{"id":1538,"date":"2025-03-24T08:50:28","date_gmt":"2025-03-23T23:50:28","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1538"},"modified":"2025-03-24T08:50:28","modified_gmt":"2025-03-23T23:50:28","slug":"ruby%e5%88%9d%e5%bf%83%e8%80%85%e3%81%a7%e3%82%82%e3%82%8f%e3%81%8b%e3%82%8b%ef%bc%81yield%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e8%ac%9b%e5%ba%a7","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1538","title":{"rendered":"Ruby\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\uff01yield\u306e\u4f7f\u3044\u65b9\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\u8b1b\u5ea7\u3010\u5b9f\u8df5\u4f8b20\u500b\u4ed8\u304d\u3011"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\" id=\"i-0\">yield\u3068\u306f\uff1fRuby\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/h1>\n\n\n\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\">yield\u3068\u306f\uff1fRuby\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\">\u30d6\u30ed\u30c3\u30af\u3068yield\u306e\u57fa\u672c\u7684\u306a\u95a2\u4fc2\u6027\u3092\u7406\u89e3\u3057\u3088\u3046<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">yield\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u3068\u4e3b\u306a\u7528\u9014\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">yield\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u30b7\u30f3\u30d7\u30eb\u306ayield\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u5b66\u307c\u3046<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u5f15\u6570\u306e\u6e21\u3057\u65b9\u3068\u623b\u308a\u5024\u306e\u53d7\u3051\u53d6\u308a\u65b9\u3092\u7406\u89e3\u3057\u3088\u3046<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-8\">block_given?\u30e1\u30bd\u30c3\u30c9\u3067\u30a8\u30e9\u30fc\u3092\u9632\u3050<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u5b9f\u8df5\u3067\u4f7f\u3048\u308byield\u30d1\u30bf\u30fc\u30f3\u96c6<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u3067\u6d3b\u7528\u3059\u308byield\u306e\u5b9f\u88c5\u4f8b<\/a>      <\/li>      <li>        <a href=\"#i-12\">\u30a4\u30c6\u30ec\u30fc\u30bf\u3068\u3057\u3066\u306eyield\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">API\u30e9\u30c3\u30d1\u30fc\u3067\u3088\u304f\u4f7f\u308f\u308c\u308byield\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u5bfe\u51e6\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">LocalJumpError \u306e\u539f\u56e0\u3068\u89e3\u6c7a\u7b56<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u5f15\u6570\u4e0d\u4e00\u81f4\u306b\u3088\u308b\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30b9\u30b3\u30fc\u30d7\u95a2\u9023\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-22\">\u5b9f\u8df5\u7684\u306ayield\u306e\u6d3b\u7528\u4e8b\u4f8b20\u9078<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-23\">Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u5b9f\u88c5\u4f8b10\u9078<\/a>      <\/li>      <li>        <a href=\"#i-34\">\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6d3b\u7528\u4f8b5\u9078<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-40\">\u30c6\u30b9\u30c8\u5b9f\u88c5\u3067\u306e\u6d3b\u7528\u4f8b5\u9078<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-46\">yield\u3092\u4f7f\u3063\u305f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u8853<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-47\">\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308byield\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-50\">\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-53\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fyield\u306e\u5b9f\u88c5\u65b9\u6cd5<\/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-1\">\u30d6\u30ed\u30c3\u30af\u3068yield\u306e\u57fa\u672c\u7684\u306a\u95a2\u4fc2\u6027\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n\n\n\n<p>Ruby\u306eyield\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u6e21\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b\u305f\u3081\u306e\u7279\u5225\u306a\u30ad\u30fc\u30ef\u30fc\u30c9\u3067\u3059\u3002\u7c21\u5358\u306b\u8a00\u3048\u3070\u3001\u300c\u30e1\u30bd\u30c3\u30c9\u306e\u9014\u4e2d\u3067\u3001\u547c\u3073\u51fa\u3057\u5143\u306e\u30d6\u30ed\u30c3\u30af\u3092\u5b9f\u884c\u3059\u308b\u300d\u305f\u3081\u306e\u547d\u4ee4\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u7c21\u5358\u306a\u4f8b\u3067\u8aac\u660e\u3057\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=\"\">def greet\n  puts \"\u304a\u306f\u3088\u3046\u3054\u3056\u3044\u307e\u3059\uff01\"\n  yield  # \u3053\u3053\u3067\u30d6\u30ed\u30c3\u30af\u304c\u5b9f\u884c\u3055\u308c\u308b\n  puts \"\u3088\u30441\u65e5\u3092\uff01\"\nend\n\n# \u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3059\u969b\u306b\u30d6\u30ed\u30c3\u30af\u3092\u6e21\u3059\ngreet do\n  puts \"\u7530\u4e2d\u3055\u3093\"\nend\n\n# \u5b9f\u884c\u7d50\u679c\uff1a\n# \u304a\u306f\u3088\u3046\u3054\u3056\u3044\u307e\u3059\uff01\n# \u7530\u4e2d\u3055\u3093\n# \u3088\u30441\u65e5\u3092\uff01<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001<code>greet<\/code>\u30e1\u30bd\u30c3\u30c9\u5185\u306e<code>yield<\/code>\u306e\u90e8\u5206\u3067\u3001\u6e21\u3055\u308c\u305f\u30d6\u30ed\u30c3\u30af\uff08<code>puts \"\u7530\u4e2d\u3055\u3093\"<\/code>\uff09\u304c\u5b9f\u884c\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-2\">yield\u3092\u4f7f\u3046\u30e1\u30ea\u30c3\u30c8\u3068\u4e3b\u306a\u7528\u9014\u3092\u7406\u89e3\u3059\u308b<\/h2>\n\n\n\n<p>yield\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u5f97\u3089\u308c\u308b\u4e3b\u306a\u30e1\u30ea\u30c3\u30c8\u306f\u4ee5\u4e0b\u306e\u901a\u308a\u3067\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u540c\u3058\u30e1\u30bd\u30c3\u30c9\u3092\u7570\u306a\u308b\u30d6\u30ed\u30c3\u30af\u3067\u4f7f\u3044\u56de\u305b\u308b<\/li>\n\n\n\n<li>\u5171\u901a\u306e\u51e6\u7406\u30921\u7b87\u6240\u306b\u307e\u3068\u3081\u3089\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u95a2\u5fc3\u306e\u5206\u96e2<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u6a5f\u80fd\u3068\u30ab\u30b9\u30bf\u30e0\u51e6\u7406\u3092\u5206\u3051\u3089\u308c\u308b<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u898b\u901a\u3057\u304c\u826f\u304f\u306a\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u67d4\u8edf\u6027\u306e\u5411\u4e0a<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5b9f\u884c\u6642\u306b\u52d5\u4f5c\u3092\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3067\u304d\u308b<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u306e\u632f\u308b\u821e\u3044\u3092\u5909\u66f4\u3057\u3084\u3059\u3044<\/li>\n<\/ul>\n\n\n\n<p>\u5177\u4f53\u7684\u306a\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=\"\"># \u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u306e\u4f8b\ndef process_file(filename)\n  file = File.open(filename, 'r')\n  yield(file)  # \u30d5\u30a1\u30a4\u30eb\u306e\u51e6\u7406\u3092\u30d6\u30ed\u30c3\u30af\u306b\u59d4\u8b72\nensure\n  file.close\nend\n\n# \u4f7f\u7528\u4f8b1\uff1a\u30d5\u30a1\u30a4\u30eb\u306e\u5185\u5bb9\u3092\u51fa\u529b\nprocess_file('sample.txt') do |file|\n  puts file.read\nend\n\n# \u4f7f\u7528\u4f8b2\uff1a\u7279\u5b9a\u306e\u884c\u3060\u3051\u3092\u51e6\u7406\nprocess_file('sample.txt') do |file|\n  file.each_line.with_index do |line, i|\n    puts line if i.even?  # \u5076\u6570\u884c\u3060\u3051\u3092\u51fa\u529b\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u306e\u4f8b\u3067\u306f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30fc\u30d7\u30f3\u3068\u30af\u30ed\u30fc\u30ba\u3068\u3044\u3046\u5171\u901a\u51e6\u7406\u3092\u30e1\u30bd\u30c3\u30c9\u306b\u5b9a\u7fa9\u3057\u3001\u5b9f\u969b\u306e\u30d5\u30a1\u30a4\u30eb\u51e6\u7406\u306f\u30d6\u30ed\u30c3\u30af\u3067\u67d4\u8edf\u306b\u5909\u66f4\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">yield\u306e\u4e3b\u306a\u7528\u9014<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u4f5c\u6210<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u9806\u306b\u51e6\u7406<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u306e\u7e70\u308a\u8fd4\u3057\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30d5\u30a1\u30a4\u30eb\u306e\u30aa\u30fc\u30d7\u30f3\/\u30af\u30ed\u30fc\u30ba<\/li>\n\n\n\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30b3\u30cd\u30af\u30b7\u30e7\u30f3\u306e\u7ba1\u7406<\/li>\n\n\n\n<li>\u30ed\u30c3\u30af\u306e\u5236\u5fa1<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30eb\u30d0\u30c3\u30af\u51e6\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30d9\u30f3\u30c8\u51e6\u7406<\/li>\n\n\n\n<li>\u30d5\u30c3\u30af\u6a5f\u80fd\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u30e1\u30bd\u30c3\u30c9<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5171\u901a\u51e6\u7406\u306e\u30d5\u30ec\u30fc\u30e0\u30ef\u30fc\u30af\u4f5c\u6210<\/li>\n\n\n\n<li>\u30d7\u30e9\u30b0\u30a4\u30f3\u6a5f\u69cb\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n\n\n\n<p>yield\u306f\u3001Ruby\u306e\u5f37\u529b\u306a\u6a5f\u80fd\u306e1\u3064\u3067\u3042\u308a\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u4fdd\u5b88\u6027\u304c\u9ad8\u304f\u3001\u67d4\u8edf\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u521d\u5fc3\u8005\u306e\u65b9\u306f\u3001\u307e\u305a\u306f\u7c21\u5358\u306a\u4f8b\u304b\u3089\u59cb\u3081\u3066\u3001\u5f90\u3005\u306b\u8907\u96d1\u306a\u4f7f\u7528\u65b9\u6cd5\u306b\u6311\u6226\u3057\u3066\u3044\u304f\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-4\">yield\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-5\">\u30b7\u30f3\u30d7\u30eb\u306ayield\u306e\u5b9f\u88c5\u65b9\u6cd5\u3092\u5b66\u307c\u3046<\/h2>\n\n\n\n<p>yield\u306e\u57fa\u672c\u7684\u306a\u5b9f\u88c5\u306f\u975e\u5e38\u306b\u30b7\u30f3\u30d7\u30eb\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u899a\u3048\u3066\u304a\u304f\u3068\u826f\u3044\u3067\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=\"\"># \u57fa\u672c\u30d1\u30bf\u30fc\u30f31: \u30b7\u30f3\u30d7\u30eb\u306ayield\ndef simple_yield\n  puts \"\u51e6\u7406\u958b\u59cb\"\n  yield\n  puts \"\u51e6\u7406\u7d42\u4e86\"\nend\n\n# \u4f7f\u7528\u4f8b\nsimple_yield do\n  puts \"\u30d6\u30ed\u30c3\u30af\u5185\u306e\u51e6\u7406\"\nend\n\n# \u57fa\u672c\u30d1\u30bf\u30fc\u30f32: \u8907\u6570\u56de\u306eyield\ndef multiple_yields\n  puts \"1\u56de\u76ee\u306e\u524d\"\n  yield\n  puts \"2\u56de\u76ee\u306e\u524d\"\n  yield\n  puts \"\u51e6\u7406\u5b8c\u4e86\"\nend\n\n# \u4f7f\u7528\u4f8b\nmultiple_yields do\n  puts \"\u30d6\u30ed\u30c3\u30af\u304c\u5b9f\u884c\u3055\u308c\u307e\u3057\u305f\"\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u5f15\u6570\u306e\u6e21\u3057\u65b9\u3068\u623b\u308a\u5024\u306e\u53d7\u3051\u53d6\u308a\u65b9\u3092\u7406\u89e3\u3057\u3088\u3046<\/h2>\n\n\n\n<p>yield\u3092\u4f7f\u3046\u969b\u306e\u5f15\u6570\u306e\u6271\u3044\u65b9\u306f\u3001\u30e1\u30bd\u30c3\u30c9\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\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=\"\"># \u5f15\u6570\u3092\u6e21\u3059\u30d1\u30bf\u30fc\u30f3\ndef yield_with_args\n  puts \"\u51e6\u7406\u958b\u59cb\"\n  result = yield(\"\u3053\u3093\u306b\u3061\u306f\", 42)  # \u8907\u6570\u306e\u5f15\u6570\u3092\u6e21\u3059\n  puts \"\u30d6\u30ed\u30c3\u30af\u304b\u3089\u306e\u623b\u308a\u5024: #{result}\"\n  puts \"\u51e6\u7406\u7d42\u4e86\"\nend\n\n# \u4f7f\u7528\u4f8b\nyield_with_args do |greeting, number|\n  puts \"#{greeting} - #{number}\"\n  \"\u51e6\u7406\u5b8c\u4e86\uff01\"  # \u30d6\u30ed\u30c3\u30af\u306e\u623b\u308a\u5024\nend\n\n# \u914d\u5217\u3092\u6e21\u3059\u30d1\u30bf\u30fc\u30f3\ndef process_array\n  [1, 2, 3].each do |num|\n    yield(num, num * 2)  # \u8981\u7d20\u3068\u8a08\u7b97\u7d50\u679c\u3092\u6e21\u3059\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nprocess_array do |number, doubled|\n  puts \"\u6570\u5024: #{number}, 2\u500d: #{doubled}\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u5f15\u6570\u306e\u53d7\u3051\u6e21\u3057\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5f15\u6570\u306e\u578b\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def safe_yield(arg)\n  raise ArgumentError, \"\u6570\u5024\u3092\u6307\u5b9a\u3057\u3066\u304f\u3060\u3055\u3044\" unless arg.is_a?(Numeric)\n  yield(arg)\nend\n\n# \u4f7f\u7528\u4f8b\nsafe_yield(42) { |n| puts n * 2 }  # OK\nsafe_yield(\"string\") { |n| puts n } # ArgumentError<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def yield_with_default\n  result = yield(block_given? ? 42 : 0)\n  puts \"\u7d50\u679c: #{result}\"\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">block_given?\u30e1\u30bd\u30c3\u30c9\u3067\u30a8\u30e9\u30fc\u3092\u9632\u3050<\/h2>\n\n\n\n<p><code>block_given?<\/code>\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30d6\u30ed\u30c3\u30af\u304c\u6e21\u3055\u308c\u305f\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3059\u308b\u91cd\u8981\u306a\u30e1\u30bd\u30c3\u30c9\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=\"\">def safe_method\n  if block_given?\n    puts \"\u30d6\u30ed\u30c3\u30af\u5b9f\u884c\u524d\"\n    yield\n    puts \"\u30d6\u30ed\u30c3\u30af\u5b9f\u884c\u5f8c\"\n  else\n    puts \"\u30d6\u30ed\u30c3\u30af\u304c\u6e21\u3055\u308c\u3066\u3044\u307e\u305b\u3093\"\n  end\nend\n\n# \u4f7f\u7528\u4f8b1: \u30d6\u30ed\u30c3\u30af\u3042\u308a\nsafe_method do\n  puts \"\u30d6\u30ed\u30c3\u30af\u5185\u306e\u51e6\u7406\"\nend\n\n# \u4f7f\u7528\u4f8b2: \u30d6\u30ed\u30c3\u30af\u306a\u3057\nsafe_method  # \u30a8\u30e9\u30fc\u306b\u306a\u3089\u306a\u3044\n\n# \u3088\u308a\u5b9f\u8df5\u7684\u306a\u4f8b\ndef process_data(data)\n  return data unless block_given?  # \u30d6\u30ed\u30c3\u30af\u304c\u306a\u3044\u5834\u5408\u306f\u305d\u306e\u307e\u307e\u8fd4\u3059\n\n  result = []\n  data.each do |item|\n    processed = yield(item)\n    result &lt;&lt; processed\n  end\n  result\nend\n\n# \u4f7f\u7528\u4f8b\nnumbers = [1, 2, 3, 4, 5]\ndoubles = process_data(numbers) { |n| n * 2 }  # \u30d6\u30ed\u30c3\u30af\u3042\u308a\noriginals = process_data(numbers)              # \u30d6\u30ed\u30c3\u30af\u306a\u3057<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5fc5\u9808\u30d6\u30ed\u30c3\u30af\u306e\u6307\u5b9a<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def required_block\n  raise LocalJumpError, \"\u30d6\u30ed\u30c3\u30af\u304c\u5fc5\u8981\u3067\u3059\" unless block_given?\n  yield\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u623b\u308a\u5024\u306e\u578b\u30c1\u30a7\u30c3\u30af<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def validated_yield\n  result = yield\n  raise TypeError, \"\u30d6\u30ed\u30c3\u30af\u306f\u6570\u5024\u3092\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\" unless result.is_a?(Numeric)\n  result\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\u3092\u62bc\u3055\u3048\u308b\u3053\u3068\u3067\u3001yield\u3092\u4f7f\u3063\u305f\u5b89\u5168\u3067\u52b9\u679c\u7684\u306a\u30b3\u30fc\u30c9\u304c\u66f8\u3051\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u591a\u3044\u306e\u3067\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3092\u3057\u3063\u304b\u308a\u3068\u7406\u89e3\u3057\u3066\u304a\u304f\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-10\">\u5b9f\u8df5\u3067\u4f7f\u3048\u308byield\u30d1\u30bf\u30fc\u30f3\u96c6<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u3067\u6d3b\u7528\u3059\u308byield\u306e\u5b9f\u88c5\u4f8b<\/h2>\n\n\n\n<p>\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u306f\u3001yield\u306e\u6700\u3082\u4e00\u822c\u7684\u306a\u4f7f\u7528\u4f8b\u306e1\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u5b9f\u7528\u7684\u306a\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\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u30d1\u30bf\u30fc\u30f3\ndef read_file(filename)\n  File.open(filename, 'r') do |file|\n    yield(file)\n  end\nrescue Errno::ENOENT\n  puts \"\u30d5\u30a1\u30a4\u30eb\u304c\u898b\u3064\u304b\u308a\u307e\u305b\u3093: #{filename}\"\nend\n\n# CSV\u51e6\u7406\u30d1\u30bf\u30fc\u30f3\ndef process_csv(filename)\n  require 'csv'\n  CSV.open(filename, headers: true) do |csv|\n    csv.each do |row|\n      yield(row)\n    end\n  end\nend\n\n# \u30d0\u30c3\u30c1\u51e6\u7406\u30d1\u30bf\u30fc\u30f3\ndef batch_process(directory)\n  Dir.glob(\"#{directory}\/*.txt\") do |file|\n    File.open(file, 'r') do |f|\n      yield(f, File.basename(file))\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nbatch_process('.\/documents') do |file, name|\n  content = file.read\n  puts \"\u30d5\u30a1\u30a4\u30eb #{name} \u306e\u5185\u5bb9: #{content.length}\u6587\u5b57\"\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">\u30a4\u30c6\u30ec\u30fc\u30bf\u3068\u3057\u3066\u306eyield\u306e\u6d3b\u7528\u65b9\u6cd5<\/h2>\n\n\n\n<p>\u30ab\u30b9\u30bf\u30e0\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u4f5c\u6210\u306f\u3001yield\u306e\u5f37\u529b\u306a\u4f7f\u7528\u4f8b\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=\"\"># \u30ab\u30b9\u30bf\u30e0\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u5b9f\u88c5\nclass NumberSequence\n  def initialize(start, end_num)\n    @start = start\n    @end = end_num\n  end\n\n  def each_even\n    (@start..@end).each do |num|\n      yield(num) if num.even?\n    end\n  end\n\n  def each_with_index_and_value\n    index = 0\n    (@start..@end).each do |num|\n      yield(index, num, num * 2)\n      index += 1\n    end\n  end\nend\n\n# \u30da\u30fc\u30b8\u30cd\u30fc\u30b7\u30e7\u30f3\u51e6\u7406\u306e\u5b9f\u88c5\nclass Paginator\n  def initialize(items, per_page)\n    @items = items\n    @per_page = per_page\n  end\n\n  def each_page\n    (@items.length.to_f \/ @per_page).ceil.times do |page_num|\n      start_idx = page_num * @per_page\n      end_idx = start_idx + @per_page - 1\n      yield(@items[start_idx..end_idx], page_num + 1)\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\npaginator = Paginator.new((1..100).to_a, 10)\npaginator.each_page do |items, page|\n  puts \"\u30da\u30fc\u30b8 #{page}: #{items.inspect}\"\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-13\">API\u30e9\u30c3\u30d1\u30fc\u3067\u3088\u304f\u4f7f\u308f\u308c\u308byield\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<p>API\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u306e\u5b9f\u88c5\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\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=\"\"># \u57fa\u672c\u7684\u306aAPI\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\u30e9\u30c3\u30d1\u30fc\nclass APIClient\n  def initialize(base_url, api_key)\n    @base_url = base_url\n    @api_key = api_key\n  end\n\n  def get(endpoint)\n    response = make_request(:get, endpoint)\n    if block_given?\n      yield(response)\n    else\n      response\n    end\n  end\n\n  private\n\n  def make_request(method, endpoint)\n    # \u5b9f\u969b\u306e\u30ea\u30af\u30a8\u30b9\u30c8\u51e6\u7406\uff08\u4f8b\u793a\u7528\u306e\u7c21\u7565\u5316\u3057\u305f\u30b3\u30fc\u30c9\uff09\n    { status: 200, data: { message: \"Success\" } }\n  end\nend\n\n# \u30ea\u30c8\u30e9\u30a4\u6a5f\u80fd\u4ed8\u304dAPI\u30af\u30e9\u30a4\u30a2\u30f3\u30c8\nclass RetryableAPIClient\n  def initialize(max_retries = 3)\n    @max_retries = max_retries\n  end\n\n  def with_retry\n    retries = 0\n    begin\n      yield\n    rescue StandardError =&gt; e\n      retries += 1\n      if retries &lt;= @max_retries\n        sleep(2 ** retries)  # \u6307\u6570\u30d0\u30c3\u30af\u30aa\u30d5\n        retry\n      else\n        raise e\n      end\n    end\n  end\nend\n\n# \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7ba1\u7406\u30d1\u30bf\u30fc\u30f3\nclass DatabaseTransaction\n  def self.transaction\n    begin\n      self.begin_transaction\n      result = yield\n      self.commit\n      result\n    rescue StandardError =&gt; e\n      self.rollback\n      raise e\n    end\n  end\n\n  private\n\n  def self.begin_transaction\n    puts \"\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u958b\u59cb\"\n  end\n\n  def self.commit\n    puts \"\u30b3\u30df\u30c3\u30c8\"\n  end\n\n  def self.rollback\n    puts \"\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\"\n  end\nend\n\n# \u4f7f\u7528\u4f8b\napi_client = APIClient.new('https:\/\/api.example.com', 'api_key')\napi_client.get('\/users') do |response|\n  puts \"\u30b9\u30c6\u30fc\u30bf\u30b9: #{response[:status]}\"\n  puts \"\u30c7\u30fc\u30bf: #{response[:data]}\"\nend\n\nretryable = RetryableAPIClient.new\nretryable.with_retry do\n  # API\u30ea\u30af\u30a8\u30b9\u30c8\u306a\u3069\u3001\u5931\u6557\u3059\u308b\u53ef\u80fd\u6027\u306e\u3042\u308b\u51e6\u7406\n  puts \"API\u547c\u3073\u51fa\u3057\u5b9f\u884c\"\nend\n\nDatabaseTransaction.transaction do\n  # \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c\n  puts \"\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u64cd\u4f5c\u5b9f\u884c\"\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u5b9f\u8df5\u7684\u306a\u4f8b\u3067\u3059\u3002\u7279\u306b\u6ce8\u610f\u3059\u3079\u304d\u70b9\u3068\u3057\u3066\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e\u3092\u78ba\u5b9f\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u30d6\u30ed\u30c3\u30af\u306e\u623b\u308a\u5024\u3092\u9069\u5207\u306b\u6271\u3046<\/li>\n\n\n\n<li>\u518d\u5229\u7528\u6027\u3092\u8003\u616e\u3057\u305f\u8a2d\u8a08\u3092\u5fc3\u304c\u3051\u308b<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u57fa\u790e\u3068\u3057\u3066\u3001\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306e\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u52b9\u7387\u7684\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-14\">\u3088\u304f\u3042\u308b\u30a8\u30e9\u30fc\u3068\u5bfe\u51e6\u65b9\u6cd5<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-15\">LocalJumpError \u306e\u539f\u56e0\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<p><code>LocalJumpError<\/code>\u306f\u3001yield\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u3088\u304f\u906d\u9047\u3059\u308b\u30a8\u30e9\u30fc\u306e1\u3064\u3067\u3059\u3002\u4e3b\u306a\u539f\u56e0\u3068\u89e3\u6c7a\u7b56\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">1. \u30d6\u30ed\u30c3\u30af\u306a\u3057\u3067yield\u3092\u547c\u3073\u51fa\u3057\u305f\u5834\u5408<\/h3>\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\u30b3\u30fc\u30c9\ndef problematic_method\n  puts \"\u958b\u59cb\"\n  yield  # \u30d6\u30ed\u30c3\u30af\u306a\u3057\u3067\u547c\u3073\u51fa\u3059\u3068LocalJumpError\n  puts \"\u7d42\u4e86\"\nend\n\n# \u30a8\u30e9\u30fc\u4f8b\nproblematic_method  # LocalJumpError: no block given (yield)\n\n# \u89e3\u6c7a\u7b561: block_given?\u306b\u3088\u308b\u9632\u5fa1\ndef safe_method\n  puts \"\u958b\u59cb\"\n  yield if block_given?\n  puts \"\u7d42\u4e86\"\nend\n\n# \u89e3\u6c7a\u7b562: require\u30d6\u30ed\u30c3\u30af\u30d1\u30bf\u30fc\u30f3\ndef strict_method\n  raise LocalJumpError, \"\u30d6\u30ed\u30c3\u30af\u304c\u5fc5\u8981\u3067\u3059\" unless block_given?\n  puts \"\u958b\u59cb\"\n  yield\n  puts \"\u7d42\u4e86\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">2. \u30e1\u30bd\u30c3\u30c9\u5916\u3067\u306eyield\u4f7f\u7528<\/h3>\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\u30b3\u30fc\u30c9\nclass BadExample\n  yield  # \u30e1\u30bd\u30c3\u30c9\u5916\u3067yield\u3092\u4f7f\u7528\n\n  # \u89e3\u6c7a\u7b56\uff1a\u30e1\u30bd\u30c3\u30c9\u5185\u3067\u4f7f\u7528\u3059\u308b\n  def correct_method\n    yield if block_given?\n  end\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-18\">\u5f15\u6570\u4e0d\u4e00\u81f4\u306b\u3088\u308b\u30a8\u30e9\u30fc\u306e\u5bfe\u51e6\u6cd5<\/h2>\n\n\n\n<p>\u5f15\u6570\u306e\u6570\u3084\u578b\u306e\u4e0d\u4e00\u81f4\u306b\u3088\u308b\u30a8\u30e9\u30fc\u306f\u983b\u7e41\u306b\u767a\u751f\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=\"\"># \u5f15\u6570\u306e\u6570\u304c\u4e0d\u4e00\u81f4\u306e\u4f8b\ndef process_data\n  yield(\"data\", 42)  # 2\u3064\u306e\u5f15\u6570\u3092\u6e21\u3059\nend\n\n# \u30a8\u30e9\u30fc\u30b1\u30fc\u30b9\nprocess_data do |data|  # 1\u3064\u306e\u5f15\u6570\u3057\u304b\u53d7\u3051\u53d6\u3089\u306a\u3044\n  puts data\nend\n\n# \u89e3\u6c7a\u7b561: \u5f15\u6570\u306e\u6570\u3092\u5408\u308f\u305b\u308b\nprocess_data do |data, number|\n  puts \"#{data}: #{number}\"\nend\n\n# \u89e3\u6c7a\u7b562: \u53ef\u5909\u9577\u5f15\u6570\u3092\u4f7f\u7528\ndef flexible_process\n  yield(*[1, 2, 3])\nend\n\nflexible_process do |*args|\n  puts \"\u53d7\u3051\u53d6\u3063\u305f\u5f15\u6570: #{args.inspect}\"\nend\n\n# \u89e3\u6c7a\u7b563: \u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u8a2d\u5b9a\ndef process_with_defaults\n  yield(\"data\", default_value = 42)\nend\n\nprocess_with_defaults do |data, value = 0|\n  puts \"#{data}: #{value}\"\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u30b9\u30b3\u30fc\u30d7\u95a2\u9023\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0<\/h2>\n\n\n\n<p>\u30b9\u30b3\u30fc\u30d7\u306e\u554f\u984c\u306f\u7279\u306b\u6ce8\u610f\u304c\u5fc5\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=\"\"># \u30b9\u30b3\u30fc\u30d7\u306e\u554f\u984c\u4f8b\nclass ScopeExample\n  def initialize\n    @value = 42\n  end\n\n  # \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\n  def problematic_method\n    [1, 2, 3].each do |i|\n      yield @value  # \u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u30b9\u30b3\u30fc\u30d7\n    end\n  end\n\n  # \u89e3\u6c7a\u7b561: \u660e\u793a\u7684\u306a\u5909\u6570\u6e21\u3057\n  def better_method\n    value = @value\n    [1, 2, 3].each do |i|\n      yield value, i\n    end\n  end\n\n  # \u89e3\u6c7a\u7b562: binding\u306e\u5229\u7528\n  def advanced_method(&amp;block)\n    instance_eval(&amp;block)\n  end\nend\n\n# \u30b9\u30b3\u30fc\u30d7\u306e\u5171\u6709\u4f8b\nexample = ScopeExample.new\nexample.advanced_method do\n  puts @value  # 42\u304c\u51fa\u529b\u3055\u308c\u308b\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u3088\u304f\u3042\u308b\u30b9\u30b3\u30fc\u30d7\u554f\u984c\u306e\u89e3\u6c7a\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30af\u30ed\u30fc\u30b8\u30e3\u306e\u6d3b\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def create_counter\n  count = 0\n  -&gt; { count += 1 }\nend\n\ncounter = create_counter\nputs counter.call  # 1\nputs counter.call  # 2<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u5909\u6570\u306e\u5171\u6709<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class ShareExample\n  def initialize\n    @shared = []\n  end\n\n  def process\n    yield @shared\n    puts \"\u51e6\u7406\u5f8c\u306e@shared: #{@shared.inspect}\"\n  end\nend\n\nexample = ShareExample.new\nexample.process do |shared|\n  shared &lt;&lt; \"\u30c7\u30fc\u30bf1\"\n  shared &lt;&lt; \"\u30c7\u30fc\u30bf2\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30c7\u30d0\u30c3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30c7\u30d0\u30c3\u30b0\u7528\u306e\u30ed\u30ae\u30f3\u30b0\u8ffd\u52a0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def debug_yield\n  puts \"\u30e1\u30bd\u30c3\u30c9\u958b\u59cb\"\n  begin\n    puts \"yield\u306e\u76f4\u524d\"\n    result = yield\n    puts \"yield\u5b8c\u4e86: #{result.inspect}\"\n  rescue =&gt; e\n    puts \"\u30a8\u30e9\u30fc\u767a\u751f: #{e.class} - #{e.message}\"\n    raise\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u6bb5\u968e\u7684\u306a\u30c7\u30d0\u30c3\u30b0<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def step_by_step_debug\n  puts \"\u30b9\u30c6\u30c3\u30d71: \u958b\u59cb\"\n  value = yield(1)\n  puts \"\u30b9\u30c6\u30c3\u30d72: \u6700\u521d\u306eyield\u5b8c\u4e86 - #{value}\"\n  value = yield(2)\n  puts \"\u30b9\u30c6\u30c3\u30d73: 2\u56de\u76ee\u306eyield\u5b8c\u4e86 - #{value}\"\n  value\nrescue =&gt; e\n  puts \"\u30a8\u30e9\u30fc\u767a\u751f: #{e.class} at #{e.backtrace.first}\"\n  raise\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30a8\u30e9\u30fc\u30d1\u30bf\u30fc\u30f3\u3068\u89e3\u6c7a\u7b56\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001yield\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u304c\u30b9\u30e0\u30fc\u30ba\u306b\u306a\u308a\u307e\u3059\u3002\u30a8\u30e9\u30fc\u304c\u767a\u751f\u3057\u305f\u5834\u5408\u306f\u3001\u307e\u305a\u30a8\u30e9\u30fc\u30e1\u30c3\u30bb\u30fc\u30b8\u3092\u78ba\u8a8d\u3057\u3001\u9069\u5207\u306a\u5bfe\u51e6\u65b9\u6cd5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-22\">\u5b9f\u8df5\u7684\u306ayield\u306e\u6d3b\u7528\u4e8b\u4f8b20\u9078<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">Web\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3067\u306e\u5b9f\u88c5\u4f8b10\u9078<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">1. \u30ec\u30a4\u30a2\u30a6\u30c8\u30c6\u30f3\u30d7\u30ec\u30fc\u30c8\u306e\u5b9f\u88c5<\/h3>\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 Layout\n  def render\n    &lt;&lt;-HTML\n      &lt;!DOCTYPE html&gt;\n      &lt;html&gt;\n        &lt;head&gt;&lt;title&gt;My App&lt;\/title&gt;&lt;\/head&gt;\n        &lt;body&gt;\n          #{yield}\n        &lt;\/body&gt;\n      &lt;\/html&gt;\n    HTML\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nlayout = Layout.new\ncontent = layout.render { \"&lt;h1&gt;Welcome!&lt;\/h1&gt;\" }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">2. \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7ba1\u7406<\/h3>\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=\"\">module DatabaseTransaction\n  def self.transaction\n    begin\n      ActiveRecord::Base.transaction do\n        yield\n      end\n    rescue =&gt; e\n      Rails.logger.error(\"Transaction failed: #{e.message}\")\n      raise\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nDatabaseTransaction.transaction do\n  user.save!\n  notification.send!\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-26\">3. \u30ad\u30e3\u30c3\u30b7\u30e5\u5236\u5fa1<\/h3>\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 CacheManager\n  def self.with_cache(key, expires_in: 1.hour)\n    Rails.cache.fetch(key, expires_in: expires_in) do\n      yield\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nCacheManager.with_cache(\"user_count\") do\n  User.count  # \u91cd\u3044\u51e6\u7406\u306e\u7d50\u679c\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-27\">4. API\u30ec\u30fc\u30c8\u30ea\u30df\u30c3\u30c8\u5236\u5fa1<\/h3>\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 RateLimiter\n  def self.with_limit(key, limit: 100, period: 1.hour)\n    current_count = Redis.current.get(key).to_i\n\n    if current_count &lt; limit\n      Redis.current.incr(key)\n      Redis.current.expire(key, period.to_i)\n      yield\n    else\n      raise \"Rate limit exceeded\"\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">5. \u8a8d\u8a3c\u30b9\u30b3\u30fc\u30d7<\/h3>\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=\"\">module Authentication\n  def with_user_scope\n    Current.user = User.find(session[:user_id])\n    yield\n  ensure\n    Current.user = nil\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-29\">6. \u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u30e9\u30c3\u30d1\u30fc<\/h3>\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=\"\">module ErrorHandler\n  def handle_errors\n    yield\n  rescue ActiveRecord::RecordNotFound =&gt; e\n    render json: { error: \"Not Found\" }, status: :not_found\n  rescue ActiveRecord::RecordInvalid =&gt; e\n    render json: { errors: e.record.errors }, status: :unprocessable_entity\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-30\">7. \u30e1\u30fc\u30eb\u9001\u4fe1\u30e9\u30c3\u30d1\u30fc<\/h3>\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 MailerWrapper\n  def self.with_delivery_tracking\n    start_time = Time.current\n    result = yield\n\n    DeliveryLog.create!(\n      duration: Time.current - start_time,\n      success: true\n    )\n\n    result\n  rescue =&gt; e\n    DeliveryLog.create!(\n      duration: Time.current - start_time,\n      success: false,\n      error: e.message\n    )\n    raise\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-31\">8. \u30d0\u30c3\u30c1\u51e6\u7406\u30e9\u30c3\u30d1\u30fc<\/h3>\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=\"\">module BatchProcessor\n  def self.process\n    start_time = Time.current\n\n    Rails.logger.info \"Batch started at #{start_time}\"\n    result = yield\n    Rails.logger.info \"Batch completed in #{Time.current - start_time} seconds\"\n\n    result\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-32\">9. \u30bb\u30c3\u30b7\u30e7\u30f3\u7ba1\u7406<\/h3>\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 SessionManager\n  def with_temporary_session\n    old_session = session.dup\n    yield\n  ensure\n    session.replace(old_session)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-33\">10. \u30d1\u30fc\u30df\u30c3\u30b7\u30e7\u30f3\u5236\u5fa1<\/h3>\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=\"\">module Permissions\n  def with_elevated_privileges\n    original_privileges = Current.user.privileges\n    Current.user.privileges = :admin\n    yield\n  ensure\n    Current.user.privileges = original_privileges\n  end\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-34\">\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6d3b\u7528\u4f8b5\u9078<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-35\">1. CSV\u30c7\u30fc\u30bf\u51e6\u7406<\/h3>\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 CSVProcessor\n  def self.process_file(file_path)\n    require 'csv'\n\n    CSV.foreach(file_path, headers: true) do |row|\n      yield(row.to_h)\n    end\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nCSVProcessor.process_file('data.csv') do |row|\n  User.create!(row.slice('name', 'email'))\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-36\">2. \u30c7\u30fc\u30bf\u5909\u63db\u30d1\u30a4\u30d7\u30e9\u30a4\u30f3<\/h3>\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 DataPipeline\n  def self.transform(data)\n    result = data\n    result = yield(result) if block_given?\n    result\n  end\nend\n\n# \u4f7f\u7528\u4f8b\ndata = [1, 2, 3, 4, 5]\nprocessed_data = DataPipeline.transform(data) do |d|\n  d.map { |n| n * 2 }\n    .select { |n| n &gt; 5 }\n    .map { |n| n.to_s }\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-37\">3. \u30d0\u30c3\u30c1\u30c7\u30fc\u30bf\u51e6\u7406<\/h3>\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 BatchProcessor\n  def self.process_in_batches(collection, batch_size: 1000)\n    collection.find_each(batch_size: batch_size) do |item|\n      yield(item)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-38\">4. \u30c7\u30fc\u30bf\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/h3>\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=\"\">module DataFilter\n  def self.apply_filters(data)\n    filtered_data = data\n    filtered_data = yield(filtered_data) if block_given?\n    filtered_data\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-39\">5. \u30c7\u30fc\u30bf\u30a8\u30af\u30b9\u30dd\u30fc\u30c8<\/h3>\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 DataExporter\n  def self.export(format: :json)\n    data = yield\n\n    case format\n    when :json\n      JSON.generate(data)\n    when :xml\n      data.to_xml\n    when :csv\n      data.to_csv\n    end\n  end\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-40\">\u30c6\u30b9\u30c8\u5b9f\u88c5\u3067\u306e\u6d3b\u7528\u4f8b5\u9078<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-41\">1. \u30c6\u30b9\u30c8\u30d8\u30eb\u30d1\u30fc<\/h3>\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=\"\">module TestHelper\n  def with_temporary_user\n    user = User.create!(name: \"Test User\")\n    yield(user)\n  ensure\n    user.destroy\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-42\">2. \u30e2\u30c3\u30af\u5236\u5fa1<\/h3>\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=\"\">module MockController\n  def with_mocked_service\n    original_service = MyService.service_class\n    MyService.service_class = MockService\n    yield\n  ensure\n    MyService.service_class = original_service\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-43\">3. \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30ea\u30fc\u30ca\u30fc<\/h3>\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=\"\">module DatabaseCleaner\n  def self.cleaning\n    connection = ActiveRecord::Base.connection\n    connection.transaction do\n      yield\n      raise ActiveRecord::Rollback\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-44\">4. \u30c6\u30b9\u30c8\u74b0\u5883\u8a2d\u5b9a<\/h3>\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=\"\">module TestEnvironment\n  def with_modified_env\n    original_env = ENV.to_h\n    yield\n  ensure\n    ENV.replace(original_env)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-45\">5. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8<\/h3>\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=\"\">module PerformanceTest\n  def measure_performance\n    start_time = Time.current\n    memory_before = GetProcessMem.new.mb\n\n    yield\n\n    memory_after = GetProcessMem.new.mb\n    duration = Time.current - start_time\n\n    {\n      duration: duration,\n      memory_usage: memory_after - memory_before\n    }\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3059\u3050\u306b\u6d3b\u7528\u3067\u304d\u308b\u5b9f\u8df5\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002\u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u4f8b\u3092\u9078\u629e\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3059\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u306a\u958b\u767a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h1 class=\"wp-block-heading\" id=\"i-46\">yield\u3092\u4f7f\u3063\u305f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u8853<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-47\">\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u9ad8\u3081\u308byield\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-48\">1. \u5171\u901a\u51e6\u7406\u306e\u62bd\u51fa<\/h3>\n\n\n\n<p>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u524d\u306e\u30b3\u30fc\u30c9\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=\"\">def process_users\n  puts \"\u51e6\u7406\u958b\u59cb\"\n  begin\n    users = User.all\n    users.each do |user|\n      user.update_status\n    end\n  rescue =&gt; e\n    log_error(e)\n    raise\n  end\n  puts \"\u51e6\u7406\u5b8c\u4e86\"\nend\n\ndef process_orders\n  puts \"\u51e6\u7406\u958b\u59cb\"\n  begin\n    orders = Order.all\n    orders.each do |order|\n      order.calculate_total\n    end\n  rescue =&gt; e\n    log_error(e)\n    raise\n  end\n  puts \"\u51e6\u7406\u5b8c\u4e86\"\nend<\/pre>\n\n\n\n<p>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\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=\"\">def with_process_logging\n  puts \"\u51e6\u7406\u958b\u59cb\"\n  begin\n    yield\n  rescue =&gt; e\n    log_error(e)\n    raise\n  end\n  puts \"\u51e6\u7406\u5b8c\u4e86\"\nend\n\ndef process_users\n  with_process_logging do\n    User.all.each(&amp;:update_status)\n  end\nend\n\ndef process_orders\n  with_process_logging do\n    Order.all.each(&amp;:calculate_total)\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-49\">2. \u30b3\u30f3\u30c6\u30ad\u30b9\u30c8\u7ba1\u7406\u306e\u6539\u5584<\/h3>\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 ReportGenerator\n  def generate_report\n    connect_to_database\n    load_configurations\n    create_temporary_tables\n    begin\n      generate_data\n      format_data\n      save_report\n    ensure\n      cleanup_temporary_tables\n      close_database_connection\n    end\n  end\nend\n\n# \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\nclass ReportGenerator\n  def with_report_context\n    connect_to_database\n    load_configurations\n    create_temporary_tables\n    yield\n  ensure\n    cleanup_temporary_tables\n    close_database_connection\n  end\n\n  def generate_report\n    with_report_context do\n      generate_data\n      format_data\n      save_report\n    end\n  end\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-50\">\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-51\">1. \u8cac\u4efb\u306e\u5206\u96e2<\/h3>\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 UserProcessor\n  def process_user(user)\n    start_time = Time.current\n    log_start(user)\n\n    result = user.update_attributes(status: 'processing')\n\n    if result\n      log_success(user)\n    else\n      log_failure(user)\n    end\n\n    log_duration(Time.current - start_time)\n  end\nend\n\n# \u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\nclass UserProcessor\n  def with_logging\n    start_time = Time.current\n    log_start\n\n    result = yield\n\n    result ? log_success : log_failure\n    log_duration(Time.current - start_time)\n\n    result\n  end\n\n  def process_user(user)\n    with_logging { user.update_attributes(status: 'processing') }\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-52\">2. \u8a2d\u5b9a\u306e\u96c6\u4e2d\u7ba1\u7406<\/h3>\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=\"\">module ConfigurationManager\n  def with_temporary_config\n    original_config = config.dup\n    yield\n  ensure\n    self.config = original_config\n  end\n\n  def config\n    @config ||= default_config\n  end\nend\n\nclass Application\n  include ConfigurationManager\n\n  def process_with_special_config\n    with_temporary_config do\n      config.special_mode = true\n      config.timeout = 30\n      # \u51e6\u7406\u5b9f\u884c\n    end\n  end\nend<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-53\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fyield\u306e\u5b9f\u88c5\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-54\">1. \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/h3>\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\u52b9\u7387\u306e\u60aa\u3044\u5b9f\u88c5\ndef process_large_data(items)\n  processed = items.map { |item| item.process }\n  processed.each { |item| item.save }\nend\n\n# yield\u3092\u4f7f\u7528\u3057\u305f\u6700\u9069\u5316\u5b9f\u88c5\ndef process_large_data(items)\n  items.each do |item|\n    yield(item.process)\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nprocess_large_data(large_collection) do |processed_item|\n  processed_item.save\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-55\">2. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6700\u9069\u5316<\/h3>\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=\"\">module BatchProcessor\n  def self.in_batches(collection, batch_size: 1000)\n    collection.find_each(batch_size: batch_size) do |batch|\n      ActiveRecord::Base.transaction do\n        yield batch\n      end\n    end\n  end\nend\n\n# \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u3055\u308c\u305f\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u4f8b\nclass UserProcessor\n  def self.update_all_users\n    BatchProcessor.in_batches(User.active) do |user|\n      user.update_score\n      user.touch(:processed_at)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-56\">3. \u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u306e\u6700\u9069\u5316<\/h3>\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 ResourceManager\n  def self.with_resource(resource)\n    resource.acquire\n    yield resource\n  ensure\n    resource.release\n  end\nend\n\nclass DatabaseConnection\n  include ResourceManager\n\n  def execute_query\n    with_resource(connection_pool.checkout) do |conn|\n      conn.execute(yield)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-57\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u5358\u4e00\u8cac\u4efb\u306e\u539f\u5247\u3092\u5b88\u308b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u826f\u3044\u4f8b\ndef with_logging(&amp;block)\n  log_start\n  result = yield\n  log_end\n  result\nend\n\ndef with_transaction(&amp;block)\n  ActiveRecord::Base.transaction(&amp;block)\nend\n\n# \u7d44\u307f\u5408\u308f\u305b\u3066\u4f7f\u7528\nwith_logging do\n  with_transaction do\n    # \u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\n  end\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30c7\u30d5\u30a9\u30eb\u30c8\u5024\u306e\u63d0\u4f9b<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def process_with_options(options = {})\n  default_options = {\n    retry_count: 3,\n    timeout: 30\n  }\n\n  current_options = default_options.merge(options)\n  yield(current_options)\nend<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u4e00\u8cab\u6027<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">module ErrorHandler\n  def handle_errors\n    yield\n  rescue StandardError =&gt; e\n    log_error(e)\n    raise\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u30d1\u30bf\u30fc\u30f3\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u4ee5\u4e0b\u306e\u70b9\u306b\u6ce8\u610f\u3057\u3066\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8cac\u4efb\u306e\u660e\u78ba\u306a\u5206\u96e2<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u4e00\u8cab\u6027<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3078\u306e\u914d\u616e<\/li>\n\n\n\n<li>\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>yield\u3068\u306f\uff1fRuby\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/a &#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-1538","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\/1538","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=1538"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1538\/revisions"}],"predecessor-version":[{"id":1539,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1538\/revisions\/1539"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1538"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1538"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1538"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}