c\u6539\u5584\u3055\u308c\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
def some_method<\/span>
 \u00a0<<-EOF<\/span>
 \u00a0\u00a0\u00a0\u30a4\u30f3\u30c7\u30f3\u30c8\u30fb\u30d8\u30ec\u30c9\u30c3\u30af\u3002.<\/span>
 \u00a0\u00a0\u00a0\u3053\u306e\u30af\u30ed\u30fc\u30baEOF\u306f\u30a4\u30f3\u30c7\u30f3\u30c8\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002.<\/span>
 \u00a0\u3042\u3068\u304c\u304d<\/span>
\u7d42\u308f\u308a<\/span><\/pre>
\u3053\u308c\u306f\u3001\u8aad\u307f\u3084\u3059\u3055\u306e\u305f\u3081\u306b\u30a4\u30f3\u30c7\u30f3\u30c8\u304c\u91cd\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3084\u30af\u30e9\u30b9\u3067\u7279\u306b\u6709\u7528\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001\u4f1d\u7d71\u7684\u306aheredoc\u306f\u6587\u5b57\u5217\u306e\u5148\u982d\u306b\u7a7a\u767d\u3092\u542b\u3080\u306e\u3067\u3001\u597d\u307e\u3057\u304f\u306a\u3044\u304b\u3082\u3057\u308c\u306a\u3044\u3002.<\/span><\/p>
\u30b9\u30af\u30a4\u30b0\u30ea\u30fc\u30fb\u30d8\u30ec\u30c9\u30c3\u30af\u30b9\u30e2\u30c0\u30f3\u306a\u30a4\u30f3\u30c7\u30f3\u30c8\u51e6\u7406<\/b><\/h3>
Ruby 2.3 \u3067\u5c0e\u5165\u3055\u308c\u305f\u30b9\u30af\u30a4\u30b0\u30ea\u30fc\u30d8\u30ec\u30c9\u30c3\u30af (<<~EOF) \u306f\u3001\u6700\u3082\u30a4\u30f3\u30c7\u30f3\u30c8\u3055\u308c\u3066\u3044\u306a\u3044\u884c\u3092\u57fa\u6e96\u306b\u5148\u982d\u306e\u7a7a\u767d\u3092\u81ea\u52d5\u7684\u306b\u53d6\u308a\u9664\u304f\u3053\u3068\u3067\u3001\u30a4\u30f3\u30c7\u30f3\u30c8\u306e\u554f\u984c\u306b\u5bfe\u51e6\u3057\u307e\u3059\u3002\u3053\u306e\u305f\u3081\u3001\u4f59\u5206\u306a\u51e6\u7406\u3092\u305b\u305a\u306b\u30b3\u30fc\u30c9\u30b9\u30cb\u30da\u30c3\u30c8\u3084 YAML\u3001JSON \u3092\u57cb\u3081\u8fbc\u3080\u306e\u306b\u7406\u60f3\u7684\u3067\u3059\u3002.<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3 = <<~EOF<\/span>
 \u00a0\u3053\u306e\u884c\u306b\u306f2\u3064\u306e\u30b9\u30da\u30fc\u30b9\u304c\u3042\u308b\u3002.<\/span>
 \u00a0\u00a0\u00a0\u3053\u308c\u306b\u306f4\u3064\u3042\u308b\u3002.<\/span>
 \u00a02\u4eba\u306b\u623b\u308b\u3002.<\/span>
\u3042\u3068\u304c\u304d<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3\u3092\u7f6e\u304f<\/span><\/pre>
\u51fa\u529b\uff1a
<\/strong>\u3053\u306e\u884c\u306b\u306f2\u3064\u306e\u30b9\u30da\u30fc\u30b9\u304c\u3042\u308b\u3002.
<\/span>\u00a0\u00a0\u3053\u308c\u306b\u306f4\u3064\u3042\u308b\u3002.
<\/span>2\u4eba\u306b\u623b\u308b\u3002.<\/span><\/p>
\u30b9\u30af\u30a4\u30b0\u30ea\u30fc\u6f14\u7b97\u5b50\uff08~\uff09\u306f\u3001\u6587\u5b57\u5217\u306e\u5148\u982d\u306e\u4e00\u822c\u7684\u306a\u7a7a\u767d\u3092\u9664\u53bb\u3057\u3001\u6587\u5b57\u5217\u3092\u78ba\u5b9f\u306b\u5206\u5272\u3059\u308b\u3002\u3053\u306e\u6a5f\u80fd\u306f\u3001\u958b\u767a\u8005\u304c\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u51e6\u7406\u3059\u308b\u65b9\u6cd5\u306b\u9769\u547d\u3092\u3082\u305f\u3089\u3057\u3001gsub(\/^ss+\/, \u201d)\u306e\u3088\u3046\u306a\u5f8c\u51e6\u7406\u30e1\u30bd\u30c3\u30c9\u306e\u5fc5\u8981\u6027\u3092\u6e1b\u3089\u3057\u305f\u3002.<\/span><\/p>
Squiggly heredocs\u306f\u307e\u3060\u88dc\u9593\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u304a\u308a\u3001\u52d5\u7684\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u591a\u7528\u9014\u306b\u4f7f\u3048\u307e\u3059\u3002\u4f8b\u3048\u3070\u3001Rails\u306e\u3088\u3046\u306a\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u3092\u4f7f\u3063\u305f\u30a6\u30a7\u30d6\u958b\u767a\u3067\u306f\u3001\u30e1\u30fc\u30eb\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u3084\u30d3\u30e5\u30fc\u30d1\u30fc\u30b7\u30e3\u30eb\u306b\u3088\u304f\u4f7f\u308f\u308c\u308b\u3002.<\/span><\/p>
\u30d1\u30fc\u30bb\u30f3\u30c8\u8868\u8a18\uff1a\u67d4\u8edf\u6027\u306e\u305f\u3081\u306e%Q\u3068%q<\/b><\/h3>
Ruby\u306b\u306f\u3001%Q{}\u3084%q[]\u306e\u3088\u3046\u306b\u3001\u30d1\u30fc\u30bb\u30f3\u30c8\u8868\u8a18\u3092\u4f7f\u3063\u3066\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u5b9a\u7fa9\u3059\u308b\u65b9\u6cd5\u3082\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3089\u306f\u4e8c\u91cd\u5f15\u7528\u7b26\u3084\u4e00\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u5217\u3068\u4f3c\u3066\u3044\u307e\u3059\u304c\u3001\u533a\u5207\u308a\u6587\u5b57\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u308b\u306e\u3067\u3001\u6587\u5b57\u5217\u306b\u5f15\u7528\u7b26\u3084\u305d\u306e\u4ed6\u306e\u7279\u6b8a\u6587\u5b57\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u306b\u4fbf\u5229\u3067\u3059\u3002.<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30de\u30eb\u30c1\u30e9\u30a4\u30f3 = %Q{<\/span>
\u3053\u308c\u306f\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3067\u3042\u308b\u3002.<\/span>
\u4e2d\u62ec\u5f27\u3092\u533a\u5207\u308a\u6587\u5b57\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u3002.<\/span>
\u88dc\u9593\uff1a#{Time.now}.<\/span>
}<\/span><\/pre>
\u533a\u5207\u308a\u6587\u5b57\u306b\u306f\u3001%Q|text|\u3084%Q[text]\u306e\u3088\u3046\u306a\u3001\u82f1\u6570\u5b57\u4ee5\u5916\u306e\u6587\u5b57\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u88dc\u9593\u3057\u306a\u3044\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f\u3001%q\u3092\u4f7f\u3046\u3002.<\/span><\/p>
\u3053\u306e\u8a18\u6cd5\u306f\u3001\u5f15\u7528\u7b26\u304c\u5165\u308c\u5b50\u306b\u306a\u3063\u3066\u3044\u308b\u6587\u5b57\u5217\u306e\u5834\u5408\u306b\u7279\u306b\u4fbf\u5229\u3067\u3042\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
html = %Q{<div class="container">\u3053\u3093\u306b\u3061\u306f\uff01<\/div>}<\/span><\/pre>
\u30d1\u30fc\u30bb\u30f3\u30c6\u30fc\u30b8\u8868\u8a18\u306f\u3001\u533a\u5207\u308a\u8a18\u53f7\u3092\u3088\u308a\u30b3\u30f3\u30c8\u30ed\u30fc\u30eb\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u3001heredocs\u306e\u4ee3\u66ff\u3068\u306a\u308b\u3002.<\/span><\/p>
\u88dc\u9593\u3068\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u30fb\u30b3\u30f3\u30c6\u30f3\u30c4<\/b><\/h3>
Ruby\u306e\u5f37\u307f\u306e\u4e00\u3064\u306f\u6587\u5b57\u5217\u306e\u88dc\u9593\u3067\u3001\u4e8c\u91cd\u5f15\u7528\u7b26\u3067\u56f2\u307e\u308c\u305f\u6587\u5b57\u5217\u3084\u540c\u7b49\u306e\u6587\u5b57\u5217\u306e\u4e2d\u306b\u5f0f\u3092\u30b7\u30fc\u30e0\u30ec\u30b9\u306b\u57cb\u3081\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u8907\u6570\u884c\u306e\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u306f\u3001\u3053\u308c\u306b\u3088\u3063\u3066\u5f37\u529b\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5316\u304c\u53ef\u80fd\u306b\u306a\u308b\u3002.<\/span><\/p>
\u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u306e\u751f\u6210\u3092\u691c\u8a0e\u3059\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
config = <<~CONFIG<\/span>
 \u00a0\u30b5\u30fc\u30d0\u3092\u6307\u5b9a\u3057\u307e\u3059\uff1a#{env['server_host']}\u3002<\/span>
 \u00a0\u30dd\u30fc\u30c8#{3000}<\/span>
 \u00a0\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304c\u3042\u308b\uff1a<\/span>
 \u00a0\u00a0\u00a0name: #{db_name}<\/span>
 \u00a0\u00a0\u00a0\u30e6\u30fc\u30b6#{db_user}\u3002<\/span>
\u30b3\u30f3\u30d5\u30a3\u30b0<\/span><\/pre>
\u3053\u306e\u30c0\u30a4\u30ca\u30df\u30c3\u30af\u306a\u6a5f\u80fd\u306f\u3001\u5909\u6570\u3084\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306b\u3088\u3063\u3066\u6587\u5b57\u5217\u3092\u5165\u529b\u3059\u308b\u30b9\u30af\u30ea\u30d7\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3044\u3066\u975e\u5e38\u306b\u6709\u7528\u3067\u3042\u308b\u3002\u3057\u304b\u3057\u3001\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u306e\u8106\u5f31\u6027\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u306b\u306f\u6ce8\u610f\u3057\u3066\u304f\u3060\u3055\u3044\u3002.<\/span><\/p>
\u3088\u308a\u8907\u96d1\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u5316\u306b\u3064\u3044\u3066\u306f\u3001Ruby\u306eERB\uff08Embedded Ruby\uff09\u30e9\u30a4\u30d6\u30e9\u30ea\u304c\u30b3\u30fc\u30c9\u3092\u57cb\u3081\u8fbc\u3093\u3060\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u51e6\u7406\u3067\u304d\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
require 'erb'
<\/span>
\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8 = <<~ERB<\/span>
 \u00a0\u3053\u3093\u306b\u3061\u306f\u3001\u3055\u3093\uff01<\/span>
 \u00a0\u3042\u306a\u305f\u306e\u30b9\u30b3\u30a2\u306f\u3067\u3059\u3002.<\/span>
\u30a4\u30fc\u30a2\u30fc\u30eb\u30d3\u30fc<\/span><\/pre>
\u00a0<\/p>
\u30ec\u30f3\u30c0\u30e9\u30fc = ERB.new(\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8)<\/span>
puts\u30ec\u30f3\u30c0\u30e9\u30fc.result(\u30d0\u30a4\u30f3\u30c7\u30a3\u30f3\u30b0)\u00a0 <\/span># \u540d\u524d\u3068\u30b9\u30b3\u30a2\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u3068\u3057\u3066<\/span><\/i><\/p>
\u3053\u308c\u306f\u3001\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3092\u3001\u30a6\u30a7\u30d6\u30a2\u30d7\u30ea\u3067\u4e00\u822c\u7684\u306a\u672c\u683c\u7684\u306a\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306b\u62e1\u5f35\u3059\u308b\u3002.<\/span><\/p>
\u5727\u75d5\u7ba1\u7406\u3068\u5265\u96e2\u6280\u8853<\/b><\/h3>
\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u3067\u30a4\u30f3\u30c7\u30f3\u30c8\u3092\u51e6\u7406\u3059\u308b\u306e\u306f\u3088\u304f\u3042\u308b\u8ab2\u984c\u3067\u3059\u3002\u30b9\u30af\u30a4\u30b0\u30ea\u30fcheredoc\u306e\u4ed6\u306b\u3001String#strip_heredoc\uff08Rails\u306e\u62e1\u5f35\u6a5f\u80fd\u3067\u3059\u304c\u3001\u7d14\u7c8b\u306aRuby\u3067\u3082\u5b9f\u88c5\u53ef\u80fd\uff09\u3084\u624b\u52d5\u30b9\u30c8\u30ea\u30c3\u30d4\u30f3\u30b0\u3092\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/span><\/p>
\u30ab\u30b9\u30bf\u30e0\u30fb\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30af\u30e9\u30b9\u6587\u5b57\u5217<\/span>
 \u00a0def strip_heredoc<\/span>
 \u00a0\u00a0\u00a0gsub(\/^<\/span>#{scan(\/^s*\/).min_by(&:length)}\/, '')<\/span><\/i>
 \u00a0\u7d42\u308f\u308a<\/span>
\u7d42\u308f\u308a<\/span><\/pre>
\u00a0<\/p>
multiline = <<~EOF.strip_heredoc<\/span>
 \u00a0\u30a4\u30f3\u30c7\u30f3\u30c8\u3055\u308c\u305f\u30c6\u30ad\u30b9\u30c8\u3002.<\/span>
 \u00a0\u00a0\u00a0\u3082\u3063\u3068\u5b57\u4e0b\u3052\u3092\u3002.<\/span>
 \u00a0\u5c11\u306a\u3044\u3002.<\/span>
\u3042\u3068\u304c\u304d<\/span><\/p>
\u3053\u308c\u306b\u3088\u308a\u3001\u304d\u308c\u3044\u306a\u51fa\u529b\u304c\u4fdd\u8a3c\u3055\u308c\u308b\u3002Ruby 3.0+\u3067\u306f\u3001String#strip\u306f\u5148\u982d\/\u672b\u5c3e\u306e\u6539\u884c\u3082\u524a\u9664\u3057\u307e\u3059\u304c\u3001\u30a4\u30f3\u30c7\u30f3\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u30ab\u30b9\u30bf\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u3084\u30b9\u30af\u30a4\u30b0\u30ea\u30fc\u30fb\u30d8\u30ec\u30c9\u30c3\u30af\u306e\u65b9\u304c\u826f\u3044\u3067\u3057\u3087\u3046\u3002.<\/span><\/p>
\u5b9f\u4e16\u754c\u3067\u306e\u4f7f\u7528\u4f8b<\/b><\/h3>
\u591a\u884c\u6587\u5b57\u5217\u306f\u3055\u307e\u3056\u307e\u306a\u9818\u57df\u3067\u8f1d\u304f\u3002\u30a6\u30a7\u30d6\u958b\u767a\u3067\u306f\u3001HTML\u30b9\u30cb\u30da\u30c3\u30c8\u306b\u4f7f\u308f\u308c\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
html = <<~HTML<\/span>
 \u00a0<html><\/span>
 \u00a0\u00a0\u00a0<body><\/span>
 \u00a0\u00a0\u00a0\u00a0\u00a0<p>\u3053\u3093\u306b\u3061\u306f\u3001\u4e16\u754c\u3088\uff01<\/p><\/span>
 \u00a0\u00a0\u00a0<\/body><\/span>
 \u00a0<\/html><\/span>
HTML<\/span><\/pre>
\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u306e\u3084\u308a\u53d6\u308a\u3067\u306f\u3001SQL\u30af\u30a8\u30ea\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30af\u30a8\u30ea\u30fc = <<~SQL<\/span>
 \u00a0SELECT * FROM users<\/span>
 \u00a0WHERE age > #{min_age}\u3002<\/span>
 \u00a0ORDER BY name\uff1b;<\/span>
SQL<\/span><\/pre>
SQL\u30a4\u30f3\u30b8\u30a7\u30af\u30b7\u30e7\u30f3\u306b\u6ce8\u610f\u3057\u3001\u4ee3\u308f\u308a\u306b\u30d7\u30ea\u30da\u30a2\u30c9\u30fb\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u3046\u3053\u3068\u3002.<\/span><\/p>
\u30b9\u30af\u30ea\u30d7\u30c6\u30a3\u30f3\u30b0\u3067\u306f\u3001\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u306b\u30b7\u30a7\u30eb\u30b3\u30de\u30f3\u30c9\u3084\u8a2d\u5b9a\u3092\u683c\u7d0d\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u30c6\u30b9\u30c8\u3067\u306f\u3001\u30e2\u30c3\u30af\u30c7\u30fc\u30bf\u3084\u671f\u5f85\u3055\u308c\u308b\u51fa\u529b\u306b\u6700\u9069\u3067\u3059\u3002.<\/span><\/p>
\u30b2\u30fc\u30e0\u958b\u767a\u3084\u30a2\u30b9\u30ad\u30fc\u30a2\u30fc\u30c8\u3067\u306f\u3001\u8907\u6570\u884c\u306e\u6587\u5b57\u5217\u306f\u66f8\u5f0f\u3092\u4fdd\u6301\u3059\u308b\uff1a<\/span><\/p>
\u30eb\u30d3\u30fc<\/span>
\u30a2\u30fc\u30c8 = <<~ART<\/span>
 \u00a0\/\\<\/span>
 \/\u00a0 \\<\/span>
\/____\\<\/span>
\u30a2\u30fc\u30c8<\/span><\/pre>
These examples highlight their practicality across Ruby ecosystems like Rails, Sinatra, or standalone scripts.<\/span><\/p>
Best Practices for Using Multiline Strings<\/b><\/h3>
To maximize effectiveness:<\/span><\/p>
  1. Choose the Right Method<\/b>: Use heredocs for long texts, percent notation for delimiter-heavy strings.<\/span><\/li>
  2. Prefer Squiggly Heredocs<\/b>: For Ruby 2.3+, they handle indentation automatically.<\/span><\/li>
  3. Avoid Excessive Interpolation<\/b>: For security and readability, limit dynamic parts.<\/span><\/li>
  4. Keep It Readable<\/b>: Align delimiters and use consistent styling.<\/span><\/li>
  5. Test Outputs<\/b>: Print or inspect multiline strings to verify formatting.<\/span><\/li>
  6. Use Encoding Wisely<\/b>: Specify encoding if dealing with non-ASCII, e.g., <<~EOF:UTF-8.<\/span><\/li><\/ol>
    Following these ensures clean code.<\/span><\/p>
    \u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3068\u305d\u306e\u907f\u3051\u65b9<\/b><\/h3>
    Pitfalls include:<\/span><\/p>