{"id":1297,"date":"2025-03-24T08:52:24","date_gmt":"2025-03-23T23:52:24","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1297"},"modified":"2025-03-24T08:52:24","modified_gmt":"2025-03-23T23:52:24","slug":"%e3%80%90ruby%e5%85%a5%e9%96%80%e3%80%91if%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a10%e5%80%8b%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%83%86%e3%82%af","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1297","title":{"rendered":"\u3010Ruby\u5165\u9580\u3011if\u306e\u4f7f\u3044\u65b9\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a10\u500b\u306e\u5b9f\u8df5\u7684\u30c6\u30af\u30cb\u30c3\u30af\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">Ruby\u306eif\u6587\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u6761\u4ef6\u5206\u5c90\u306e\u91cd\u8981\u6027<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">Ruby\u306eif\u6587\u306e\u57fa\u672c\u69cb\u6587\u3068\u7279\u5fb4<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">if\u6587\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u4e00\u884c\u3067\u66f8\u304fif\u6587\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046else\u30fbelsif\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">unless\u6587\u3068\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u7684\u306aif\u6587\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u7c21\u6f54\u306b\u66f8\u304f\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-9\">case\u6587\u3068\u306e\u4f7f\u3044\u5206\u3051\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u306eif\u6587\u6d3b\u7528\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">if\u6587\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">nil\u30fbfalse\u4ee5\u5916\u304c\u771f\u3068\u306a\u308b\u4ed5\u69d8\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-13\">\u6761\u4ef6\u5f0f\u306b\u304a\u3051\u308b==\u3068===\u306e\u9055\u3044<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">if\u6587\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">nil\u30fbfalse\u4ee5\u5916\u304c\u771f\u3068\u306a\u308b\u4ed5\u69d8\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-17\">\u6761\u4ef6\u5f0f\u306b\u304a\u3051\u308b==\u3068===\u306e\u9055\u3044<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">\u3088\u308a\u826f\u3044if\u6587\u3092\u66f8\u304f\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u6d3b\u7528<\/a>      <\/li>      <li>        <a href=\"#i-21\">\u30ac\u30fc\u30c9\u7bc0\u306b\u3088\u308b\u53ef\u8aad\u6027\u306e\u5411\u4e0a<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">Ruby\u3089\u3057\u3044\u6761\u4ef6\u5206\u5c90\u306e\u66f8\u304d\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-23\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3067\u5b66\u3076if\u6587<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-24\">\u30e6\u30fc\u30b6\u30fc\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-25\">\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6761\u4ef6\u5206\u5c90<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-26\">API\u30ec\u30b9\u30dd\u30f3\u30b9\u51e6\u7406\u3067\u306e\u4f7f\u7528\u4f8b<\/a>      <\/li>    <\/ul>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">Ruby\u306eif\u6587\u3068\u306f\uff1a\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u3067<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3051\u308b\u6761\u4ef6\u5206\u5c90\u306e\u91cd\u8981\u6027<\/h3>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u6761\u4ef6\u5206\u5c90\u306f\u3001\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u306e\u300c\u5224\u65ad\u529b\u300d\u3092\u5b9f\u73fe\u3059\u308b\u91cd\u8981\u306a\u8981\u7d20\u3067\u3059\u3002\u79c1\u305f\u3061\u306e\u65e5\u5e38\u751f\u6d3b\u3067\u306f\u300c\u3082\u3057\u96e8\u304c\u964d\u3063\u3066\u3044\u305f\u3089\u5098\u3092\u6301\u3063\u3066\u884c\u304f\u300d\u300c\u3082\u3057\u8ca1\u5e03\u3092\u5fd8\u308c\u305f\u3089\u53d6\u308a\u306b\u5e30\u308b\u300d\u3068\u3044\u3046\u3088\u3046\u306b\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u884c\u52d5\u3092\u5909\u3048\u3066\u3044\u307e\u3059\u3002\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u3082\u540c\u69d8\u306b\u3001\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u7570\u306a\u308b\u51e6\u7406\u3092\u5b9f\u884c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u3001\u3053\u308c\u3092\u5b9f\u73fe\u3059\u308b\u306e\u304c\u6761\u4ef6\u5206\u5c90\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u6761\u4ef6\u5206\u5c90\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e6\u30fc\u30b6\u30fc\u306e\u5165\u529b\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u5fdc\u7b54\u3092\u8fd4\u3059<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306e\u4f8b\u5916\u51e6\u7406\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306b\u57fa\u3065\u3044\u3066\u7570\u306a\u308b\u8a08\u7b97\u3092\u5b9f\u884c\u3059\u308b<\/li>\n\n\n\n<li>\u30b7\u30b9\u30c6\u30e0\u306e\u72b6\u614b\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u51e6\u7406\u3092\u9078\u629e\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">Ruby\u306eif\u6587\u306e\u57fa\u672c\u69cb\u6587\u3068\u7279\u5fb4<\/h3>\n\n\n\n<p>Ruby\u306eif\u6587\u306f\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u6bd4\u3079\u3066\u975e\u5e38\u306b\u67d4\u8edf\u3067\u8868\u73fe\u529b\u8c4a\u304b\u306a\u69cb\u6587\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002\u57fa\u672c\u7684\u306a\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">if \u6761\u4ef6\u5f0f\n  # \u6761\u4ef6\u304c\u771f\u306e\u5834\u5408\u306b\u5b9f\u884c\u3055\u308c\u308b\u51e6\u7406\nend\n\n# \u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\nage = 18\nif age &gt;= 18\n  puts \"\u6210\u4eba\u3067\u3059\"\nend<\/pre>\n\n\n\n<p>Ruby\u306eif\u6587\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7701\u7565\u53ef\u80fd\u306athen<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># then\u3092\u4f7f\u7528\u3057\u305f\u66f8\u304d\u65b9\nif age &gt;= 18 then puts \"\u6210\u4eba\u3067\u3059\" end\n\n# then\u3092\u7701\u7565\u3057\u305f\u66f8\u304d\u65b9\uff08\u63a8\u5968\uff09\nif age &gt;= 18; puts \"\u6210\u4eba\u3067\u3059\" end<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u4fee\u98fe\u5b50\u3068\u3057\u3066\u5f8c\u7f6e\u3067\u304d\u308b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">puts \"\u6210\u4eba\u3067\u3059\" if age &gt;= 18<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u5f0f\u3068\u3057\u3066\u306e\u8a55\u4fa1<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># if\u6587\u306e\u7d50\u679c\u3092\u5909\u6570\u306b\u4ee3\u5165\u3067\u304d\u308b\nstatus = if age &gt;= 18\n          \"\u6210\u4eba\"\n        else\n          \"\u672a\u6210\u5e74\"\n        end<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u8c4a\u5bcc\u306a\u6bd4\u8f03\u6f14\u7b97\u5b50<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u7b49\u5024\u6bd4\u8f03\nif name == \"Ruby\"  # \u5024\u306e\u6bd4\u8f03\nif name.eql? \"Ruby\"  # \u5024\u3068\u30af\u30e9\u30b9\u306e\u6bd4\u8f03\nif name.equal? other_name  # \u30aa\u30d6\u30b8\u30a7\u30af\u30c8ID\u306e\u6bd4\u8f03\n\n# \u5927\u5c0f\u6bd4\u8f03\nif age &gt;= 18\nif score &lt;= 100<\/pre>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li><strong>\u771f\u507d\u5024\u306e\u6271\u3044<\/strong><br>Ruby\u3067\u306f<code>false<\/code>\u3068<code>nil<\/code>\u4ee5\u5916\u306e\u3059\u3079\u3066\u306e\u5024\u304c\u771f\u3068\u3057\u3066\u6271\u308f\u308c\u307e\u3059\uff1a<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">if 1        # \u771f\u3068\u3057\u3066\u6271\u308f\u308c\u308b\nif \"false\"  # \u6587\u5b57\u5217\u306a\u306e\u3067\u771f\nif 0        # \u6570\u5024\u306a\u306e\u3067\u771f\nif nil      # \u507d\nif false    # \u507d<\/pre>\n\n\n\n<p>Ruby\u306eif\u6587\u306f\u3001\u3053\u306e\u3088\u3046\u306b\u67d4\u8edf\u306a\u69cb\u6587\u3068\u76f4\u611f\u7684\u306a\u771f\u507d\u5024\u306e\u6271\u3044\u306b\u3088\u308a\u3001\u8aad\u307f\u3084\u3059\u304f\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u57fa\u672c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90\u3082\u52b9\u679c\u7684\u306b\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u6a5f\u80fd\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3084\u5236\u5fa1\u30d5\u30ed\u30fc\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u3068\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">if\u6587\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u4e00\u884c\u3067\u66f8\u304fif\u6587\u306e\u6b63\u3057\u3044\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>Ruby\u3067\u306f\u3001if\u6587\u30921\u884c\u3067\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u4fbf\u5229\u306a\u69cb\u6587\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u306f\u7279\u306b\u7c21\u5358\u306a\u6761\u4ef6\u5206\u5c90\u3092\u8a18\u8ff0\u3059\u308b\u969b\u306b\u6709\u7528\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u9069\u5207\u306b\u4f7f\u7528\u3057\u306a\u3044\u3068\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u5f8c\u7f6eif\u6587\u306e\u57fa\u672c\u5f62\u5f0f<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u57fa\u672c\u7684\u306a\u5f62\u5f0f\n\u5b9f\u884c\u3057\u305f\u3044\u51e6\u7406 if \u6761\u4ef6\n\n# \u5177\u4f53\u4f8b\nputs \"\u304a\u306f\u3088\u3046\u3054\u3056\u3044\u307e\u3059\" if time &lt; 12\nreturn nil if user.nil?\nraise ArgumentError if amount.negative?<\/pre>\n\n\n\n<p>\u5f8c\u7f6eif\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u63a8\u5968\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e9\u671f\u30ea\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3067\u306e\u4f7f\u7528\ndef process_user(user)\n  return nil if user.nil?\n  # \u30e1\u30a4\u30f3\u306e\u51e6\u7406\nend\n\n# Bad: \u8907\u96d1\u306a\u51e6\u7406\u3067\u306e\u4f7f\u7528\ntotal = price * quantity if price &amp;&amp; quantity # \u907f\u3051\u308b\u3079\u304d<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u5358\u7d14\u306a\u51fa\u529b\u3084\u4ee3\u5165<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u30b7\u30f3\u30d7\u30eb\u306a\u51fa\u529b\nputs \"\u7ba1\u7406\u8005\u3067\u3059\" if user.admin?\n\n# Bad: \u8907\u6570\u306e\u51e6\u7406\nif user.admin? # \u3053\u306e\u5834\u5408\u306f\u901a\u5e38\u306eif\u6587\u3092\u4f7f\u7528\u3059\u3079\u304d\n  puts \"\u7ba1\u7406\u8005\u3067\u3059\"\n  grant_admin_privileges\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046else\u30fbelsif\u306e\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u6761\u4ef6\u5206\u5c90\u3092\u6271\u3046\u5834\u5408\u3001<code>else<\/code>\u3084<code>elsif<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u9069\u5207\u306b\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u660e\u78ba\u3067\u7ba1\u7406\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def check_temperature(temp)\n  if temp &gt;= 30\n    \"\u6691\u3044\u3067\u3059\"\n  elsif temp &gt;= 20\n    \"\u5feb\u9069\u3067\u3059\"\n  elsif temp &gt;= 10\n    \"\u6dbc\u3057\u3044\u3067\u3059\"\n  else\n    \"\u5bd2\u3044\u3067\u3059\"\n  end\nend<\/pre>\n\n\n\n<p><strong>elsif\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u306e\u9806\u5e8f\u3092\u9069\u5207\u306b\u8a2d\u5b9a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u5177\u4f53\u7684\u306a\u6761\u4ef6\u304b\u3089\u9806\u306b\u8a55\u4fa1\ndef determine_user_level(points)\n  if points &gt;= 1000\n    \"\u30d7\u30e9\u30c1\u30ca\"\n  elsif points &gt;= 500\n    \"\u30b4\u30fc\u30eb\u30c9\"\n  elsif points &gt;= 100\n    \"\u30b7\u30eb\u30d0\u30fc\"\n  else\n    \"\u30d6\u30ed\u30f3\u30ba\"\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u306e\u91cd\u8907\u3092\u907f\u3051\u308b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u6761\u4ef6\u304c\u91cd\u8907\u3057\u3066\u3044\u308b\nif age &gt;= 20\n  \"\u6210\u4eba\"\nelsif age &gt;= 18 &amp;&amp; age &lt; 20\n  \"\u65b0\u6210\u4eba\"\nelsif age &lt; 18\n  \"\u672a\u6210\u5e74\"\nend\n\n# Good: \u91cd\u8907\u3092\u6392\u9664\nif age &gt;= 20\n  \"\u6210\u4eba\"\nelsif age &gt;= 18\n  \"\u65b0\u6210\u4eba\"\nelse\n  \"\u672a\u6210\u5e74\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">unless\u6587\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p><code>unless<\/code>\u6587\u306f<code>if !\u6761\u4ef6<\/code>\u306e\u4ee3\u66ff\u3068\u3057\u3066\u4f7f\u7528\u3067\u304d\u308b Ruby \u306e\u7279\u5fb4\u7684\u306a\u69cb\u6587\u3067\u3059\u3002\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>unless\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># if\u6587\u3067\u306e\u5426\u5b9a\u6761\u4ef6\nif !user.active?\n  notify_inactive_user\nend\n\n# unless\u6587\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\nunless user.active?\n  notify_inactive_user\nend<\/pre>\n\n\n\n<p><strong>unless\u3092\u4f7f\u7528\u3059\u3079\u304d\u5834\u5408\u3068\u907f\u3051\u308b\u3079\u304d\u5834\u5408<\/strong><\/p>\n\n\n\n<p>\u4f7f\u7528\u63a8\u5968\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u30b7\u30f3\u30d7\u30eb\u306a\u5426\u5b9a\u6761\u4ef6\nreturn unless valid?\nputs \"\u6e96\u5099\u5b8c\u4e86\" unless loading?\nskip_process unless user.admin?<\/pre>\n\n\n\n<p>\u907f\u3051\u308b\u3079\u304d\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u8907\u96d1\u306a\u6761\u4ef6\nunless user.nil? || !user.active? || user.admin?\n  process_regular_user\nend\n\n# Good: \u4e0a\u8a18\u3092 if \u3067\u66f8\u304d\u76f4\u3057\u305f\u5834\u5408\nif user.present? &amp;&amp; user.active? &amp;&amp; !user.admin?\n  process_regular_user\nend\n\n# Bad: else\u53e5\u306e\u4f7f\u7528\nunless user.admin?\n  puts \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u3067\u3059\"\nelse\n  puts \"\u7ba1\u7406\u8005\u3067\u3059\"\nend\n\n# Good: \u4e0a\u8a18\u3092 if \u3067\u66f8\u304d\u76f4\u3057\u305f\u5834\u5408\nif user.admin?\n  puts \"\u7ba1\u7406\u8005\u3067\u3059\"\nelse\n  puts \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\u3067\u3059\"\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u57fa\u672c\u7684\u306a\u66f8\u304d\u65b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u6761\u4ef6\u5206\u5c90\u3092\u9078\u629e\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u3092\u6d3b\u304b\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u7684\u306aif\u6587\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u4e09\u9805\u6f14\u7b97\u5b50\u3067\u7c21\u6f54\u306b\u66f8\u304f\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f<code>if\u6587<\/code>\u3092\u3088\u308a\u7c21\u6f54\u306b\u66f8\u304f\u305f\u3081\u306e\u69cb\u6587\u3067\u3001\u7279\u306b\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90\u3067\u306e\u5024\u306e\u4ee3\u5165\u306b\u9069\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u69cb\u6587<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u7d50\u679c = \u6761\u4ef6 ? \u771f\u306e\u5834\u5408\u306e\u5024 : \u507d\u306e\u5834\u5408\u306e\u5024\n\n# \u5177\u4f53\u4f8b\nage = 20\nstatus = age &gt;= 18 ? \"\u6210\u4eba\" : \"\u672a\u6210\u5e74\"<\/pre>\n\n\n\n<p><strong>\u52b9\u679c\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u30b7\u30f3\u30d7\u30eb\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\nname = user.name.nil? ? \"\u30b2\u30b9\u30c8\" : user.name\n\n# Better: \u307c\u3063\u3061\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3068\u3055\u3089\u306b\u7c21\u6f54\nname = user.name || \"\u30b2\u30b9\u30c8\"<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u4ed8\u304d\u306e\u5024\u306e\u4ee3\u5165<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Good: \u5358\u7d14\u306a\u6761\u4ef6\u3067\u306e\u5024\u306e\u6c7a\u5b9a\nmessage = count &gt; 0 ? \"\u30c7\u30fc\u30bf\u3042\u308a\" : \"\u30c7\u30fc\u30bf\u306a\u3057\"\n\n# Bad: \u8907\u96d1\u306a\u6761\u4ef6\u3084\u51e6\u7406\uff08\u901a\u5e38\u306eif\u6587\u3092\u4f7f\u3046\u3079\u304d\uff09\nresult = value &gt; 100 ? \n  complex_calculation(value) : \n  another_complex_calculation(value)<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">case\u6587\u3068\u306e\u4f7f\u3044\u5206\u3051\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>if\u6587\u3068case\u6587\u306f\u72b6\u6cc1\u306b\u5fdc\u3058\u3066\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>if\u6587\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u6761\u4ef6\u304c\u72ec\u7acb\u3057\u3066\u3044\u308b\u5834\u5408\ndef validate_user(user)\n  if user.nil?\n    \"\u30e6\u30fc\u30b6\u30fc\u304c\u5b58\u5728\u3057\u307e\u305b\u3093\"\n  elsif !user.active?\n    \"\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u7121\u52b9\u3067\u3059\"\n  elsif user.suspended?\n    \"\u30a2\u30ab\u30a6\u30f3\u30c8\u304c\u505c\u6b62\u4e2d\u3067\u3059\"\n  else\n    \"\u6709\u52b9\u306a\u30e6\u30fc\u30b6\u30fc\u3067\u3059\"\n  end\nend<\/pre>\n\n\n\n<p><strong>case\u6587\u304c\u9069\u3057\u3066\u3044\u308b\u5834\u5408<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5358\u4e00\u306e\u5024\u3084\u5f0f\u306b\u5bfe\u3059\u308b\u8907\u6570\u306e\u6761\u4ef6\u5206\u5c90\ndef determine_grade(score)\n  case score\n  when 90..100\n    \"A\"\n  when 80..89\n    \"B\"\n  when 70..79\n    \"C\"\n  when 60..69\n    \"D\"\n  else\n    \"F\"\n  end\nend<\/pre>\n\n\n\n<p><strong>\u4f7f\u3044\u5206\u3051\u306e\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>if\u6587\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u6570\u306e\u7570\u306a\u308b\u6761\u4ef6\u3092\u8a55\u4fa1\u3059\u308b<\/li>\n\n\n\n<li>\u771f\u507d\u5024\u3067\u306e\u8a55\u4fa1<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u6761\u4ef6\u5f0f\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>case\u6587\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5358\u4e00\u306e\u5024\u3084\u5f0f\u3092\u8907\u6570\u306e\u30d1\u30bf\u30fc\u30f3\u3068\u6bd4\u8f03<\/li>\n\n\n\n<li>\u5024\u306e\u7bc4\u56f2\u3067\u306e\u8a55\u4fa1<\/li>\n\n\n\n<li>\u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u306eif\u6587\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>Ruby\u3067\u306fif\u6587\u304c\u5f0f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u3001\u6700\u5f8c\u306b\u8a55\u4fa1\u3055\u308c\u305f\u5f0f\u306e\u5024\u3092\u8fd4\u3059\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u308c\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u7c21\u6f54\u3067\u8868\u73fe\u529b\u8c4a\u304b\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def user_status(user)\n  if user.admin?\n    \"\u7ba1\u7406\u8005\"\n  elsif user.moderator?\n    \"\u30e2\u30c7\u30ec\u30fc\u30bf\u30fc\"\n  else\n    \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\"\n  end\nend\n\n# \u4e0a\u8a18\u306f\u4ee5\u4e0b\u306ereturn\u6587\u3092\u7701\u7565\u3067\u304d\u308b\ndef user_status(user)\n  return \"\u7ba1\u7406\u8005\" if user.admin?\n  return \"\u30e2\u30c7\u30ec\u30fc\u30bf\u30fc\" if user.moderator?\n  \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\"\nend<\/pre>\n\n\n\n<p><strong>\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u4ed8\u304d\u306e\u5024\u306e\u751f\u6210<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def calculate_discount(price, user)\n  if user.premium?\n    price * 0.8  # 20%\u5272\u5f15\n  elsif user.regular?\n    price * 0.9  # 10%\u5272\u5f15\n  else\n    price  # \u5272\u5f15\u306a\u3057\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u6761\u4ef6\u4ed8\u304d\u751f\u6210<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def create_notification(event)\n  if event.urgent?\n    EmailNotification.new(event)\n  elsif event.regular?\n    SlackNotification.new(event)\n  else\n    NullNotification.new\n  end\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def process_data(data)\n  if data.valid?\n    data\n      .transform_keys(&amp;:to_sym)\n      .reject { |_, v| v.nil? }\n      .transform_values(&amp;:to_s)\n  else\n    {}\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8868\u73fe\u529b\u8c4a\u304b\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044Ruby\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001if\u6587\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">if\u6587\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">nil\u30fbfalse\u4ee5\u5916\u304c\u771f\u3068\u306a\u308b\u4ed5\u69d8\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>Ruby\u306e\u771f\u507d\u5024\u8a55\u4fa1\u306f\u4ed6\u306e\u8a00\u8a9e\u3068\u6bd4\u3079\u3066\u30e6\u30cb\u30fc\u30af\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<code>false<\/code>\u3068<code>nil<\/code>\u4ee5\u5916\u306e\u3059\u3079\u3066\u306e\u5024\u304c\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\u4ed5\u69d8\u306f\u3001\u4fbf\u5229\u3067\u3042\u308b\u4e00\u65b9\u3067\u601d\u308f\u306c\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\u5024\u306e\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u4ee5\u4e0b\u306f\u3059\u3079\u3066\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\nif 0        # 0\u3082\u771f\n  puts \"0\u306f\u771f\u3067\u3059\"\nend\n\nif \"\"       # \u7a7a\u6587\u5b57\u5217\u3082\u771f\n  puts \"\u7a7a\u6587\u5b57\u5217\u306f\u771f\u3067\u3059\"\nend\n\nif []       # \u7a7a\u914d\u5217\u3082\u771f\n  puts \"\u7a7a\u914d\u5217\u306f\u771f\u3067\u3059\"\nend\n\nif {}       # \u7a7a\u30cf\u30c3\u30b7\u30e5\u3082\u771f\n  puts \"\u7a7a\u30cf\u30c3\u30b7\u30e5\u306f\u771f\u3067\u3059\"\nend<\/pre>\n\n\n\n<p><strong>\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3068\u5bfe\u7b56<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u610f\u56f3\u3057\u306a\u3044\u771f\u306e\u8a55\u4fa1<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u5909\u6570\u306e\u5b58\u5728\u78ba\u8a8d\u3068\u3057\u3066\u4f7f\u7528\nif user_name\n  process_user(user_name)\nend\n\n# Good: \u660e\u793a\u7684\u306a nil \u30c1\u30a7\u30c3\u30af\nif !user_name.nil?\n  process_user(user_name)\nend\n\n# Better: \u7a7a\u6587\u5b57\u5217\u3082\u8003\u616e\nif user_name&amp;.strip.present?\n  process_user(user_name)\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6570\u5024\u306e\u8a55\u4fa1<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: 0\u306e\u5224\u5b9a\u3092\u8aa4\u308b\u53ef\u80fd\u6027\ndef process_count(count)\n  if count  # 0\u3082\u771f\u3068\u306a\u308b\u305f\u3081\u3001\u610f\u56f3\u3057\u305f\u52d5\u4f5c\u306b\u306a\u3089\u306a\u3044\n    perform_operation\n  end\nend\n\n# Good: \u660e\u793a\u7684\u306a\u6bd4\u8f03\ndef process_count(count)\n  if count &gt; 0\n    perform_operation\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u6761\u4ef6\u5f0f\u306b\u304a\u3051\u308b==\u3068===\u306e\u9055\u3044<\/h3>\n\n\n\n<p>Ruby\u306b\u306f<code>==<\/code>\u3001<code>===<\/code>\u3001<code>eql?<\/code>\u3001<code>equal?<\/code>\u3068\u3044\u3046\u8907\u6570\u306e\u7b49\u5024\u6bd4\u8f03\u6f14\u7b97\u5b50\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u6bd4\u8f03\u3092\u884c\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u5404\u6f14\u7b97\u5b50\u306e\u7279\u5fb4\u3068\u4f7f\u7528\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># == : \u5024\u306e\u6bd4\u8f03\n1 == 1.0          # =&gt; true\n\"1\" == 1          # =&gt; false\n\n# === : \u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\uff08case\u6587\u3067\u4f7f\u7528\uff09\n(1..10) === 5     # =&gt; true\nString === \"test\" # =&gt; true\n\/\\d+\/ === \"123\"   # =&gt; true\n\n# eql? : \u5024\u3068\u30af\u30e9\u30b9\u306e\u6bd4\u8f03\n1.eql?(1.0)       # =&gt; false\uff081\u306fInteger\u30671.0\u306fFloat\uff09\n\n# equal? : \u30aa\u30d6\u30b8\u30a7\u30af\u30c8ID\u306e\u6bd4\u8f03\nstr1 = \"hello\"\nstr2 = \"hello\"\nstr1.equal?(str2) # =&gt; false\uff08\u7570\u306a\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09<\/pre>\n\n\n\n<p><strong>\u9069\u5207\u306a\u6f14\u7b97\u5b50\u306e\u9078\u629e<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u4e00\u822c\u7684\u306a\u5024\u306e\u6bd4\u8f03\u306b\u306f == \u3092\u4f7f\u7528\ndef check_status(status)\n  if status == :active\n    process_active_user\n  end\nend\n\n# \u30af\u30e9\u30b9\u306e\u5224\u5b9a\u306b\u306f === \u3092\u4f7f\u7528\ndef process_value(value)\n  case value\n  when String\n    process_string(value)\n  when Integer\n    process_number(value)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u306f\u53ef\u8aad\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u3001\u30d0\u30b0\u306e\u6e29\u5e8a\u3068\u306a\u308a\u3084\u3059\u3044\u305f\u3081\u3001\u3067\u304d\u308b\u3060\u3051\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30b9\u30c8\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e9\u671f\u30ea\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u30cd\u30b9\u30c8\u304c\u6df1\u3044\ndef process_user(user)\n  if user\n    if user.active?\n      if user.admin?\n        perform_admin_task\n      else\n        perform_user_task\n      end\n    else\n      handle_inactive_user\n    end\n  else\n    handle_nil_user\n  end\nend\n\n# Good: \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3067\u6574\u7406\ndef process_user(user)\n  return handle_nil_user unless user\n  return handle_inactive_user unless user.active?\n\n  if user.admin?\n    perform_admin_task\n  else\n    perform_user_task\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u306e\u7d50\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u8907\u6570\u306e\u30cd\u30b9\u30c8\ndef validate_input(value)\n  if value.is_a?(String)\n    if value.length &gt;= 3\n      if value.match?(\/^[A-Za-z]+$\/)\n        process_valid_input(value)\n      end\n    end\n  end\nend\n\n# Good: \u6761\u4ef6\u3092\u7d50\u5408\ndef validate_input(value)\n  if value.is_a?(String) &amp;&amp; \n     value.length &gt;= 3 &amp;&amp; \n     value.match?(\/^[A-Za-z]+$\/)\n    process_valid_input(value)\n  end\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30ac\u30fc\u30c9\u7bc0\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u6761\u4ef6\u306e\u30cd\u30b9\u30c8\ndef calculate_price(product, quantity)\n  if product\n    if quantity &gt; 0\n      if product.in_stock?(quantity)\n        product.price * quantity\n      end\n    end\n  end\nend\n\n# Good: \u30ac\u30fc\u30c9\u7bc0\u3067\u6574\u7406\ndef calculate_price(product, quantity)\n  return 0 unless product\n  return 0 unless quantity &gt; 0\n  return 0 unless product.in_stock?(quantity)\n\n  product.price * quantity\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u826f\u3044if\u6587\u3092\u66f8\u304f\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">if\u6587\u306b\u304a\u3051\u308b\u6ce8\u610f\u70b9\u3068\u843d\u3068\u3057\u7a74<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">nil\u30fbfalse\u4ee5\u5916\u304c\u771f\u3068\u306a\u308b\u4ed5\u69d8\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>Ruby\u306e\u771f\u507d\u5024\u8a55\u4fa1\u306f\u4ed6\u306e\u8a00\u8a9e\u3068\u6bd4\u3079\u3066\u30e6\u30cb\u30fc\u30af\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<code>false<\/code>\u3068<code>nil<\/code>\u4ee5\u5916\u306e\u3059\u3079\u3066\u306e\u5024\u304c\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\u4ed5\u69d8\u306f\u3001\u4fbf\u5229\u3067\u3042\u308b\u4e00\u65b9\u3067\u601d\u308f\u306c\u30d0\u30b0\u306e\u539f\u56e0\u306b\u306a\u308b\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\u5024\u306e\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u4ee5\u4e0b\u306f\u3059\u3079\u3066\u771f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\nif 0        # 0\u3082\u771f\n  puts \"0\u306f\u771f\u3067\u3059\"\nend\n\nif \"\"       # \u7a7a\u6587\u5b57\u5217\u3082\u771f\n  puts \"\u7a7a\u6587\u5b57\u5217\u306f\u771f\u3067\u3059\"\nend\n\nif []       # \u7a7a\u914d\u5217\u3082\u771f\n  puts \"\u7a7a\u914d\u5217\u306f\u771f\u3067\u3059\"\nend\n\nif {}       # \u7a7a\u30cf\u30c3\u30b7\u30e5\u3082\u771f\n  puts \"\u7a7a\u30cf\u30c3\u30b7\u30e5\u306f\u771f\u3067\u3059\"\nend<\/pre>\n\n\n\n<p><strong>\u3088\u304f\u3042\u308b\u843d\u3068\u3057\u7a74\u3068\u5bfe\u7b56<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u610f\u56f3\u3057\u306a\u3044\u771f\u306e\u8a55\u4fa1<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u5909\u6570\u306e\u5b58\u5728\u78ba\u8a8d\u3068\u3057\u3066\u4f7f\u7528\nif user_name\n  process_user(user_name)\nend\n\n# Good: \u660e\u793a\u7684\u306a nil \u30c1\u30a7\u30c3\u30af\nif !user_name.nil?\n  process_user(user_name)\nend\n\n# Better: \u7a7a\u6587\u5b57\u5217\u3082\u8003\u616e\nif user_name&amp;.strip.present?\n  process_user(user_name)\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6570\u5024\u306e\u8a55\u4fa1<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: 0\u306e\u5224\u5b9a\u3092\u8aa4\u308b\u53ef\u80fd\u6027\ndef process_count(count)\n  if count  # 0\u3082\u771f\u3068\u306a\u308b\u305f\u3081\u3001\u610f\u56f3\u3057\u305f\u52d5\u4f5c\u306b\u306a\u3089\u306a\u3044\n    perform_operation\n  end\nend\n\n# Good: \u660e\u793a\u7684\u306a\u6bd4\u8f03\ndef process_count(count)\n  if count &gt; 0\n    perform_operation\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u6761\u4ef6\u5f0f\u306b\u304a\u3051\u308b==\u3068===\u306e\u9055\u3044<\/h3>\n\n\n\n<p>Ruby\u306b\u306f<code>==<\/code>\u3001<code>===<\/code>\u3001<code>eql?<\/code>\u3001<code>equal?<\/code>\u3068\u3044\u3046\u8907\u6570\u306e\u7b49\u5024\u6bd4\u8f03\u6f14\u7b97\u5b50\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u7570\u306a\u308b\u6bd4\u8f03\u3092\u884c\u3044\u307e\u3059\u3002\u3053\u308c\u3089\u3092\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u5404\u6f14\u7b97\u5b50\u306e\u7279\u5fb4\u3068\u4f7f\u7528\u4f8b<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># == : \u5024\u306e\u6bd4\u8f03\n1 == 1.0          # =&gt; true\n\"1\" == 1          # =&gt; false\n\n# === : \u30d1\u30bf\u30fc\u30f3\u30de\u30c3\u30c1\u30f3\u30b0\uff08case\u6587\u3067\u4f7f\u7528\uff09\n(1..10) === 5     # =&gt; true\nString === \"test\" # =&gt; true\n\/\\d+\/ === \"123\"   # =&gt; true\n\n# eql? : \u5024\u3068\u30af\u30e9\u30b9\u306e\u6bd4\u8f03\n1.eql?(1.0)       # =&gt; false\uff081\u306fInteger\u30671.0\u306fFloat\uff09\n\n# equal? : \u30aa\u30d6\u30b8\u30a7\u30af\u30c8ID\u306e\u6bd4\u8f03\nstr1 = \"hello\"\nstr2 = \"hello\"\nstr1.equal?(str2) # =&gt; false\uff08\u7570\u306a\u308b\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\uff09<\/pre>\n\n\n\n<p><strong>\u9069\u5207\u306a\u6f14\u7b97\u5b50\u306e\u9078\u629e<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u4e00\u822c\u7684\u306a\u5024\u306e\u6bd4\u8f03\u306b\u306f == \u3092\u4f7f\u7528\ndef check_status(status)\n  if status == :active\n    process_active_user\n  end\nend\n\n# \u30af\u30e9\u30b9\u306e\u5224\u5b9a\u306b\u306f === \u3092\u4f7f\u7528\ndef process_value(value)\n  case value\n  when String\n    process_string(value)\n  when Integer\n    process_number(value)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u6761\u4ef6\u5206\u5c90\u306e\u30cd\u30b9\u30c8\u306f\u53ef\u8aad\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u3001\u30d0\u30b0\u306e\u6e29\u5e8a\u3068\u306a\u308a\u3084\u3059\u3044\u305f\u3081\u3001\u3067\u304d\u308b\u3060\u3051\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30cd\u30b9\u30c8\u3092\u6e1b\u3089\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u65e9\u671f\u30ea\u30bf\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u30cd\u30b9\u30c8\u304c\u6df1\u3044\ndef process_user(user)\n  if user\n    if user.active?\n      if user.admin?\n        perform_admin_task\n      else\n        perform_user_task\n      end\n    else\n      handle_inactive_user\n    end\n  else\n    handle_nil_user\n  end\nend\n\n# Good: \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3067\u6574\u7406\ndef process_user(user)\n  return handle_nil_user unless user\n  return handle_inactive_user unless user.active?\n\n  if user.admin?\n    perform_admin_task\n  else\n    perform_user_task\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u306e\u7d50\u5408<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u8907\u6570\u306e\u30cd\u30b9\u30c8\ndef validate_input(value)\n  if value.is_a?(String)\n    if value.length &gt;= 3\n      if value.match?(\/^[A-Za-z]+$\/)\n        process_valid_input(value)\n      end\n    end\n  end\nend\n\n# Good: \u6761\u4ef6\u3092\u7d50\u5408\ndef validate_input(value)\n  if value.is_a?(String) &amp;&amp; \n     value.length &gt;= 3 &amp;&amp; \n     value.match?(\/^[A-Za-z]+$\/)\n    process_valid_input(value)\n  end\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30ac\u30fc\u30c9\u7bc0\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u6761\u4ef6\u306e\u30cd\u30b9\u30c8\ndef calculate_price(product, quantity)\n  if product\n    if quantity &gt; 0\n      if product.in_stock?(quantity)\n        product.price * quantity\n      end\n    end\n  end\nend\n\n# Good: \u30ac\u30fc\u30c9\u7bc0\u3067\u6574\u7406\ndef calculate_price(product, quantity)\n  return 0 unless product\n  return 0 unless quantity &gt; 0\n  return 0 unless product.in_stock?(quantity)\n\n  product.price * quantity\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6ce8\u610f\u70b9\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u826f\u3044if\u6587\u3092\u66f8\u304f\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u3088\u308a\u826f\u3044if\u6587\u3092\u66f8\u304f\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u30d1\u30bf\u30fc\u30f3\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p>\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u7570\u5e38\u7cfb\u3084\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u3092\u5148\u306b\u51e6\u7406\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30a4\u30f3\u30ed\u30b8\u30c3\u30af\u306e\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u624b\u6cd5\u3067\u3059\u3002\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u826f\u304f\u306a\u308a\u3001\u4fdd\u5b88\u6027\u304c\u5411\u4e0a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u30cd\u30b9\u30c8\u304c\u6df1\u304f\u3001\u30e1\u30a4\u30f3\u30ed\u30b8\u30c3\u30af\u304c\u5206\u304b\u308a\u306b\u304f\u3044\ndef process_order(order)\n  if order.valid?\n    if order.items.any?\n      if order.user.can_purchase?\n        # \u30e1\u30a4\u30f3\u306e\u51e6\u7406\uff08\u30cd\u30b9\u30c8\u304c\u6df1\u3044\uff09\n        calculate_total(order)\n      else\n        raise NotAuthorizedError\n      end\n    else\n      raise EmptyOrderError\n    end\n  else\n    raise InvalidOrderError\n  end\nend\n\n# Good: \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u3067\u6574\u7406\ndef process_order(order)\n  raise InvalidOrderError unless order.valid?\n  raise EmptyOrderError if order.items.empty?\n  raise NotAuthorizedError unless order.user.can_purchase?\n\n  # \u30e1\u30a4\u30f3\u30ed\u30b8\u30c3\u30af\u304c\u898b\u3084\u3059\u3044\n  calculate_total(order)\nend<\/pre>\n\n\n\n<p><strong>\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u306e\u5fdc\u7528\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def update_user_profile(user, params)\n  return false unless user\n  return false unless params[:name].present?\n  return false if params[:email]&amp;.empty?\n\n  user.update(params)\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6a29\u9650\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def perform_admin_action(user, action)\n  return unauthorized_response unless user.admin?\n  return invalid_action_response unless valid_admin_action?(action)\n\n  execute_admin_action(user, action)\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30ac\u30fc\u30c9\u7bc0\u306b\u3088\u308b\u53ef\u8aad\u6027\u306e\u5411\u4e0a<\/h3>\n\n\n\n<p>\u30ac\u30fc\u30c9\u7bc0\u306f\u6761\u4ef6\u3092\u5426\u5b9a\u5f62\u3067\u66f8\u304d\u3001\u65e9\u671f\u306breturn\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30a4\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u898b\u3084\u3059\u304f\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\u3067\u3059\u3002<\/p>\n\n\n\n<p><strong>\u30ac\u30fc\u30c9\u7bc0\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u80af\u5b9a\u5f62\u306e\u6761\u4ef6\u3067\u30cd\u30b9\u30c8\u304c\u6df1\u304f\u306a\u308b\ndef send_notification(user)\n  if user.active?\n    if user.email.present?\n      if user.notification_enabled?\n        NotificationService.deliver(user)\n      end\n    end\n  end\nend\n\n# Good: \u30ac\u30fc\u30c9\u7bc0\u3067\u6574\u7406\ndef send_notification(user)\n  return unless user.active?\n  return unless user.email.present?\n  return unless user.notification_enabled?\n\n  NotificationService.deliver(user)\nend<\/pre>\n\n\n\n<p><strong>\u30ac\u30fc\u30c9\u7bc0\u306e\u6d3b\u7528\u4f8b<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def create_article(title:, content:, author:)\n  return Error.new('\u30bf\u30a4\u30c8\u30eb\u306f\u5fc5\u9808\u3067\u3059') if title.blank?\n  return Error.new('\u5185\u5bb9\u306f\u5fc5\u9808\u3067\u3059') if content.blank?\n  return Error.new('\u8457\u8005\u306f\u5fc5\u9808\u3067\u3059') if author.nil?\n\n  Article.create(\n    title: title,\n    content: content,\n    author: author\n  )\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u4ed8\u304d\u51e6\u7406<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def apply_discount(order)\n  return order.total unless order.eligible_for_discount?\n  return order.total unless Time.current.weekend?\n\n  order.total * 0.9  # 10%\u5272\u5f15\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">Ruby\u3089\u3057\u3044\u6761\u4ef6\u5206\u5c90\u306e\u66f8\u304d\u65b9<\/h3>\n\n\n\n<p>Ruby\u306b\u306f\u8a00\u8a9e\u7279\u6709\u306e\u6163\u7528\u53e5\u3084\u8868\u73fe\u65b9\u6cd5\u304c\u3042\u308a\u3001\u3053\u308c\u3089\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u7c21\u6f54\u3067\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>Ruby\u3089\u3057\u3044\u6761\u4ef6\u5206\u5c90\u306e\u4f8b<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u307c\u3063\u3061\u6f14\u7b97\u5b50\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u901a\u5e38\u306enil \u30c1\u30a7\u30c3\u30af\nif user &amp;&amp; user.profile &amp;&amp; user.profile.avatar\n  process_avatar(user.profile.avatar)\nend\n\n# Good: \u307c\u3063\u3061\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\nif user&amp;.profile&amp;.avatar\n  process_avatar(user.profile.avatar)\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30bd\u30c3\u30c9\u540d\u306e\u5de5\u592b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u771f\u507d\u5024\u3092\u78ba\u8a8d\u3059\u308b\u5197\u9577\u306a\u6761\u4ef6\nif user.admin == true\n  perform_admin_task\nend\n\n# Good: \u8ff0\u8a9e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\nif user.admin?\n  perform_admin_task\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># Bad: \u9577\u3055\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u6761\u4ef6\nif users.length &gt; 0\n  process_users(users)\nend\n\n# Good: \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\nif users.any?\n  process_users(users)\nend\n\n# Better: \u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30d6\u30ed\u30c3\u30af\u3082\u4f7f\u7528\nif users.any? { |user| user.active? }\n  process_active_users(users)\nend<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>\u6761\u4ef6\u4ed8\u304d\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u6d3b\u7528\u3057\u305f\u6761\u4ef6\u5206\u5c90\nresult = users\n  .select(&amp;:active?)\n  .reject(&amp;:admin?)\n  .map(&amp;:email)\n  .compact<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u8aad\u307f\u3084\u3059\u3044Ruby\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u77e5\u8b58\u3092\u6d3b\u304b\u3057\u305f\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3067\u5b66\u3076if\u6587<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u30e6\u30fc\u30b6\u30fc\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6d3b\u7528\u4f8b<\/h3>\n\n\n\n<p>\u30e6\u30fc\u30b6\u30fc\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u69d8\u3005\u306a\u6761\u4ef6\u30c1\u30a7\u30c3\u30af\u3068\u8a8d\u53ef\u51e6\u7406\u304c\u5fc5\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b9f\u8df5\u7684\u306a\u8a8d\u8a3c\u30b7\u30b9\u30c6\u30e0\u306e\u5b9f\u88c5\u4f8b\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class AuthenticationService\n  def authenticate(email:, password:)\n    # \u30ac\u30fc\u30c9\u7bc0\u3067\u30a8\u30e9\u30fc\u30b1\u30fc\u30b9\u3092\u65e9\u671f\u30ea\u30bf\u30fc\u30f3\n    return failure_response('\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044') if email.blank?\n    return failure_response('\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u5165\u529b\u3057\u3066\u304f\u3060\u3055\u3044') if password.blank?\n\n    user = User.find_by(email: email.downcase)\n    return failure_response('\u30e6\u30fc\u30b6\u30fc\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093') unless user\n\n    if user.authenticate(password)\n      if user.two_factor_enabled?\n        handle_two_factor_auth(user)\n      else\n        success_response(user)\n      end\n    else\n      failure_response('\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u6b63\u3057\u304f\u3042\u308a\u307e\u305b\u3093')\n    end\n  end\n\n  private\n\n  def handle_two_factor_auth(user)\n    if user.active_two_factor_token?\n      # \u65e2\u5b58\u306e\u30c8\u30fc\u30af\u30f3\u304c\u3042\u308b\u5834\u5408\u306f\u518d\u5229\u7528\n      send_two_factor_token(user)\n    else\n      # \u65b0\u3057\u3044\u30c8\u30fc\u30af\u30f3\u3092\u751f\u6210\n      token = user.generate_two_factor_token\n      send_two_factor_token(user, token)\n    end\n    two_factor_response(user)\n  end\n\n  def success_response(user)\n    {\n      success: true,\n      user: user,\n      token: generate_session_token(user)\n    }\n  end\n\n  def failure_response(message)\n    {\n      success: false,\n      error: message\n    }\n  end\n\n  def two_factor_response(user)\n    {\n      success: true,\n      requires_2fa: true,\n      user_id: user.id\n    }\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u6761\u4ef6\u5206\u5c90<\/h3>\n\n\n\n<p>\u5728\u5eab\u7ba1\u7406\u30b7\u30b9\u30c6\u30e0\u3067\u306f\u3001\u8907\u6570\u306e\u6761\u4ef6\u306b\u57fa\u3065\u3044\u3066\u5728\u5eab\u72b6\u614b\u3092\u7ba1\u7406\u3057\u3001\u9069\u5207\u306a\u51e6\u7406\u3092\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class InventoryManager\n  def process_order(product, quantity, user)\n    # \u5728\u5eab\u30c1\u30a7\u30c3\u30af\u3068\u6ce8\u6587\u51e6\u7406\u3092\u884c\u3046\u30b5\u30fc\u30d3\u30b9\n    inventory = product.inventory\n\n    begin\n      # \u5728\u5eab\u72b6\u614b\u306b\u57fa\u3065\u304f\u6761\u4ef6\u5206\u5c90\n      if inventory.out_of_stock?\n        notify_out_of_stock(product)\n        return :out_of_stock\n      end\n\n      if quantity &gt; inventory.available_quantity\n        if user.premium_member?\n          # \u30d7\u30ec\u30df\u30a2\u30e0\u4f1a\u54e1\u306e\u5834\u5408\u306f\u4e88\u7d04\u3092\u53d7\u3051\u4ed8\u3051\u308b\n          create_backorder(product, quantity, user)\n          return :backorder_created\n        else\n          return :insufficient_stock\n        end\n      end\n\n      # \u5728\u5eab\u306e\u7a2e\u985e\u306b\u3088\u308b\u6761\u4ef6\u5206\u5c90\n      case inventory.storage_type\n      when 'regular'\n        process_regular_stock(product, quantity)\n      when 'refrigerated'\n        process_refrigerated_stock(product, quantity)\n      when 'frozen'\n        process_frozen_stock(product, quantity)\n      else\n        raise InvalidStorageType\n      end\n\n      update_inventory(product, quantity)\n      :order_processed\n    rescue StandardError =&gt; e\n      notify_error(e)\n      :processing_error\n    end\n  end\n\n  private\n\n  def update_inventory(product, quantity)\n    inventory = product.inventory\n    return unless inventory\n\n    if inventory.quantity &lt;= inventory.reorder_point\n      NotificationService.notify_low_stock(product)\n    end\n\n    inventory.decrease(quantity)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-26\">API\u30ec\u30b9\u30dd\u30f3\u30b9\u51e6\u7406\u3067\u306e\u4f7f\u7528\u4f8b<\/h3>\n\n\n\n<p>API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u51e6\u7406\u3067\u306f\u3001\u69d8\u3005\u306a\u30b9\u30c6\u30fc\u30bf\u30b9\u30b3\u30fc\u30c9\u3084\u30a8\u30e9\u30fc\u72b6\u614b\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30ec\u30b9\u30dd\u30f3\u30b9\u3092\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ApiResponseHandler\n  def self.handle_response(response)\n    return handle_error(response) unless response.success?\n\n    case response.status\n    when 200, 201\n      process_successful_response(response)\n    when 204\n      { success: true, data: nil }\n    else\n      handle_unexpected_success(response)\n    end\n  rescue JSON::ParserError =&gt; e\n    handle_parse_error(e)\n  end\n\n  private\n\n  def self.process_successful_response(response)\n    data = JSON.parse(response.body)\n\n    # \u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u7a2e\u985e\u306b\u5fdc\u3058\u305f\u51e6\u7406\n    if data.key?('pagination')\n      handle_paginated_response(data)\n    elsif data.key?('batch_results')\n      handle_batch_response(data)\n    else\n      handle_single_response(data)\n    end\n  end\n\n  def self.handle_error(response)\n    error_response = {\n      success: false,\n      status: response.status,\n      error: parse_error_message(response)\n    }\n\n    # \u30a8\u30e9\u30fc\u7a2e\u5225\u306b\u3088\u308b\u8ffd\u52a0\u51e6\u7406\n    if response.status == 401\n      handle_unauthorized_error(error_response)\n    elsif response.status == 429\n      handle_rate_limit_error(error_response)\n    elsif response.status &gt;= 500\n      handle_server_error(error_response)\n    else\n      error_response\n    end\n  end\n\n  def self.handle_unauthorized_error(error_response)\n    if TokenRefresher.refresh_needed?\n      if TokenRefresher.refresh_token\n        error_response[:retry] = true\n      else\n        error_response[:logout] = true\n      end\n    end\n    error_response\n  end\n\n  def self.parse_error_message(response)\n    return 'No response body' if response.body.blank?\n\n    begin\n      error_data = JSON.parse(response.body)\n      error_data['message'] || error_data['error'] || '\u4e0d\u660e\u306a\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u307e\u3057\u305f'\n    rescue JSON::ParserError\n      '\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u89e3\u6790\u306b\u5931\u6557\u3057\u307e\u3057\u305f'\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u696d\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u72b6\u6cc1\u3092\u60f3\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u5404\u4f8b\u3067\u793a\u3057\u305f\u3088\u3046\u306b\u3001\u9069\u5207\u306a\u6761\u4ef6\u5206\u5c90\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u660e\u78ba\u304b\u3064\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3068\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3084\u7279\u6b8a\u306a\u30b1\u30fc\u30b9\u306e\u51e6\u7406\u306a\u3069\u3082\u3001if\u6587\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u9069\u5207\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-1297","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-ruby","7":"nothumb"},"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1297","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1297"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1297\/revisions"}],"predecessor-version":[{"id":1299,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1297\/revisions\/1299"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}