{"id":1552,"date":"2025-03-24T08:50:25","date_gmt":"2025-03-23T23:50:25","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1552"},"modified":"2025-03-24T08:50:25","modified_gmt":"2025-03-23T23:50:25","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby%e3%81%ae%e4%b8%89%e9%a0%85%e6%bc%94%e7%ae%97%e5%ad%90%e3%82%92%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e4%bd%bf%e3%81%84","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1552","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Ruby\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u4f7f\u3044\u65b9\u3068\uff17\u3064\u306e\u5b9f\u8df5\u30d1\u30bf\u30fc\u30f3"},"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\">\u4e09\u9805\u6f14\u7b97\u5b50\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">if\u6587\u3068\u306e\u9055\u3044\u304b\u3089\u30b7\u30f3\u30d7\u30eb\u306b\u7406\u89e3\u3059\u308b\u4e09\u9805\u6f14\u7b97\u306e\u672c\u8cea<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u69cb\u6587\u3092\u56f3\u89e3\u3067\u5fb9\u5e95\u89e3\u8aac<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">\u4e09\u9805\u6f14\u7b97\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u7406\u89e3\u3057\u3088\u3046<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u771f\u306e\u5834\u5408\u3068\u507d\u306e\u5834\u5408\u3067\u8fd4\u3059\u5024\u3092\u5927\u4e8b\u306b<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u5909\u6570\u3078\u306e\u4ee3\u5165\u3067\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u77e5\u3063\u3066\u304a\u304f\u3079\u304d7\u3064\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u3068\u308a\u3042\u3048\u305a\u5024\u306e\u8a2d\u5b9a\u3067\u77ed\u304f\u66f8\u304f<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u914d\u5217\u30fb\u30cf\u30c3\u30b7\u30e5\u306e\u8981\u7d20\u3092\u6761\u4ef6\u5206\u5272\u3067\u53d6\u5f97\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-10\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-11\">nil\u30ac\u30fc\u30c9\u4ee3\u308f\u308a\u3068\u3057\u3066\u306e\u4f7f\u7528\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-12\">\u30d5\u30e9\u30b0\u5909\u6570\u306e\u5207\u308a\u66ff\u3048\u3092\u30b9\u30de\u30fc\u30c8\u306b\u884c\u3046<\/a>      <\/li>      <li>        <a href=\"#i-13\">\u6761\u4ef6\u4ed8\u304d\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8868\u793a\u30921\u884c\u3067\u66f8\u304f<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-14\">ActiveRecord\u3067\u306e\u6d3b\u7528\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-15\">\u4e09\u9805\u6f14\u7b97\u5b50\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-16\">\u30cd\u30b9\u30c8\u306f\u907f\u3051\u308b\u3079\u304d\u7406\u7531\u3068\u4ee3\u66ff\u6848<\/a>      <\/li>      <li>        <a href=\"#i-17\">\u53ef\u8aad\u6027\u3092\u8003\u616e\u3057\u305f\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3068\u8003\u616e\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u3088\u304f\u3042\u308b\u8cea\u554f\u3068\u56de\u7b54<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-21\">\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">nil\u30c1\u30a7\u30c3\u30af\u3067\u306e\u6d3b\u7528\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-23\">\u307e\u3068\u3081\uff1a\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-24\">\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u304f\u3053\u3068\u3092\u5e38\u306b\u610f\u8b58\u3059\u308b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-25\">\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u53c2\u8003\u306b\u6d3b\u7528\u306e\u5e45\u3092\u5e83\u3052\u308b<\/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\">\u4e09\u9805\u6f14\u7b97\u5b50\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/h2>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u3001\u6761\u4ef6\u5206\u5c90\u30921\u884c\u3067\u66f8\u3051\u308b\u4fbf\u5229\u306a\u6f14\u7b97\u5b50\u3067\u3059\u3002\u300c\u6761\u4ef6 ? \u771f\u306e\u5834\u5408\u306e\u5024 : \u507d\u306e\u5834\u5408\u306e\u5024\u300d\u3068\u3044\u3046\u69cb\u6587\u3067\u3001\u6761\u4ef6\u306b\u3088\u3063\u3066\u8fd4\u3059\u5024\u3092\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">if\u6587\u3068\u306e\u9055\u3044\u304b\u3089\u30b7\u30f3\u30d7\u30eb\u306b\u7406\u89e3\u3059\u308b\u4e09\u9805\u6f14\u7b97\u306e\u672c\u8cea<\/h3>\n\n\n\n<p>\u901a\u5e38\u306eif\u6587\u306b\u3088\u308b\u6761\u4ef6\u5206\u5c90\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u66f8\u304d\u307e\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=\"\"># \u901a\u5e38\u306eif\u6587\nif age &gt;= 20\n  status = \"\u6210\u4eba\"\nelse\n  status = \"\u672a\u6210\u5e74\"\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3092\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u3068\u3001\u305f\u3063\u305f1\u884c\u3067\u66f8\u3051\u307e\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=\"\"># \u4e09\u9805\u6f14\u7b97\u5b50\nstatus = age &gt;= 20 ? \"\u6210\u4eba\" : \"\u672a\u6210\u5e74\"<\/pre>\n\n\n\n<p>\u3053\u306e\u6bd4\u8f03\u304b\u3089\u5206\u304b\u308b\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u672c\u8cea\u7684\u306a\u7279\u5fb4\u306f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7c21\u6f54\u6027<\/strong>: \u8907\u6570\u884c\u306e\u30b3\u30fc\u30c9\u30921\u884c\u306b\u96c6\u7d04<\/li>\n\n\n\n<li><strong>\u5f0f\u3068\u3057\u3066\u306e\u6027\u8cea<\/strong>: \u5024\u3092\u76f4\u63a5\u8fd4\u305b\u308b<\/li>\n\n\n\n<li><strong>\u4ee3\u5165\u3068\u306e\u76f8\u6027<\/strong>: \u5909\u6570\u3078\u306e\u4ee3\u5165\u304c\u30b9\u30e0\u30fc\u30ba<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u69cb\u6587\u3092\u56f3\u89e3\u3067\u5fb9\u5e95\u89e3\u8aac<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u4ee5\u4e0b\u306e3\u3064\u306e\u8981\u7d20\u3067\u69cb\u6210\u3055\u308c\u3066\u3044\u307e\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=\"\">\u6761\u4ef6\u5f0f ? \u771f\u306e\u5834\u5408\u306e\u5024 : \u507d\u306e\u5834\u5408\u306e\u5024<\/pre>\n\n\n<div id=\"id-93bff9cd-dc79-4d21-9718-cff93399f0dc\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8981\u7d20<\/th><th>\u8aac\u660e<\/th><th>\u4f8b<\/th><\/tr><\/thead><tbody><tr><td>\u6761\u4ef6\u5f0f<\/td><td>\u771f\u507d\u3092\u5224\u5b9a\u3059\u308b\u5f0f<\/td><td><code>age &gt;= 20<\/code><\/td><\/tr><tr><td>\u771f\u306e\u5834\u5408\u306e\u5024<\/td><td>\u6761\u4ef6\u304c<code>true<\/code>\u306e\u6642\u306b\u8fd4\u3059\u5024<\/td><td><code>\"\u6210\u4eba\"<\/code><\/td><\/tr><tr><td>\u507d\u306e\u5834\u5408\u306e\u5024<\/td><td>\u6761\u4ef6\u304c<code>false<\/code>\u306e\u6642\u306b\u8fd4\u3059\u5024<\/td><td><code>\"\u672a\u6210\u5e74\"<\/code><\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u5b9f\u969b\u306e\u52d5\u4f5c\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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=\"\"># \u6761\u4ef6\u304ctrue\u306e\u5834\u5408\nscore = 85\nresult = score &gt;= 80 ? \"\u5408\u683c\" : \"\u4e0d\u5408\u683c\"\nputs result  # =&gt; \"\u5408\u683c\"\n\n# \u6761\u4ef6\u304cfalse\u306e\u5834\u5408\nscore = 75\nresult = score &gt;= 80 ? \"\u5408\u683c\" : \"\u4e0d\u5408\u683c\"\nputs result  # =&gt; \"\u4e0d\u5408\u683c\"<\/pre>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3046\u969b\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6761\u4ef6\u5f0f\u306f\u5fc5\u305a\u771f\u507d\u5024\uff08<code>true<\/code>\u307e\u305f\u306f<code>false<\/code>\uff09\u3092\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308b<\/li>\n\n\n\n<li>\u30b3\u30ed\u30f3\uff08<code>:<\/code>\uff09\u306e\u524d\u5f8c\u306b\u306f\u305d\u308c\u305e\u308c\u5024\u304c\u5fc5\u8981<\/li>\n\n\n\n<li>\u4e21\u65b9\u306e\u5024\u306f\u540c\u3058\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u3067\u4f7f\u7528\u53ef\u80fd\u306a\u578b\u3067\u3042\u308b\u5fc5\u8981\u304c\u3042\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u6761\u4ef6\u5206\u5c90\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u8868\u73fe\u3067\u304d\u308b\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5177\u4f53\u7684\u306a\u4f7f\u3044\u65b9\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">\u4e09\u9805\u6f14\u7b97\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u3057\u3063\u304b\u308a\u3068\u7406\u89e3\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u4f8b\u3092\u901a\u3058\u3066\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u771f\u306e\u5834\u5408\u3068\u507d\u306e\u5834\u5408\u3067\u8fd4\u3059\u5024\u3092\u5927\u4e8b\u306b<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u969b\u306f\u3001\u6761\u4ef6\u304c\u771f\u306e\u5834\u5408\u3068\u507d\u306e\u5834\u5408\u3067\u9069\u5207\u306a\u5024\u3092\u8fd4\u3059\u3053\u3068\u304c\u91cd\u8981\u3067\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=\"\"># \u6570\u5024\u3092\u8fd4\u3059\u4f8b\nage = 25\ndiscount = age &gt;= 60 ? 500 : 0\nputs discount  # =&gt; 0\n\n# \u6587\u5b57\u5217\u3092\u8fd4\u3059\u4f8b\ntemperature = 28\nweather = temperature &gt; 30 ? \"\u3068\u3066\u3082\u6691\u3044\" : \"\u5feb\u9069\"\nputs weather  # =&gt; \"\u5feb\u9069\"\n\n# \u771f\u507d\u5024\u3092\u8fd4\u3059\u4f8b\nstock = 0\navailable = stock &gt; 0 ? true : false\nputs available  # =&gt; false<\/pre>\n\n\n\n<p>\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8fd4\u3059\u5024\u306e\u578b\u306f\u4e00\u8cab\u3057\u3066\u3044\u308b\u3053\u3068<\/li>\n\n\n\n<li>\u6761\u4ef6\u306f\u660e\u78ba\u3067\u7406\u89e3\u3057\u3084\u3059\u3044\u3082\u306e\u306b\u3059\u308b\u3053\u3068<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u306f\u907f\u3051\u3001\u30b7\u30f3\u30d7\u30eb\u306a\u5024\u306e\u9078\u629e\u306b\u4f7f\u3046\u3053\u3068<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u5909\u6570\u3078\u306e\u4ee3\u5165\u3067\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u5909\u6570\u3078\u306e\u4ee3\u5165\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3068\u7279\u306b\u52b9\u679c\u7684\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=\"\"># \u30e6\u30fc\u30b6\u30fc\u306e\u6a29\u9650\u30ec\u30d9\u30eb\u3092\u8a2d\u5b9a\nuser_type = \"admin\"\naccess_level = user_type == \"admin\" ? 3 : 1\n\n# \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\nconfig = nil\nsettings = config ? config : \"default_settings\"\n\n# \u6570\u5024\u306e\u7bc4\u56f2\u30c1\u30a7\u30c3\u30af\u3068\u5024\u306e\u8a2d\u5b9a\nscore = 85\ngrade = score &gt;= 90 ? \"A\" : \n        score &gt;= 80 ? \"B\" : \n        score &gt;= 70 ? \"C\" : \"D\"<\/pre>\n\n\n\n<p>\u4ee3\u5165\u6642\u306e\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u521d\u671f\u5024\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u6761\u4ef6\u306b\u3088\u308b\u5024\u306e\u632f\u308a\u5206\u3051<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u4f7f\u7528\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092\u6c7a\u5b9a\u3059\u308b\u969b\u306b\u3082\u975e\u5e38\u306b\u4fbf\u5229\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=\"\"># \u5e74\u9f62\u306b\u3088\u308b\u6599\u91d1\u8a08\u7b97\u30e1\u30bd\u30c3\u30c9\ndef calculate_fee(age)\n  age &lt; 12 ? 500 : 1000\nend\n\n# \u5728\u5eab\u72b6\u6cc1\u30c1\u30a7\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\ndef stock_status(quantity)\n  quantity &gt; 0 ? \"\u5728\u5eab\u3042\u308a\" : \"\u5728\u5eab\u5207\u308c\"\nend\n\n# \u914d\u5217\u306e\u8981\u7d20\u30c1\u30a7\u30c3\u30af\u30e1\u30bd\u30c3\u30c9\ndef array_status(arr)\n  arr.empty? ? \"\u7a7a\u306e\u914d\u5217\u3067\u3059\" : \"\u8981\u7d20\u304c\u5b58\u5728\u3057\u307e\u3059\"\nend\n\n# \u4f7f\u7528\u4f8b\nputs calculate_fee(10)    # =&gt; 500\nputs stock_status(0)      # =&gt; \"\u5728\u5eab\u5207\u308c\"\nputs array_status([1,2])  # =&gt; \"\u8981\u7d20\u304c\u5b58\u5728\u3057\u307e\u3059\"<\/pre>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u3067\u306e\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u623b\u308a\u5024\u306e\u578b\u3092\u7d71\u4e00\u3059\u308b<\/li>\n\n\n\n<li>\u6761\u4ef6\u306f\u660e\u78ba\u306b\u3059\u308b<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u6761\u4ef6\u306f\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u540d\u304b\u3089\u671f\u5f85\u3055\u308c\u308b\u623b\u308a\u5024\u3068\u4e00\u81f4\u3055\u305b\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u5909\u6570\u3078\u306e\u4ee3\u5165\u3084\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306a\u3069\u3001\u69d8\u3005\u306a\u5834\u9762\u3067\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u77e5\u3063\u3066\u304a\u304f\u3079\u304d7\u3064\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<p>\u5b9f\u52d9\u3067\u6d3b\u7528\u3067\u304d\u308b\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u3092\u3088\u308a\u7c21\u6f54\u3067\u8aad\u307f\u3084\u3059\u3044\u3082\u306e\u306b\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u3068\u308a\u3042\u3048\u305a\u5024\u306e\u8a2d\u5b9a\u3067\u77ed\u304f\u66f8\u304f<\/h3>\n\n\n\n<p>\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u6761\u4ef6\u306b\u5fdc\u3058\u305f\u5024\u306e\u8a2d\u5b9a\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=\"\"># \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\noptions = provided_options ? provided_options : {}\n\n# \u74b0\u5883\u5909\u6570\u306e\u53d6\u5f97\nenvironment = ENV['RAILS_ENV'] ? ENV['RAILS_ENV'] : 'development'\n\n# \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u5024\u306e\u8a2d\u5b9a\ntimeout = config[:timeout] ? config[:timeout] : 30<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u914d\u5217\u30fb\u30cf\u30c3\u30b7\u30e5\u306e\u8981\u7d20\u3092\u6761\u4ef6\u5206\u5272\u3067\u53d6\u5f97\u3059\u308b<\/h3>\n\n\n\n<p>\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306e\u8981\u7d20\u3092\u5b89\u5168\u306b\u53d6\u5f97\u3059\u308b\u969b\u306b\u4fbf\u5229\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=\"\"># \u914d\u5217\u306e\u8981\u7d20\u3092\u5b89\u5168\u306b\u53d6\u5f97\ndef safe_get(array, index)\n  array.length &gt; index ? array[index] : nil\nend\n\n# \u30cf\u30c3\u30b7\u30e5\u306e\u6df1\u3044\u30cd\u30b9\u30c8\u304b\u3089\u5024\u3092\u53d6\u5f97\ndef get_nested_value(hash, key1, key2)\n  hash[key1] ? hash[key1][key2] : nil\nend\n\n# \u4f7f\u7528\u4f8b\nnumbers = [1, 2, 3]\nputs safe_get(numbers, 5)  # =&gt; nil\n\nuser_data = { profile: { name: \"John\" } }\nputs get_nested_value(user_data, :profile, :name)  # =&gt; \"John\"<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u6d3b\u7528\u6cd5<\/h3>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u6d17\u7df4\u3055\u308c\u305f\u51e6\u7406\u3092\u66f8\u3051\u307e\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=\"\"># \u6587\u5b57\u5217\u306e\u51e6\u7406\ndef process_text(text)\n  text.nil? ? \"\" : text.strip.downcase\nend\n\n# \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\ndef get_user_name(user)\n  user.respond_to?(:name) ? user.name.titleize : \"Unknown User\"\nend\n\n# \u914d\u5217\u306e\u51e6\u7406\ndef format_items(items)\n  items.empty? ? \"No items\" : items.join(\", \")\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">nil\u30ac\u30fc\u30c9\u4ee3\u308f\u308a\u3068\u3057\u3066\u306e\u4f7f\u7528\u6cd5<\/h3>\n\n\n\n<p><code>nil<\/code>\u30c1\u30a7\u30c3\u30af\u3092\u7c21\u6f54\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\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=\"\"># nil\u30ac\u30fc\u30c9\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\nvalue = potentially_nil_value ? potentially_nil_value : \"default\"\n\n# \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\ndef get_display_name(user)\n  user&amp;.name ? user.name : \"Guest\"\nend\n\n# \u914d\u5217\u306e\u8981\u7d20\u30c1\u30a7\u30c3\u30af\ndef first_item(array)\n  array&amp;.first ? array.first : \"Empty\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u30d5\u30e9\u30b0\u5909\u6570\u306e\u5207\u308a\u66ff\u3048\u3092\u30b9\u30de\u30fc\u30c8\u306b\u884c\u3046<\/h3>\n\n\n\n<p>\u771f\u507d\u5024\u306e\u5207\u308a\u66ff\u3048\u3092\u7c21\u6f54\u306b\u66f8\u3051\u307e\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=\"\"># \u30d5\u30e9\u30b0\u306e\u53cd\u8ee2\nflag = true\nflag = flag ? false : true\n\n# \u6761\u4ef6\u306b\u57fa\u3065\u304f\u30d5\u30e9\u30b0\u8a2d\u5b9a\ndef is_valid?(count)\n  count.positive? ? true : false\nend\n\n# \u8907\u6570\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\ndef can_proceed?(status, count)\n  status == \"active\" &amp;&amp; count &gt; 0 ? true : false\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u6761\u4ef6\u4ed8\u304d\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u8868\u793a\u30921\u884c\u3067\u66f8\u304f<\/h3>\n\n\n\n<p>\u30e6\u30fc\u30b6\u30fc\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u95a2\u9023\u306e\u6761\u4ef6\u4ed8\u304d\u30e1\u30c3\u30bb\u30fc\u30b8\u8868\u793a\u306b\u4fbf\u5229\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=\"\"># \u30b9\u30c6\u30fc\u30bf\u30b9\u30e1\u30c3\u30bb\u30fc\u30b8\ndef status_message(count)\n  count &gt; 0 ? \"#{count}\u4ef6\u306e\u5546\u54c1\u304c\u3042\u308a\u307e\u3059\" : \"\u5546\u54c1\u304c\u3042\u308a\u307e\u305b\u3093\"\nend\n\n# \u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\ndef error_message(error_code)\n  error_code ? \"\u30a8\u30e9\u30fc: #{error_code}\" : \"\u6b63\u5e38\u306b\u51e6\u7406\u3055\u308c\u307e\u3057\u305f\"\nend\n\n# \u8b66\u544a\u30e1\u30c3\u30bb\u30fc\u30b8\ndef warning_message(level)\n  level &gt; 3 ? \"\u8b66\u544a: \u5371\u967a\u306a\u72b6\u614b\u3067\u3059\" : \"\u6b63\u5e38\u7bc4\u56f2\u5185\u3067\u3059\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">ActiveRecord\u3067\u306e\u6d3b\u7528\u4f8b<\/h3>\n\n\n\n<p>Rails\/ActiveRecord\u3067\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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=\"\">class User &lt; ApplicationRecord\n  # \u8868\u793a\u540d\u306e\u53d6\u5f97\n  def display_name\n    nickname ? nickname : email\n  end\n\n  # \u7ba1\u7406\u8005\u6a29\u9650\u306e\u30c1\u30a7\u30c3\u30af\n  def admin_label\n    admin? ? \"\u7ba1\u7406\u8005\" : \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\"\n  end\n\n  # \u30b9\u30b3\u30fc\u30d7\u306e\u6761\u4ef6\u5206\u5c90\n  scope :by_status, -&gt;(status) {\n    status ? where(status: status) : all\n  }\n\n  # \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u52d5\u7684\u751f\u6210\n  def custom_validation\n    age &gt;= 18 ? true : errors.add(:age, \"must be 18 or older\")\n  end\nend\n\n# \u30b3\u30f3\u30c8\u30ed\u30fc\u30e9\u3067\u306e\u4f7f\u7528\u4f8b\nclass UsersController &lt; ApplicationController\n  def index\n    @users = params[:status] ? User.by_status(params[:status]) : User.all\n  end\n\n  def show\n    @user = User.find_by(id: params[:id])\n    @title = @user ? \"#{@user.name}\u306e\u30d7\u30ed\u30d5\u30a3\u30fc\u30eb\" : \"\u30e6\u30fc\u30b6\u30fc\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\"\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u69d8\u3005\u306a\u5834\u9762\u3067\u6d3b\u7528\u3067\u304d\u308b\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u4f7f\u3044\u3059\u304e\u308b\u3068\u53ef\u8aad\u6027\u304c\u4f4e\u4e0b\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u306e\u3067\u3001\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u8aac\u660e\u3059\u308b\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u8e0f\u307e\u3048\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">\u4e09\u9805\u6f14\u7b97\u5b50\u4f7f\u7528\u6642\u306e\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h2>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u304c\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\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u5b9f\u52d9\u3067\u306e\u91cd\u8981\u306a\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u30cd\u30b9\u30c8\u306f\u907f\u3051\u308b\u3079\u304d\u7406\u7531\u3068\u4ee3\u66ff\u6848<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u30cd\u30b9\u30c8\u306f\u53ef\u8aad\u6027\u3092\u8457\u3057\u304f\u4f4e\u4e0b\u3055\u305b\u308b\u4e3b\u306a\u8981\u56e0\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=\"\"># \u60aa\u3044\u4f8b\uff1a\u30cd\u30b9\u30c8\u3055\u308c\u305f\u4e09\u9805\u6f14\u7b97\u5b50\ndef determine_status(age, membership)\n  age &gt;= 18 ? \n    (membership == 'premium' ? '\u30d7\u30ec\u30df\u30a2\u30e0\u4f1a\u54e1' : '\u4e00\u822c\u4f1a\u54e1') : \n    (membership == 'premium' ? '\u30b8\u30e5\u30cb\u30a2\u30d7\u30ec\u30df\u30a2\u30e0' : '\u4e00\u822c\u30b8\u30e5\u30cb\u30a2')\nend\n\n# \u826f\u3044\u4f8b\uff1aif-elsif\u6587\u3092\u4f7f\u7528\ndef determine_status(age, membership)\n  if age &gt;= 18\n    membership == 'premium' ? '\u30d7\u30ec\u30df\u30a2\u30e0\u4f1a\u54e1' : '\u4e00\u822c\u4f1a\u54e1'\n  else\n    membership == 'premium' ? '\u30b8\u30e5\u30cb\u30a2\u30d7\u30ec\u30df\u30a2\u30e0' : '\u4e00\u822c\u30b8\u30e5\u30cb\u30a2'\n  end\nend\n\n# \u5225\u306e\u826f\u3044\u4f8b\uff1acase\u6587\u3092\u4f7f\u7528\ndef determine_status(age, membership)\n  case [age &gt;= 18, membership == 'premium']\n  when [true, true]   then '\u30d7\u30ec\u30df\u30a2\u30e0\u4f1a\u54e1'\n  when [true, false]  then '\u4e00\u822c\u4f1a\u54e1'\n  when [false, true]  then '\u30b8\u30e5\u30cb\u30a2\u30d7\u30ec\u30df\u30a2\u30e0'\n  when [false, false] then '\u4e00\u822c\u30b8\u30e5\u30cb\u30a2'\n  end\nend<\/pre>\n\n\n\n<p>\u30cd\u30b9\u30c8\u3092\u907f\u3051\u308b\u3079\u304d\u7406\u7531\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u4f4e\u4e0b\u3059\u308b<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u304c\u56f0\u96e3\u306b\u306a\u308b<\/li>\n\n\n\n<li>\u4fdd\u5b88\u6027\u304c\u60aa\u5316\u3059\u308b<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u30e1\u30f3\u30d0\u30fc\u306e\u7406\u89e3\u304c\u56f0\u96e3\u306b\u306a\u308b<\/li>\n<\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u53ef\u8aad\u6027\u3092\u8003\u616e\u3057\u305f\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u63a8\u5968\u898f\u7d04\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=\"\"># 1. \u6761\u4ef6\u306f\u5358\u7d14\u306b\u3059\u308b\n# \u60aa\u3044\u4f8b\nresult = (a &gt; b &amp;&amp; c &lt; d || e == f) ? x : y\n\n# \u826f\u3044\u4f8b\nis_valid = a &gt; b &amp;&amp; c &lt; d || e == f\nresult = is_valid ? x : y\n\n# 2. \u9577\u3044\u5f0f\u306f\u907f\u3051\u308b\n# \u60aa\u3044\u4f8b\nmessage = count &gt; 0 ? \"\u5168#{count}\u4ef6\u306e\u5546\u54c1\u304c\u691c\u7d22\u3055\u308c\u307e\u3057\u305f\u3002\u3055\u3089\u306b\u8a73\u7d30\u306a\u6761\u4ef6\u3067\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\" : \"\u691c\u7d22\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u5546\u54c1\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\u6761\u4ef6\u3092\u5909\u66f4\u3057\u3066\u518d\u5ea6\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002\"\n\n# \u826f\u3044\u4f8b\ndef search_result_message(count)\n  if count &gt; 0\n    \"\u5168#{count}\u4ef6\u306e\u5546\u54c1\u304c\u691c\u7d22\u3055\u308c\u307e\u3057\u305f\u3002\" \\\n    \"\u3055\u3089\u306b\u8a73\u7d30\u306a\u6761\u4ef6\u3067\u7d5e\u308a\u8fbc\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\"\n  else\n    \"\u691c\u7d22\u6761\u4ef6\u306b\u4e00\u81f4\u3059\u308b\u5546\u54c1\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093\u3067\u3057\u305f\u3002\" \\\n    \"\u6761\u4ef6\u3092\u5909\u66f4\u3057\u3066\u518d\u5ea6\u304a\u8a66\u3057\u304f\u3060\u3055\u3044\u3002\"\n  end\nend\n\n# 3. \u9069\u5207\u306a\u5909\u6570\u540d\u3092\u4f7f\u7528\u3059\u308b\n# \u60aa\u3044\u4f8b\nx = y &gt; 0 ? 1 : 0\n\n# \u826f\u3044\u4f8b\nstatus_code = record_count &gt; 0 ? :active : :inactive<\/pre>\n\n\n\n<p>\u63a8\u5968\u3055\u308c\u308b\u4f7f\u7528\u5834\u9762\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90<\/li>\n\n\n\n<li>\u5909\u6570\u3078\u306e\u5024\u306e\u4ee3\u5165<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>nil\u30c1\u30a7\u30c3\u30af\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3068\u8003\u616e\u70b9<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u95a2\u3059\u308b\u91cd\u8981\u306a\u8003\u616e\u70b9\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=\"\"># 1. \u6761\u4ef6\u8a55\u4fa1\u306e\u6700\u9069\u5316\n# \u60aa\u3044\u4f8b\uff1a\u4e21\u65b9\u306e\u5f0f\u304c\u6bce\u56de\u8a55\u4fa1\u3055\u308c\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\nresult = condition ? heavy_calculation1 : heavy_calculation2\n\n# \u826f\u3044\u4f8b\uff1a\u30e1\u30bd\u30c3\u30c9\u5316\u3057\u3066\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u5b9f\u884c\ndef heavy_calculation1\n  # \u91cd\u3044\u51e6\u7406\nend\n\ndef heavy_calculation2\n  # \u91cd\u3044\u51e6\u7406\nend\n\nresult = if condition\n          heavy_calculation1\n        else\n          heavy_calculation2\n        end\n\n# 2. \u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u6700\u9069\u5316\n# \u60aa\u3044\u4f8b\uff1a\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u751f\u6210\ndata = condition ? large_array.map { |x| complex_transform(x) } : []\n\n# \u826f\u3044\u4f8b\uff1a\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u51e6\u7406\u3092\u5b9f\u884c\ndata = if condition\n         large_array.map { |x| complex_transform(x) }\n       else\n         []\n       end<\/pre>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u91cd\u3044\u51e6\u7406\u306f\u6761\u4ef6\u5206\u5c90\u306e\u5916\u306b\u51fa\u3059<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u306f\u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u884c\u3046<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u306f\u4e8b\u524d\u306b\u884c\u3044\u3001\u7d50\u679c\u3092\u5909\u6570\u306b\u683c\u7d0d\u3059\u308b<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u3092\u5fc3\u304c\u3051\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u4ee5\u4e0a\u306e\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u5b88\u308b\u3053\u3068\u3067\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u3088\u304f\u3042\u308b\u8cea\u554f\u3068\u56de\u7b54\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u3088\u304f\u3042\u308b\u8cea\u554f\u3068\u56de\u7b54<\/h2>\n\n\n\n<p>\u958b\u767a\u73fe\u5834\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u4e09\u9805\u6f14\u7b97\u5b50\u306b\u95a2\u3059\u308b\u7591\u554f\u3068\u3001\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5\u3092\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u65b9\u6cd5<\/h3>\n\n\n\n<p>Q: \u4e09\u9805\u6f14\u7b97\u5b50\u3067\u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u3067\u3059\u304b\uff1f<\/p>\n\n\n\n<p>A: \u8907\u6570\u306e\u6761\u4ef6\u3092\u6271\u3046\u5834\u5408\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u304c\u3042\u308a\u307e\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=\"\"># 1. \u6761\u4ef6\u3092\u5909\u6570\u306b\u307e\u3068\u3081\u308b\ndef user_status(age, premium, active)\n  is_valid = age &gt;= 18 &amp;&amp; premium &amp;&amp; active\n  is_valid ? \"\u6709\u52b9\u306a\u30e6\u30fc\u30b6\u30fc\" : \"\u7121\u52b9\u306a\u30e6\u30fc\u30b6\u30fc\"\nend\n\n# 2. \u30e1\u30bd\u30c3\u30c9\u306b\u6761\u4ef6\u3092\u307e\u3068\u3081\u308b\ndef valid_user?(user)\n  user.age &gt;= 18 &amp;&amp; user.premium? &amp;&amp; user.active?\nend\n\ndef display_status(user)\n  valid_user?(user) ? \"\u6709\u52b9\u306a\u30e6\u30fc\u30b6\u30fc\" : \"\u7121\u52b9\u306a\u30e6\u30fc\u30b6\u30fc\"\nend\n\n# 3. \u8ad6\u7406\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\ndef check_permission(user)\n  user.admin? || user.moderator? ? \"\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\" : \"\u30a2\u30af\u30bb\u30b9\u4e0d\u53ef\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u65b9<\/h3>\n\n\n\n<p>Q: \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3068\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u969b\u306e\u6ce8\u610f\u70b9\u306f\uff1f<\/p>\n\n\n\n<p>A: \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u304c\u6709\u7528\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=\"\"># 1. \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092\u6761\u4ef6\u3068\u3057\u3066\u4f7f\u7528\ndef process_data(data)\n  valid_data?(data) ? process_valid_data(data) : handle_invalid_data(data)\nend\n\n# 2. \u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3067\u306e\u4f7f\u7528\ndef format_user_name(user)\n  user.name.present? ? user.name.titleize : \"\u540d\u524d\u306a\u3057\"\nend\n\n# 3. \u6761\u4ef6\u4ed8\u304d\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\ndef display_price(product)\n  product.on_sale? ? product.calculate_discount_price : product.regular_price\nend\n\n# \u6ce8\u610f\uff1a\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u8907\u96d1\u306a\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306f\u907f\u3051\u308b\n# \u60aa\u3044\u4f8b\nresult = obj.method1.method2 ? obj.method3.method4 : obj.method5.method6<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">nil\u30c1\u30a7\u30c3\u30af\u3067\u306e\u6d3b\u7528\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>Q: nil\u30c1\u30a7\u30c3\u30af\u3092\u52b9\u679c\u7684\u306b\u884c\u3046\u30b3\u30c4\u306f\u3042\u308a\u307e\u3059\u304b\uff1f<\/p>\n\n\n\n<p>A: nil\u30c1\u30a7\u30c3\u30af\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30d1\u30bf\u30fc\u30f3\u304c\u52b9\u679c\u7684\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=\"\"># 1. \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\ndef get_config(options)\n  options ? options[:config] : DEFAULT_CONFIG\nend\n\n# 2. &amp;.\u6f14\u7b97\u5b50\uff08\u307c\u3063\u3061\u6f14\u7b97\u5b50\uff09\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\ndef user_name(user)\n  user&amp;.name ? user.name : \"\u30b2\u30b9\u30c8\"\nend\n\n# 3. \u30d6\u30ed\u30c3\u30af\u8a55\u4fa1\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\ndef process_data(data)\n  data&amp;.empty? ? \"\u30c7\u30fc\u30bf\u306a\u3057\" : yield(data)\nend\n\n# 4. \u914d\u5217\u8981\u7d20\u306enil\u30c1\u30a7\u30c3\u30af\ndef first_element(array)\n  array&amp;.first ? array.first : \"\u7a7a\u306e\u914d\u5217\u3067\u3059\"\nend\n\n# \u3088\u308a\u6d17\u7df4\u3055\u308c\u305f\u66f8\u304d\u65b9\ndef safe_navigation(object)\n  # ||\u6f14\u7b97\u5b50\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n  result = object&amp;.data || \"\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\"\n\n  # try\/tap\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n  object&amp;.tap { |obj| return obj.process if obj.valid? } || \"\u7121\u52b9\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\"\nend<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u30a2\u30c9\u30d0\u30a4\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>nil\u30c1\u30a7\u30c3\u30af\u306e\u57fa\u672c\u539f\u5247\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u80fd\u306a\u9650\u308a\u65e9\u3044\u6bb5\u968e\u3067nil\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306f\u9069\u5207\u306a\u3082\u306e\u3092\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>\u610f\u56f3\u3057\u306a\u3044nil\u306e\u4f1d\u64ad\u3092\u9632\u3050<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u526f\u4f5c\u7528\u306e\u3042\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u6761\u4ef6\u5206\u5c90\u306e\u5916\u3067\u547c\u3073\u51fa\u3059<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306f3\u3064\u307e\u3067\u3092\u76ee\u5b89\u306b\u3059\u308b<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u51e6\u7406\u306f\u5225\u30e1\u30bd\u30c3\u30c9\u306b\u62bd\u51fa\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e\uff1a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u91cd\u3044\u51e6\u7406\u306f\u6761\u4ef6\u8a55\u4fa1\u306e\u524d\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u6d3b\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u8a55\u4fa1\u3092\u907f\u3051\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u8cea\u554f\u3068\u56de\u7b54\u3092\u53c2\u8003\u306b\u3001\u3088\u308a\u52b9\u679c\u7684\u306a\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002\u6b21\u306f\u6700\u5f8c\u306e\u307e\u3068\u3081\u30bb\u30af\u30b7\u30e7\u30f3\u306b\u79fb\u308a\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">\u307e\u3068\u3081\uff1a\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e\u30dd\u30a4\u30f3\u30c8<\/h2>\n\n\n\n<p>\u3053\u306e\u8a18\u4e8b\u3092\u901a\u3058\u3066\u3001Ruby\u306e\u4e09\u9805\u6f14\u7b97\u5b50\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u3053\u3067\u306f\u3001\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u306b\u5411\u3051\u305f\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u3068\u3081\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u304f\u3053\u3068\u3092\u5e38\u306b\u610f\u8b58\u3059\u308b<\/h3>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u539f\u5247\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u57fa\u672c\u3092\u62bc\u3055\u3048\u308b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6761\u4ef6\u5f0f\u306f\u660e\u78ba\u306b<\/li>\n\n\n\n<li>\u8fd4\u3059\u5024\u306f\u4e00\u8cab\u6027\u306e\u3042\u308b\u578b\u306b<\/li>\n\n\n\n<li>1\u884c\u3067\u53ce\u307e\u308b\u7a0b\u5ea6\u306e\u9577\u3055\u306b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u53ef\u8aad\u6027\u3092\u91cd\u8996\u3059\u308b<\/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=\"\">   # \u826f\u3044\u4f8b\uff1a\u610f\u56f3\u304c\u660e\u78ba\n   status = age &gt;= 18 ? \"adult\" : \"minor\"\n\n   # \u826f\u3044\u4f8b\uff1a\u5909\u6570\u540d\u304c\u5206\u304b\u308a\u3084\u3059\u3044\n   is_valid = value.present? ? value : default_value<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u4f7f\u7528\u5834\u9762\u3092\u9078\u3076<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90<\/li>\n\n\n\n<li>\u5909\u6570\u3078\u306e\u5024\u306e\u4ee3\u5165<\/li>\n\n\n\n<li>nil\u30c1\u30a7\u30c3\u30af\u3068\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\u3092\u53c2\u8003\u306b\u6d3b\u7528\u306e\u5e45\u3092\u5e83\u3052\u308b<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306e\u52b9\u679c\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>ActiveRecord\u3067\u306e\u6d3b\u7528<\/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=\"\">   # \u30b9\u30b3\u30fc\u30d7\u3067\u306e\u4f7f\u7528\n   scope :by_status, -&gt;(status) { status ? where(status: status) : all }\n\n   # \u8868\u793a\u7528\u30e1\u30bd\u30c3\u30c9\u3067\u306e\u4f7f\u7528\n   def display_name\n     nickname.present? ? nickname : email\n   end<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>API\u30ec\u30b9\u30dd\u30f3\u30b9\u3067\u306e\u6d3b\u7528<\/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 api_response\n     success? ? { status: 'success', data: result } : { status: 'error', message: error_message }\n   end<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u6d3b\u7528<\/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 validate_user\n     age &gt;= 18 ? true : errors.add(:age, \"must be 18 or older\")\n   end<\/pre>\n\n\n\n<p>\u6700\u5f8c\u306b\u3001\u4e09\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\u306f\u300c\u7c21\u6f54\u3055\u300d\u3068\u300c\u53ef\u8aad\u6027\u300d\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u91cd\u8981\u3067\u3059\u3002\u9069\u5207\u306a\u5834\u9762\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u5411\u4e0a\u306b\u8ca2\u732e\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u304b\u3089\u306e\u5b66\u7fd2\u306e\u65b9\u5411\u6027\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306e\u4f7f\u7528\u4f8b\u3092\u7814\u7a76\u3059\u308b<\/li>\n\n\n\n<li>\u30c1\u30fc\u30e0\u306e\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u3092\u78ba\u8a8d\u3059\u308b<\/li>\n\n\n\n<li>\u3088\u308a\u8907\u96d1\u306a\u30b1\u30fc\u30b9\u3067\u306e\u4ee3\u66ff\u30d1\u30bf\u30fc\u30f3\u3092\u5b66\u3076<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u5f71\u97ff\u3092\u8003\u616e\u3057\u305f\u4f7f\u7528\u65b9\u6cd5\u3092\u63a2\u6c42\u3059\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u4e09\u9805\u6f14\u7b97\u5b50\u306f\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067 Ruby \u30b3\u30fc\u30c9\u3092\u3088\u308a elegant \u306b\u66f8\u304f\u305f\u3081\u306e\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3068\u306a\u308a\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3067\u5b66\u3093\u3060\u5185\u5bb9\u3092\u5b9f\u8df5\u306b\u6d3b\u304b\u3057\u3001\u3088\u308a\u826f\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308b\u3053\u3068\u3092\u9858\u3063\u3066\u3044\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-1552","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\/1552","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=1552"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1552\/revisions"}],"predecessor-version":[{"id":1553,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1552\/revisions\/1553"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1552"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1552"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1552"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}