{"id":1523,"date":"2025-03-24T08:50:30","date_gmt":"2025-03-23T23:50:30","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1523"},"modified":"2025-03-24T08:50:30","modified_gmt":"2025-03-23T23:50:30","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby-sort_by%e3%81%ae%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e7%8f%be%e5%a0%b4%e3%81%a7%e4%bd%bf%e3%81%88%e3%82%8b7%e3%81%a4%e3%81%ae","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1523","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Ruby sort_by\u306e\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u73fe\u5834\u3067\u4f7f\u3048\u308b7\u3064\u306e\u5b9f\u8df5\u30c6\u30af\u30cb\u30c3\u30af"},"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\">sort_by\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">sort_by\u3068\u306f\uff1a\u914d\u5217\u306e\u8981\u7d20\u3092\u81ea\u7531\u306b\u4e26\u3079\u66ff\u3048\u308bRuby\u306e\u5f37\u529b\u306a\u30e1\u30bd\u30c3\u30c9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u5f93\u6765\u306esort\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u6c7a\u5b9a\u7684\u306a\u9055\u3044<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">sort_by\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u7c21\u5358\u306b\u30bd\u30fc\u30c8\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u6570\u5024\u914d\u5217\u306e\u30bd\u30fc\u30c8\u3067\u3088\u304f\u3042\u308b\u30df\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-6\">\u30cf\u30c3\u30b7\u30e5\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-7\">\u5b9f\u8df5\u7684\u306asort_by\u306e\u6d3b\u7528\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-8\">\u8907\u6570\u306e\u6761\u4ef6\u3067\u30bd\u30fc\u30c8\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li>        <a href=\"#i-9\">\u65e5\u672c\u8a9e\u5bfe\u5fdc\uff1a\u6587\u5b57\u30b3\u30fc\u30c9\u3092\u8003\u616e\u3057\u305f\u30bd\u30fc\u30c8\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u30bd\u30fc\u30c8\u306e\u5b9f\u88c5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">sort_by\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">sort_by!\u306b\u3088\u308b\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">sort_by\u3068sort_by!\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u6bd4\u8f03<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">\u5b9f\u52d9\u3067\u306e\u5fdc\u7528\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">ActiveRecord\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30bd\u30fc\u30c8<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-16\">Enumerable#sort_by\u3092\u4f7f\u3063\u305f\u8907\u96d1\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-17\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-18\">nil\u3092\u542b\u3080\u914d\u5217\u306e\u30bd\u30fc\u30c8\u6642\u306e\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-20\">sort_by\u3092\u4f7f\u3063\u305f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b\uff1a\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u306e\u6574\u7406\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u4fdd\u5b88\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30bd\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u306e\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/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\">sort_by\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">sort_by\u3068\u306f\uff1a\u914d\u5217\u306e\u8981\u7d20\u3092\u81ea\u7531\u306b\u4e26\u3079\u66ff\u3048\u308bRuby\u306e\u5f37\u529b\u306a\u30e1\u30bd\u30c3\u30c9<\/h3>\n\n\n\n<p>sort_by\u30e1\u30bd\u30c3\u30c9\u306f\u3001Ruby\u306e<code>Enumerable<\/code>\u30e2\u30b8\u30e5\u30fc\u30eb\u306b\u542b\u307e\u308c\u308b\u5f37\u529b\u306a\u30bd\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306a\u3069\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u8981\u7d20\u3092\u3001\u6307\u5b9a\u3057\u305f\u57fa\u6e96\u306b\u5f93\u3063\u3066\u4e26\u3079\u66ff\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>sort_by\u306e\u6700\u5927\u306e\u7279\u5fb4\u306f\u3001\u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u4e26\u3073\u66ff\u3048\u306e\u57fa\u6e96\u3092\u67d4\u8edf\u306b\u6307\u5b9a\u3067\u304d\u308b\u70b9\u3067\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=\"\">collection.sort_by { |element| criterion }<\/pre>\n\n\n\n<p>\u4f8b\u3048\u3070\u3001\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u9577\u3055\u3067\u30bd\u30fc\u30c8\u3059\u308b\u5834\u5408\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=\"\">names = [\"Alice\", \"Bob\", \"Charlie\", \"David\"]\nsorted_names = names.sort_by { |name| name.length }\n# =&gt; [\"Bob\", \"Alice\", \"David\", \"Charlie\"]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u5f93\u6765\u306esort\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u6c7a\u5b9a\u7684\u306a\u9055\u3044<\/h3>\n\n\n\n<p>sort_by\u3068sort\u306e\u4e3b\u306a\u9055\u3044\u306f\u4ee5\u4e0b\u306e3\u70b9\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044<\/strong><\/li>\n<\/ol>\n\n\n\n<p>sort_by\u306f\u5185\u90e8\u3067\u300c\u30b7\u30e5\u30ef\u30eb\u30c4\u5909\u63db\u300d\u3068\u3044\u3046\u6280\u8853\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u6bd4\u8f03\u6f14\u7b97\u5b50\u3067\u306e\u6bd4\u8f03\u304c\u5fc5\u8981\u306a\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u3067\u306f\u3001sort_by\u306e\u65b9\u304c\u52b9\u7387\u7684\u306b\u52d5\u4f5c\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=\"\"># sort\u306e\u5834\u5408\uff1a\u6bd4\u8f03\u6f14\u7b97\u304c\u8907\u6570\u56de\u5b9f\u884c\u3055\u308c\u308b\narray.sort { |a, b| complex_calculation(a) &lt;=&gt; complex_calculation(b) }\n\n# sort_by\u306e\u5834\u5408\uff1a\u8a08\u7b97\u306f\u5404\u8981\u7d20\u306b\u5bfe\u3057\u30661\u56de\u3060\u3051\narray.sort_by { |element| complex_calculation(element) }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u8a18\u8ff0\u306e\u7c21\u6f54\u3055<\/strong><\/li>\n<\/ol>\n\n\n\n<p>sort_by\u306f\u6bd4\u8f03\u7684\u30b7\u30f3\u30d7\u30eb\u306a\u8a18\u8ff0\u3067\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u3092\u5b9f\u73fe\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=\"\"># sort\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\nusers.sort { |a, b| [a.age, a.name] &lt;=&gt; [b.age, b.name] }\n\n# sort_by\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\uff08\u3088\u308a\u7c21\u6f54\uff09\nusers.sort_by { |user| [user.age, user.name] }<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u7279\u5fb4<\/strong><\/li>\n<\/ol>\n\n\n\n<p>sort_by\u306f\u4e00\u6642\u7684\u306a\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u304c\u82e5\u5e72\u5897\u52a0\u3057\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u306e\u7279\u5fb4\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5834\u5408\u306b\u30e1\u30ea\u30c3\u30c8\u3068\u306a\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=\"\"># \u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u8907\u96d1\u306a\u6761\u4ef6\u3067\u30bd\u30fc\u30c8\u3059\u308b\u5834\u5408\nlarge_objects.sort_by { |obj| [obj.category, obj.created_at] }<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001sort_by\u306f\u7279\u306b\u4ee5\u4e0b\u306e\u30b1\u30fc\u30b9\u3067\u771f\u4fa1\u3092\u767a\u63ee\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u306b\u57fa\u3065\u304f\u30bd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u8907\u6570\u306e\u6761\u4ef6\u3067\u30bd\u30fc\u30c8\u3059\u308b\u5834\u5408<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u91cd\u8996\u3059\u308b\u5834\u5408<\/li>\n<\/ul>\n\n\n\n<p>\u4e00\u65b9\u3067\u3001\u5358\u7d14\u306a\u6bd4\u8f03\u3060\u3051\u306e\u5834\u5408\u306f\u5f93\u6765\u306esort\u30e1\u30bd\u30c3\u30c9\u3067\u3082\u5341\u5206\u306a\u5834\u5408\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=\"\"># \u5358\u7d14\u306a\u6570\u5024\u306e\u6bd4\u8f03\u306a\u3089sort\u3067\u3082\u554f\u984c\u306a\u3044\nnumbers = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]\nnumbers.sort  # =&gt; [1, 1, 2, 3, 3, 4, 5, 5, 5, 6, 9]<\/pre>\n\n\n\n<p>sort_by\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306a\u5834\u9762\u3067\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\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<h2 class=\"wp-block-heading\" id=\"i-3\">sort_by\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u7c21\u5358\u306b\u30bd\u30fc\u30c8\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p>sort_by\u3092\u4f7f\u7528\u3057\u305f\u6587\u5b57\u5217\u306e\u30bd\u30fc\u30c8\u306f\u3001\u65e5\u5e38\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u30b1\u30fc\u30b9\u306e1\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u4e3b\u306a\u4f7f\u7528\u30d1\u30bf\u30fc\u30f3\u3092\u793a\u3057\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=\"\"># \u57fa\u672c\u7684\u306a\u6587\u5b57\u5217\u306e\u30bd\u30fc\u30c8\nwords = [\"banana\", \"apple\", \"cherry\"]\nsorted = words.sort_by { |word| word }\nputs sorted  # =&gt; [\"apple\", \"banana\", \"cherry\"]\n\n# \u6587\u5b57\u5217\u306e\u5f8c\u308d\u304b\u3089\u9806\u306b\u30bd\u30fc\u30c8\nwords = [\"data\", \"code\", \"ruby\"]\nreverse_sorted = words.sort_by { |word| word.reverse }\nputs reverse_sorted  # =&gt; [\"ruby\", \"code\", \"data\"]\n\n# \u7279\u5b9a\u306e\u6587\u5b57\u4f4d\u7f6e\u3067\u30bd\u30fc\u30c8\nwords = [\"cat\", \"dog\", \"bird\"]\nsecond_char_sorted = words.sort_by { |word| word[1] }\nputs second_char_sorted  # =&gt; [\"bird\", \"cat\", \"dog\"]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u6570\u5024\u914d\u5217\u306e\u30bd\u30fc\u30c8\u3067\u3088\u304f\u3042\u308b\u30df\u30b9<\/h3>\n\n\n\n<p>\u6570\u5024\u914d\u5217\u306e\u30bd\u30fc\u30c8\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u843d\u3068\u3057\u7a74\u306b\u6ce8\u610f\u304c\u5fc5\u8981\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=\"\"># \u6b63\u3057\u3044\u6570\u5024\u30bd\u30fc\u30c8\nnumbers = [\"1\", \"2\", \"10\", \"20\", \"3\"]\ncorrect_sort = numbers.sort_by { |num| num.to_i }\nputs correct_sort  # =&gt; [\"1\", \"2\", \"3\", \"10\", \"20\"]\n\n# \u3088\u304f\u3042\u308b\u9593\u9055\u3044\uff08\u6587\u5b57\u5217\u3068\u3057\u3066\u30bd\u30fc\u30c8\uff09\nwrong_sort = numbers.sort_by { |num| num }\nputs wrong_sort  # =&gt; [\"1\", \"10\", \"2\", \"20\", \"3\"]\n\n# \u5c0f\u6570\u70b9\u3092\u542b\u3080\u6570\u5024\u306e\u30bd\u30fc\u30c8\ndecimals = [\"1.5\", \"1.0\", \"2.3\", \"0.8\"]\ndecimal_sort = decimals.sort_by { |num| num.to_f }\nputs decimal_sort  # =&gt; [\"0.8\", \"1.0\", \"1.5\", \"2.3\"]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30cf\u30c3\u30b7\u30e5\u3084\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30bd\u30fc\u30c8\u306f\u3001sort_by\u306e\u771f\u4fa1\u304c\u767a\u63ee\u3055\u308c\u308b\u5834\u9762\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=\"\"># \u30cf\u30c3\u30b7\u30e5\u306e\u914d\u5217\u3092\u30bd\u30fc\u30c8\nusers = [\n  { name: \"Alice\", age: 30 },\n  { name: \"Bob\", age: 25 },\n  { name: \"Charlie\", age: 35 }\n]\n\n# \u5e74\u9f62\u3067\u30bd\u30fc\u30c8\nage_sorted = users.sort_by { |user| user[:age] }\nputs age_sorted\n# =&gt; [{:name=&gt;\"Bob\", :age=&gt;25}, {:name=&gt;\"Alice\", :age=&gt;30}, {:name=&gt;\"Charlie\", :age=&gt;35}]\n\n# \u540d\u524d\u3067\u30bd\u30fc\u30c8\nname_sorted = users.sort_by { |user| user[:name] }\nputs name_sorted\n# =&gt; [{:name=&gt;\"Alice\", :age=&gt;30}, {:name=&gt;\"Bob\", :age=&gt;25}, {:name=&gt;\"Charlie\", :age=&gt;35}]\n\n# \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30bd\u30fc\u30c8\nclass Product\n  attr_reader :name, :price, :stock\n\n  def initialize(name, price, stock)\n    @name = name\n    @price = price\n    @stock = stock\n  end\nend\n\nproducts = [\n  Product.new(\"Phone\", 800, 10),\n  Product.new(\"Laptop\", 1200, 5),\n  Product.new(\"Tablet\", 500, 15)\n]\n\n# \u4fa1\u683c\u3067\u30bd\u30fc\u30c8\nprice_sorted = products.sort_by { |product| product.price }\nprice_sorted.each { |p| puts \"#{p.name}: $#{p.price}\" }\n# =&gt; Tablet: $500\n#    Phone: $800\n#    Laptop: $1200\n\n# \u5728\u5eab\u6570\u3067\u30bd\u30fc\u30c8\nstock_sorted = products.sort_by { |product| product.stock }\nstock_sorted.each { |p| puts \"#{p.name}: #{p.stock} units\" }\n# =&gt; Laptop: 5 units\n#    Phone: 10 units\n#    Tablet: 15 units<\/pre>\n\n\n\n<p>\u4ee5\u4e0a\u306e\u4f8b\u304b\u3089\u3001sort_by\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u306e\u30dd\u30a4\u30f3\u30c8\u306f\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d6\u30ed\u30c3\u30af\u306e\u623b\u308a\u5024\u304c\u6bd4\u8f03\u306e\u57fa\u6e96\u3068\u306a\u308b<\/li>\n\n\n\n<li>\u6570\u5024\u306e\u30bd\u30fc\u30c8\u3067\u306f\u9069\u5207\u306a\u578b\u5909\u63db\u304c\u91cd\u8981<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3082\u3001\u5358\u4e00\u306e\u5c5e\u6027\u3092\u6307\u5b9a\u3059\u308b\u3060\u3051\u3067\u30bd\u30fc\u30c8\u53ef\u80fd<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u67d4\u8edf\u306a\u30bd\u30fc\u30c8\u304c\u5b9f\u73fe\u3067\u304d\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u62bc\u3055\u3048\u3066\u304a\u304f\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u306b\u3082\u5bfe\u5fdc\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-7\">\u5b9f\u8df5\u7684\u306asort_by\u306e\u6d3b\u7528\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u8907\u6570\u306e\u6761\u4ef6\u3067\u30bd\u30fc\u30c8\u3059\u308b\u969b\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>\u8907\u6570\u6761\u4ef6\u3067\u306e\u30bd\u30fc\u30c8\u306f\u5b9f\u52d9\u3067\u3088\u304f\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\u3067\u3059\u3002sort_by\u3067\u306f\u914d\u5217\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u7c21\u6f54\u306b\u5b9f\u88c5\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=\"\"># \u30e6\u30fc\u30b6\u30fc\u3092\u5e74\u9f62\u3068\u540d\u524d\u3067\u4e26\u3073\u66ff\u3048\u308b\nclass User\n  attr_reader :name, :age, :rank\n\n  def initialize(name, age, rank)\n    @name = name\n    @age = age\n    @rank = rank\n  end\nend\n\nusers = [\n  User.new(\"Alice\", 30, \"A\"),\n  User.new(\"Bob\", 30, \"B\"),\n  User.new(\"Charlie\", 25, \"A\"),\n  User.new(\"David\", 35, \"C\")\n]\n\n# \u5e74\u9f62\u306e\u6607\u9806\u3001\u540c\u3058\u5e74\u9f62\u306a\u3089\u540d\u524d\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u9806\nsorted_users = users.sort_by { |user| [user.age, user.name] }\n\n# \u3088\u308a\u8907\u96d1\u306a\u6761\u4ef6\uff1a\u5e74\u9f62\u306e\u6607\u9806\u3001\u30e9\u30f3\u30af\u306e\u964d\u9806\u3001\u540d\u524d\u306e\u30a2\u30eb\u30d5\u30a1\u30d9\u30c3\u30c8\u9806\ncomplex_sort = users.sort_by { |user| [\n  user.age,\n  -\"ABC\".index(user.rank),  # \u30e9\u30f3\u30af\u3092\u9006\u9806\u306b\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\n  user.name\n] }<\/pre>\n\n\n\n<p>\u3088\u308a\u67d4\u8edf\u306a\u30bd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001Proc\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u518d\u5229\u7528\u53ef\u80fd\u306a\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\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=\"\"># \u30bd\u30fc\u30c8\u6761\u4ef6\u3092Proc\u3068\u3057\u3066\u5b9a\u7fa9\nage_name_sorter = Proc.new { |user| [user.age, user.name] }\nrank_sorter = Proc.new { |user| -\"ABC\".index(user.rank) }\n\n# \u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\nsorted_by_age_name = users.sort_by(&amp;age_name_sorter)\nsorted_by_rank = users.sort_by(&amp;rank_sorter)<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u65e5\u672c\u8a9e\u5bfe\u5fdc\uff1a\u6587\u5b57\u30b3\u30fc\u30c9\u3092\u8003\u616e\u3057\u305f\u30bd\u30fc\u30c8\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u65e5\u672c\u8a9e\u306e\u30bd\u30fc\u30c8\u3067\u306f\u6587\u5b57\u30b3\u30fc\u30c9\u306e\u6271\u3044\u306b\u6ce8\u610f\u304c\u5fc5\u8981\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=\"\"># \u57fa\u672c\u7684\u306a\u65e5\u672c\u8a9e\u30bd\u30fc\u30c8\njapanese_words = [\"\u3042\u304b\", \"\u3044\u308d\u306f\", \"\u3046\u307f\", \"\u3048\u304d\", \"\u304a\u3068\"]\nbasic_sort = japanese_words.sort_by { |word| word }\n\n# Unicode\u6b63\u898f\u5316\u3092\u4f7f\u7528\u3057\u305f\u30bd\u30fc\u30c8\nrequire 'unicode_normalize'\n\njapanese_texts = [\"caf\u00e9\", \"cafe\", \"\u304d\u3087\u3046\", \"\u30ad\u30e7\u30a6\", \"\u4eca\u65e5\"]\nnormalized_sort = japanese_texts.sort_by { |text| \n  text.unicode_normalize(:nfkc).downcase\n}\n\n# \u3088\u307f\u304c\u306a\u3067\u30bd\u30fc\u30c8\nclass JapaneseWord\n  attr_reader :kanji, :yomi\n\n  def initialize(kanji, yomi)\n    @kanji = kanji\n    @yomi = yomi\n  end\nend\n\nwords = [\n  JapaneseWord.new(\"\u6f22\u5b57\", \"\u304b\u3093\u3058\"),\n  JapaneseWord.new(\"\u65e5\u672c\u8a9e\", \"\u306b\u307b\u3093\u3054\"),\n  JapaneseWord.new(\"\u8f9e\u66f8\", \"\u3058\u3057\u3087\")\n]\n\nsorted_by_yomi = words.sort_by { |word| word.yomi }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u30bd\u30fc\u30c8\u306e\u5b9f\u88c5<\/h3>\n\n\n\n<p>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u30bd\u30fc\u30c8\u306f\u3001\u56fd\u969b\u5316\u5bfe\u5fdc\u3067\u3088\u304f\u5fc5\u8981\u3068\u306a\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=\"\"># \u57fa\u672c\u7684\u306a\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u30bd\u30fc\u30c8\nmixed_case = [\"Apple\", \"banana\", \"Cherry\", \"date\"]\ncase_insensitive = mixed_case.sort_by { |word| word.downcase }\nputs case_insensitive  # =&gt; [\"Apple\", \"banana\", \"Cherry\", \"date\"]\n\n# \u3088\u308a\u8907\u96d1\u306a\u30b1\u30fc\u30b9\uff1a\u8907\u6570\u306e\u6761\u4ef6\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\nclass Document\n  attr_reader :title, :category, :date\n\n  def initialize(title, category, date)\n    @title = title\n    @category = category\n    @date = date\n  end\nend\n\ndocuments = [\n  Document.new(\"Ruby Guide\", \"Programming\", Time.new(2024, 1, 1)),\n  Document.new(\"python basics\", \"Programming\", Time.new(2024, 2, 1)),\n  Document.new(\"JAVA Tutorial\", \"Programming\", Time.new(2024, 3, 1))\n]\n\n# \u30ab\u30c6\u30b4\u30ea\u30fc\uff08\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u533a\u5225\u306a\u3057\uff09\u2192\u65e5\u4ed8\u2192\u30bf\u30a4\u30c8\u30eb\uff08\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u533a\u5225\u306a\u3057\uff09\u306e\u9806\u3067\u30bd\u30fc\u30c8\nsorted_docs = documents.sort_by { |doc| [\n  doc.category.downcase,\n  doc.date,\n  doc.title.downcase\n] }\n\n# \u30ed\u30b1\u30fc\u30eb\u5bfe\u5fdc\u306e\u30bd\u30fc\u30c8\nrequire 'i18n'\nI18n.available_locales = [:en]\n\ninternational_sort = mixed_case.sort_by { |word| \n  I18n.transliterate(word).downcase\n}<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306asort_by\u306e\u4f7f\u7528\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u304c\u5fc5\u8981\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8907\u6570\u6761\u4ef6\u306e\u30bd\u30fc\u30c8\u3067\u306f\u914d\u5217\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u65e5\u672c\u8a9e\u5bfe\u5fdc\u3067\u306f\u6587\u5b57\u30b3\u30fc\u30c9\u3068Unicode\u6b63\u898f\u5316\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u5834\u5408\u306f\u3001downcase\u7b49\u3067\u6b63\u898f\u5316\u3059\u308b<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u306fProc\u3068\u3057\u3066\u5207\u308a\u51fa\u3059<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u5b9f\u52d9\u3067\u767a\u751f\u3059\u308b\u69d8\u3005\u306a\u30bd\u30fc\u30c8\u8981\u4ef6\u306b\u5bfe\u5fdc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">sort_by\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">sort_by!\u306b\u3088\u308b\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p><code>sort_by!<\/code>\u306f\u914d\u5217\u3092\u76f4\u63a5\u5909\u66f4\u3059\u308b\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u3067\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u3048\u308b\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=\"\"># \u901a\u5e38\u306esort_by\narray = (1..1000).to_a.shuffle\nsorted = array.sort_by { |n| n }  # \u65b0\u3057\u3044\u914d\u5217\u304c\u4f5c\u6210\u3055\u308c\u308b\nputs array.object_id != sorted.object_id  # =&gt; true\n\n# \u7834\u58ca\u7684\u306asort_by!\narray = (1..1000).to_a.shuffle\noriginal_id = array.object_id\narray.sort_by! { |n| n }  # \u540c\u3058\u914d\u5217\u304c\u5909\u66f4\u3055\u308c\u308b\nputs array.object_id == original_id  # =&gt; true\n\n# \u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u4f8b\nclass Item\n  attr_reader :name, :price, :weight\n\n  def initialize(name, price, weight)\n    @name = name\n    @price = price\n    @weight = weight\n  end\nend\n\ninventory = [\n  Item.new(\"Laptop\", 1000, 2.5),\n  Item.new(\"Phone\", 800, 0.2),\n  Item.new(\"Tablet\", 500, 0.5)\n]\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30bd\u30fc\u30c8\ninventory.sort_by! { |item| [item.price, item.weight] }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">sort_by\u3068sort_by!\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u6bd4\u8f03<\/h3>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044\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=\"\">require 'benchmark'\nrequire 'memory_profiler'\n\n# \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u6e96\u5099\ndata = (1..10000).map { |i| { id: i, value: rand(1000) } }\n\ndef benchmark_sort_methods(data)\n  Benchmark.bm(10) do |x|\n    # sort_by\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\n    x.report(\"sort_by:\") do\n      100.times do\n        data_copy = data.dup\n        data_copy.sort_by { |item| item[:value] }\n      end\n    end\n\n    # sort_by!\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\n    x.report(\"sort_by!:\") do\n      100.times do\n        data_copy = data.dup\n        data_copy.sort_by! { |item| item[:value] }\n      end\n    end\n  end\nend\n\n# \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\ndef memory_profile_sort(data)\n  puts \"\\n\u30e1\u30e2\u30ea\u30d7\u30ed\u30d5\u30a1\u30a4\u30eb\u7d50\u679c:\"\n\n  puts \"\\nsort_by:\"\n  MemoryProfiler.report do\n    data.dup.sort_by { |item| item[:value] }\n  end.pretty_print\n\n  puts \"\\nsort_by!:\"\n  MemoryProfiler.report do\n    data.dup.sort_by! { |item| item[:value] }\n  end.pretty_print\nend\n\n# \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u306e\u5b9f\u884c\nbenchmark_sort_methods(data)\nmemory_profile_sort(data)<\/pre>\n\n\n\n<p>\u6700\u9069\u5316\u306e\u305f\u3081\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u30bd\u30fc\u30c8\u6642\u306f<code>sort_by!<\/code>\u3092\u4f7f\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u308b<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u306f\u4e8b\u524d\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\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=\"\"># \u60aa\u3044\u4f8b\uff1a\u8a08\u7b97\u3092\u6bce\u56de\u5b9f\u884c\nitems.sort_by { |item| complex_calculation(item) }\n\n# \u826f\u3044\u4f8b\uff1a\u8a08\u7b97\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\ncached_results = items.map { |item| [item, complex_calculation(item)] }\nsorted_items = cached_results.sort_by { |item, result| result }.map(&amp;:first)\n\n# \u3055\u3089\u306b\u826f\u3044\u4f8b\uff1a\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u30ad\u30e3\u30c3\u30b7\u30e5\nitems.each { |item| item.instance_variable_set(:@cached_result, complex_calculation(item)) }\nitems.sort_by! { |item| item.instance_variable_get(:@cached_result) }<\/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>\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u91cd\u8981\u306a\u5834\u5408\u306f<code>sort_by!<\/code>\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u5143\u306e\u30c7\u30fc\u30bf\u3092\u4fdd\u6301\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u901a\u5e38\u306e<code>sort_by<\/code>\u3092\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u306f\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\u3092\u6700\u5c0f\u9650\u306b<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u691c\u8a0e<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u8a08\u7b97\u30b3\u30b9\u30c8\u306e\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u7d50\u679c\u306e\u30ad\u30e3\u30c3\u30b7\u30e5<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u518d\u8a08\u7b97\u306e\u56de\u907f<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u30bd\u30fc\u30c8\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">\u5b9f\u52d9\u3067\u306e\u5fdc\u7528\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">ActiveRecord\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30bd\u30fc\u30c8<\/h3>\n\n\n\n<p>ActiveRecord\u3067\u306esort_by\u306e\u6d3b\u7528\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u53ef\u8aad\u6027\u306e\u30d0\u30e9\u30f3\u30b9\u304c\u91cd\u8981\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=\"\">class Order &lt; ApplicationRecord\n  belongs_to :user\n  has_many :order_items\n\n  # \u57fa\u672c\u7684\u306a\u30b9\u30b3\u30fc\u30d7\n  scope :recent, -&gt; { where('created_at &gt; ?', 30.days.ago) }\n\n  # \u30ab\u30b9\u30bf\u30e0\u30bd\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\n  def self.sort_by_total_amount\n    all.sort_by { |order| order.order_items.sum(&amp;:amount) }\n  end\n\n  # \u8907\u6570\u6761\u4ef6\u3067\u306e\u30bd\u30fc\u30c8\n  def self.sort_by_priority_and_amount\n    all.includes(:order_items).sort_by do |order|\n      [\n        -order.priority,  # \u512a\u5148\u5ea6\u306e\u964d\u9806\n        -order.order_items.sum(&amp;:amount)  # \u91d1\u984d\u306e\u964d\u9806\n      ]\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nrecent_orders = Order.recent.sort_by_total_amount\npriority_orders = Order.sort_by_priority_and_amount\n\n# N+1\u554f\u984c\u3092\u56de\u907f\u3059\u308b\u30c6\u30af\u30cb\u30c3\u30af\nclass Product &lt; ApplicationRecord\n  has_many :reviews\n  has_one :inventory\n\n  def self.sort_by_rating_and_stock\n    includes(:reviews, :inventory)\n      .all\n      .sort_by do |product|\n        [\n          -product.reviews.average(:rating).to_f,\n          -product.inventory.stock_count\n        ]\n      end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">Enumerable#sort_by\u3092\u4f7f\u3063\u305f\u8907\u96d1\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30bd\u30fc\u30c8\u304c\u5fc5\u8981\u306b\u306a\u308b\u3053\u3068\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=\"\"># \u591a\u6b21\u5143\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u30bd\u30fc\u30c8\nclass SalesAnalytics\n  def initialize(sales_data)\n    @sales_data = sales_data\n  end\n\n  def sort_by_performance\n    @sales_data.sort_by do |data|\n      [\n        -data.revenue,           # \u58f2\u4e0a\u9ad8\u306e\u964d\u9806\n        -data.profit_margin,     # \u5229\u76ca\u7387\u306e\u964d\u9806\n        data.customer_complaints # \u30af\u30ec\u30fc\u30e0\u6570\u306e\u6607\u9806\n      ]\n    end\n  end\n\n  # \u6642\u7cfb\u5217\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\u3068\u30bd\u30fc\u30c8\n  def sort_by_monthly_trend\n    monthly_stats = @sales_data\n      .group_by { |data| data.date.beginning_of_month }\n      .transform_values do |monthly_data|\n        {\n          revenue: monthly_data.sum(&amp;:revenue),\n          growth_rate: calculate_growth_rate(monthly_data)\n        }\n      end\n\n    monthly_stats.sort_by { |date, stats| [-stats[:growth_rate], -stats[:revenue]] }\n  end\n\n  private\n\n  def calculate_growth_rate(data)\n    # \u6210\u9577\u7387\u306e\u8a08\u7b97\u30ed\u30b8\u30c3\u30af\n    return 0 if data.empty?\n    # \u5b9f\u88c5\u7701\u7565\n  end\nend\n\n# \u8907\u96d1\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3068\u30bd\u30fc\u30c8\u306e\u7d44\u307f\u5408\u308f\u305b\nclass ProjectManager\n  def initialize(projects)\n    @projects = projects\n  end\n\n  def sort_by_status_and_deadline\n    @projects\n      .reject { |p| p.cancelled? }\n      .group_by(&amp;:status)\n      .transform_values do |status_projects|\n        status_projects.sort_by do |project|\n          [\n            project.deadline,\n            -project.priority,\n            project.team_size\n          ]\n        end\n      end\n  end\n\n  def sort_by_resource_efficiency\n    @projects.sort_by do |project|\n      efficiency = project.expected_revenue \/ (project.team_size * project.duration_months)\n      [-efficiency, project.risk_score]\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306e\u5fdc\u7528\u306b\u304a\u3051\u308b\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3068\u30e1\u30e2\u30ea\u306e\u4f7f\u7528\u30d0\u30e9\u30f3\u30b9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u53ef\u80fd\u306a\u9650\u308a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u30bd\u30fc\u30c8\u3092\u884c\u3046<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u5185\u30bd\u30fc\u30c8\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u53d6\u5f97<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>includes\/preload\u306b\u3088\u308bN+1\u554f\u984c\u306e\u56de\u907f<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u8a08\u7b97\u306e\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u4fdd\u5b88\u6027<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u3092\u30ab\u30d7\u30bb\u30eb\u5316<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u53ef\u80fd\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u4f5c\u6210<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30b9\u30b3\u30fc\u30d7\u3068\u30af\u30e9\u30b9\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u3068\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>nil\u3084\u7570\u5e38\u5024\u306e\u9069\u5207\u306a\u51e6\u7406<\/li>\n\n\n\n<li>\u30bd\u30fc\u30c8\u57fa\u6e96\u306e\u59a5\u5f53\u6027\u78ba\u8a8d<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u96d1\u306a\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3092\u52b9\u7387\u7684\u306b\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-17\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">nil\u3092\u542b\u3080\u914d\u5217\u306e\u30bd\u30fc\u30c8\u6642\u306e\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<p>nil\u3092\u542b\u3080\u914d\u5217\u306e\u30bd\u30fc\u30c8\u306f\u3001\u4e88\u671f\u305b\u306c\u30a8\u30e9\u30fc\u306e\u539f\u56e0\u3068\u306a\u308a\u3084\u3059\u3044\u554f\u984c\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=\"\"># \u30a8\u30e9\u30fc\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\ndata = [1, nil, 3, nil, 2]\nbegin\n  data.sort_by { |x| x }\nrescue =&gt; e\n  puts \"\u30a8\u30e9\u30fc\u767a\u751f: #{e.message}\"  # comparison of Integer with nil failed\nend\n\n# \u89e3\u6c7a\u65b9\u6cd51: nil\u3092\u9664\u5916\u3057\u3066\u30bd\u30fc\u30c8\nsafe_sort1 = data.compact.sort_by { |x| x }\nputs safe_sort1  # =&gt; [1, 2, 3]\n\n# \u89e3\u6c7a\u65b9\u6cd52: nil\u3092\u7279\u5b9a\u306e\u4f4d\u7f6e\u306b\u914d\u7f6e\nsafe_sort2 = data.sort_by { |x| [x.nil? ? 1 : 0, x || Float::INFINITY] }\nputs safe_sort2  # =&gt; [1, 2, 3, nil, nil]\n\n# \u5b9f\u8df5\u7684\u306a\u4f8b\uff1a\u30e6\u30fc\u30b6\u30fc\u30c7\u30fc\u30bf\u306e\u30bd\u30fc\u30c8\nclass User\n  attr_reader :name, :last_login\n\n  def initialize(name, last_login)\n    @name = name\n    @last_login = last_login\n  end\nend\n\nusers = [\n  User.new(\"Alice\", Time.now - 1.day),\n  User.new(\"Bob\", nil),\n  User.new(\"Charlie\", Time.now - 2.days)\n]\n\n# nil\u3092\u8003\u616e\u3057\u305f\u30bd\u30fc\u30c8\nsorted_users = users.sort_by { |user| user.last_login || Time.at(0) }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u30bd\u30fc\u30c8\u3067\u306f\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316\u304c\u91cd\u8981\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=\"\">class LargeDatasetSorter\n  def initialize(dataset)\n    @dataset = dataset\n  end\n\n  # \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u30bd\u30fc\u30c8\u65b9\u6cd5\n  def memory_efficient_sort\n    # \u30d0\u30c3\u30c1\u51e6\u7406\u3067\u30bd\u30fc\u30c8\n    @dataset.each_slice(1000).map do |batch|\n      batch.sort_by! { |item| item.value }\n    end.reduce { |a, b| merge_sorted_arrays(a, b) }\n  end\n\n  # \u5de8\u5927\u306aCSV\u30d5\u30a1\u30a4\u30eb\u306e\u30bd\u30fc\u30c8\n  def sort_large_csv(input_file, output_file)\n    require 'csv'\n\n    # \u30d8\u30c3\u30c0\u30fc\u306e\u4fdd\u5b58\n    headers = CSV.read(input_file, headers: true).headers\n\n    # \u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u3068\u30bd\u30fc\u30c8\n    sorted_data = File.readlines(input_file)\n                     .drop(1)  # \u30d8\u30c3\u30c0\u30fc\u3092\u30b9\u30ad\u30c3\u30d7\n                     .map { |line| CSV.parse_line(line) }\n                     .sort_by! { |row| row[0] }  # \u6700\u521d\u306e\u30ab\u30e9\u30e0\u3067\u30bd\u30fc\u30c8\n\n    # \u7d50\u679c\u306e\u66f8\u304d\u51fa\u3057\n    CSV.open(output_file, 'w') do |csv|\n      csv &lt;&lt; headers\n      sorted_data.each { |row| csv &lt;&lt; row }\n    end\n  end\n\n  private\n\n  def merge_sorted_arrays(a, b)\n    result = []\n    i = 0\n    j = 0\n\n    while i &lt; a.length &amp;&amp; j &lt; b.length\n      if a[i].value &lt;= b[j].value\n        result &lt;&lt; a[i]\n        i += 1\n      else\n        result &lt;&lt; b[j]\n        j += 1\n      end\n    end\n\n    result.concat(a[i..-1]) if i &lt; a.length\n    result.concat(b[j..-1]) if j &lt; b.length\n    result\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nsorter = LargeDatasetSorter.new(large_dataset)\nsorted_data = sorter.memory_efficient_sort<\/pre>\n\n\n\n<p>\u30e1\u30e2\u30ea\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\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=\"\"># \u30e1\u30e2\u30ea\u6d88\u8cbb\u3092\u6291\u3048\u305f\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\ndef process_large_collection(collection)\n  collection.each_slice(1000) do |batch|\n    batch.sort_by! { |item| item.value }\n    yield batch\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nprocess_large_collection(large_data) do |sorted_batch|\n  save_to_database(sorted_batch)\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u524a\u6e1b<\/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=\"\"># \u4e00\u6642\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u6700\u5c0f\u9650\u306b\nclass DataProcessor\n  def initialize(data)\n    @data = data\n    @cache = {}\n  end\n\n  def sort_with_cache\n    @data.sort_by! do |item|\n      @cache[item.id] ||= expensive_calculation(item)\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u30a8\u30e9\u30fc\u5bfe\u5fdc\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>nil\u30c1\u30a7\u30c3\u30af<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u305anil\u306e\u5b58\u5728\u3092\u8003\u616e\u3059\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u3092\u8a2d\u5b9a<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306f\u30d0\u30c3\u30c1\u51e6\u7406<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u524a\u9664<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5916\u306e\u9069\u5207\u306a\u6355\u6349<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u660e\u78ba\u5316<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u306a\u30bd\u30fc\u30c8\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">sort_by\u3092\u4f7f\u3063\u305f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308b\uff1a\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u306e\u6574\u7406\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u8907\u96d1\u306a\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u3092\u6574\u7406\u3057\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u306b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\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=\"\"># \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u524d\uff1a\u8907\u96d1\u3067\u7406\u89e3\u3057\u306b\u304f\u3044\u30b3\u30fc\u30c9\nclass OrderProcessor\n  def sort_orders(orders)\n    orders.sort_by do |order|\n      [\n        order.priority == 'high' ? 0 : (order.priority == 'medium' ? 1 : 2),\n        -(order.items.sum { |item| item.quantity * item.price }),\n        order.created_at ? order.created_at : Time.new(0),\n        order.status == 'processing' ? 0 : (order.status == 'pending' ? 1 : 2)\n      ]\n    end\n  end\nend\n\n# \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\uff1a\u8cac\u52d9\u3092\u5206\u5272\u3057\u3001\u53ef\u8aad\u6027\u3092\u5411\u4e0a\nclass OrderSorter\n  PRIORITY_RANKS = { 'high' =&gt; 0, 'medium' =&gt; 1, 'low' =&gt; 2 }\n  STATUS_RANKS = { 'processing' =&gt; 0, 'pending' =&gt; 1, 'completed' =&gt; 2 }\n\n  def initialize(orders)\n    @orders = orders\n  end\n\n  def sort_by_business_rules\n    @orders.sort_by { |order| sort_criteria(order) }\n  end\n\n  private\n\n  def sort_criteria(order)\n    [\n      priority_rank(order),\n      -total_amount(order),\n      creation_date(order),\n      status_rank(order)\n    ]\n  end\n\n  def priority_rank(order)\n    PRIORITY_RANKS[order.priority] || Float::INFINITY\n  end\n\n  def total_amount(order)\n    order.items.sum { |item| item.quantity * item.price }\n  end\n\n  def creation_date(order)\n    order.created_at || Time.new(0)\n  end\n\n  def status_rank(order)\n    STATUS_RANKS[order.status] || Float::INFINITY\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u4fdd\u5b88\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30bd\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9\u306e\u8a2d\u8a08\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u3092\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u5f62\u3067\u5b9f\u88c5\u3059\u308b\u305f\u3081\u306e\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3092\u7d39\u4ecb\u3057\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=\"\"># Strategy \u30d1\u30bf\u30fc\u30f3\u3092\u6d3b\u7528\u3057\u305f\u30bd\u30fc\u30c8\u5b9f\u88c5\nmodule SortStrategies\n  class Base\n    def sort(collection)\n      collection.sort_by { |item| sort_criteria(item) }\n    end\n\n    protected\n\n    def sort_criteria(item)\n      raise NotImplementedError\n    end\n  end\n\n  class RevenueBasedSort &lt; Base\n    protected\n\n    def sort_criteria(item)\n      -item.revenue\n    end\n  end\n\n  class MultiCriteriaSort &lt; Base\n    protected\n\n    def sort_criteria(item)\n      [\n        -item.priority_score,\n        -item.revenue,\n        item.created_at\n      ]\n    end\n  end\nend\n\n# Decorator \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u305f\u30bd\u30fc\u30c8\u6a5f\u80fd\u306e\u62e1\u5f35\nclass SortableCollection\n  def initialize(collection)\n    @collection = collection\n  end\n\n  def sort_by_with_nulls_last\n    @collection.sort_by { |item| [item.nil? ? 1 : 0, item] }\n  end\n\n  def sort_by_with_custom_order(custom_order)\n    @collection.sort_by { |item| custom_order.index(item) || Float::INFINITY }\n  end\nend\n\n# Builder \u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3057\u305f\u30bd\u30fc\u30c8\u30af\u30a8\u30ea\u306e\u69cb\u7bc9\nclass SortQueryBuilder\n  def initialize\n    @criteria = []\n  end\n\n  def add_criterion(field, direction = :asc)\n    @criteria &lt;&lt; [field, direction]\n    self\n  end\n\n  def build\n    lambda do |item|\n      @criteria.map do |field, direction|\n        value = item.send(field)\n        direction == :desc ? -value : value\n      end\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nquery = SortQueryBuilder.new\n  .add_criterion(:priority, :desc)\n  .add_criterion(:created_at)\n  .build\n\nitems.sort_by(&amp;query)<\/pre>\n\n\n\n<p>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u3092\u5b88\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=\"\"># \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u524d\nclass Order\n  def sort_and_process\n    sort_by_criteria\n    process_sorted_orders\n    send_notifications\n  end\nend\n\n# \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\nclass OrderSorter\n  def sort_by_criteria(orders)\n    # \u30bd\u30fc\u30c8\u30ed\u30b8\u30c3\u30af\u306e\u307f\u3092\u62c5\u5f53\n  end\nend\n\nclass OrderProcessor\n  def process_orders(sorted_orders)\n    # \u51e6\u7406\u30ed\u30b8\u30c3\u30af\u306e\u307f\u3092\u62c5\u5f53\n  end\nend\n\nclass NotificationService\n  def send_notifications(processed_orders)\n    # \u901a\u77e5\u30ed\u30b8\u30c3\u30af\u306e\u307f\u3092\u62c5\u5f53\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u8a2d\u5b9a\u306e\u5916\u90e8\u5316<\/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=\"\">class ConfigurableSorter\n  def initialize(config)\n    @sort_config = config\n  end\n\n  def sort(collection)\n    collection.sort_by do |item|\n      @sort_config.criteria.map { |criterion| criterion.evaluate(item) }\n    end\n  end\nend\n\n# \u8a2d\u5b9a\u30d5\u30a1\u30a4\u30eb\u3067\u30bd\u30fc\u30c8\u6761\u4ef6\u3092\u7ba1\u7406\nsort_config = {\n  criteria: [\n    { field: :priority, direction: :desc },\n    { field: :created_at, direction: :asc }\n  ]\n}<\/pre>\n\n\n\n<p>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u30c1\u30a7\u30c3\u30af\u30ea\u30b9\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u306e\u6574\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8cac\u52d9\u306e\u660e\u78ba\u306a\u5206\u5272<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u547d\u540d<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u62bd\u51fa<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4fdd\u5b88\u6027\u306e\u5411\u4e0a<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c6\u30b9\u30c8\u306e\u5bb9\u6613\u3055<\/li>\n\n\n\n<li>\u62e1\u5f35\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u8a2d\u5b9a\u306e\u67d4\u8edf\u6027<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u8a08\u7b97\u91cf\u306e\u524a\u6e1b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5\u3092\u9069\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u3001\u7406\u89e3\u3057\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\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; 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