{"id":1270,"date":"2025-03-24T08:52:27","date_gmt":"2025-03-23T23:52:27","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1270"},"modified":"2025-03-24T08:52:27","modified_gmt":"2025-03-23T23:52:27","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby-each%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e5%9f%ba%e7%a4%8e%e3%81%8b%e3%82%89%e5%bf%9c","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1270","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Ruby each\u30e1\u30bd\u30c3\u30c9\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u57fa\u790e\u304b\u3089\u5fdc\u7528\u307e\u30677\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\">each\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u914d\u5217\u3067\u306eeach\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>      <li>        <a href=\"#i-2\">\u30cf\u30c3\u30b7\u30e5\u3067\u306eeach\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">\u30d6\u30ed\u30c3\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u6b63\u3057\u3044\u7406\u89e3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-4\">\u5b9f\u8df5\u7684\u306aeach\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-5\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u30cd\u30b9\u30c8\u3055\u308c\u305feach\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u6761\u4ef6\u5206\u5c90\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">each\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-10\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u3048\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-11\">\u3088\u304f\u3042\u308b\u30df\u30b9\u3068\u5bfe\u51e6\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-12\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u9632\u3050\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-13\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">\u4ed6\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u6bd4\u8f03<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">map\u30fbselect\u30fbreject\u3068\u306e\u4f7f\u3044\u5206\u3051<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-16\">\u3069\u3093\u306a\u6642\u306beach\u3092\u9078\u3076\u3079\u304d\u304b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-17\">\u5b9f\u52d9\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-18\">\u30c7\u30fc\u30bf\u5909\u63db\u51e6\u7406\u3067\u306e\u6d3b\u7528\u4f8b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-20\">\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">\u3088\u308a\u9ad8\u5ea6\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u624b\u6cd5\u306e\u7d39\u4ecb<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-22\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u6df1\u6398\u308a<\/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\">each\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<p>Ruby\u306eeach\u30e1\u30bd\u30c3\u30c9\u306f\u3001\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\u9806\u756a\u306b\u51e6\u7406\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u30b7\u30f3\u30d7\u30eb\u306a\u69cb\u6587\u3068\u76f4\u611f\u7684\u306a\u4f7f\u3044\u65b9\u3067\u3001\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u57fa\u672c\u3068\u306a\u308b\u91cd\u8981\u306a\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u914d\u5217\u3067\u306eeach\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u914d\u5217\u3067\u306eeach\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6700\u3082\u57fa\u672c\u7684\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u30d1\u30bf\u30fc\u30f3\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=\"\"># \u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\nnumbers = [1, 2, 3, 4, 5]\nnumbers.each do |number|\n  puts number\nend\n\n# \u51e6\u7406\u7d50\u679c\u3092\u5909\u6570\u306b\u4ee3\u5165\u3059\u308b\u5834\u5408\n# each\u306f\u5e38\u306b\u5143\u306e\u914d\u5217\u3092\u8fd4\u3059\u3053\u3068\u306b\u6ce8\u610f\nresult = numbers.each do |number|\n  puts number * 2\nend\nputs result  # =&gt; [1, 2, 3, 4, 5]\n\n# 1\u884c\u3067\u66f8\u304f\u5834\u5408\nnumbers.each { |number| puts number }\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3082\u4f7f\u7528\u3059\u308b\u5834\u5408\nnumbers.each_with_index do |number, index|\n  puts \"Index: #{index}, Value: #{number}\"\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u30cf\u30c3\u30b7\u30e5\u3067\u306eeach\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u30cf\u30c3\u30b7\u30e5\u306e\u5834\u5408\u3001\u30ad\u30fc\u3068\u5024\u306e\u4e21\u65b9\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308b\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u57fa\u672c\u7684\u306a\u30cf\u30c3\u30b7\u30e5\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\nuser = {name: \"\u7530\u4e2d\", age: 25, city: \"\u6771\u4eac\"}\n\n# \u30ad\u30fc\u3068\u5024\u306e\u4e21\u65b9\u3092\u4f7f\u7528\nuser.each do |key, value|\n  puts \"#{key}: #{value}\"\nend\n\n# \u30ad\u30fc\u3068\u5024\u3092\u30da\u30a2\u3067\u53d7\u3051\u53d6\u308b\nuser.each do |pair|\n  puts \"#{pair[0]}: #{pair[1]}\"\nend\n\n# \u30ad\u30fc\u306e\u307f\u3001\u307e\u305f\u306f\u5024\u306e\u307f\u3092\u51e6\u7406\nuser.keys.each { |key| puts key }\nuser.values.each { |value| puts value }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">\u30d6\u30ed\u30c3\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u6b63\u3057\u3044\u7406\u89e3<\/h3>\n\n\n\n<p>\u30d6\u30ed\u30c3\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u3001each\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u4e0a\u3067\u91cd\u8981\u306a\u6982\u5ff5\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=\"\"># \u5358\u4e00\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\n[1, 2, 3].each do |number|\n  # number\u306b\u306f\u5404\u8981\u7d20\u304c\u9806\u756a\u306b\u6e21\u3055\u308c\u308b\n  puts number\nend\n\n# \u8907\u6570\u306e\u30d1\u30e9\u30e1\u30fc\u30bf\uff08\u30cf\u30c3\u30b7\u30e5\u306e\u5834\u5408\uff09\n{a: 1, b: 2}.each do |key, value|\n  # key, value\u306b\u305d\u308c\u305e\u308c\u306e\u5024\u304c\u6e21\u3055\u308c\u308b\n  puts \"#{key} =&gt; #{value}\"\nend\n\n# \u30d6\u30ed\u30c3\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u30b9\u30b3\u30fc\u30d7\ntotal = 0\n[1, 2, 3].each do |number|\n  # \u30d6\u30ed\u30c3\u30af\u5185\u304b\u3089\u30d6\u30ed\u30c3\u30af\u5916\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\n  total += number\nend\nputs total  # =&gt; 6<\/pre>\n\n\n\n<p>\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>each\u30e1\u30bd\u30c3\u30c9\u306f\u5e38\u306b\u5143\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u8fd4\u3057\u307e\u3059<\/li>\n\n\n\n<li>\u30d6\u30ed\u30c3\u30af\u5185\u3067\u306e\u51e6\u7406\u306f\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u9806\u756a\u306b\u5b9f\u884c\u3055\u308c\u307e\u3059<\/li>\n\n\n\n<li>\u30d6\u30ed\u30c3\u30af\u30d1\u30e9\u30e1\u30fc\u30bf\u306e\u540d\u524d\u306f\u81ea\u7531\u306b\u8a2d\u5b9a\u3067\u304d\u307e\u3059<\/li>\n\n\n\n<li>\u30d6\u30ed\u30c3\u30af\u5185\u304b\u3089\u30d6\u30ed\u30c3\u30af\u5916\u306e\u5909\u6570\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u307e\u3059<\/li>\n<\/ul>\n\n\n\n<p>\u6ce8\u610f\u4e8b\u9805\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>each\u30e1\u30bd\u30c3\u30c9\u306f\u975e\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u3067\u3059\uff08\u5143\u306e\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\uff09<\/li>\n\n\n\n<li>\u623b\u308a\u5024\u306f\u5e38\u306b\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u306a\u308a\u307e\u3059<\/li>\n\n\n\n<li>\u8981\u7d20\u306e\u5909\u66f4\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001map\/collect\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3057\u3066\u304f\u3060\u3055\u3044<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3059\u308b\u5834\u5408\u306f\u3001\u51e6\u7406\u5185\u5bb9\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3092\u9078\u629e\u3057\u3066\u304f\u3060\u3055\u3044<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306a\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u51e6\u7406\u3084\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u3078\u3068\u9032\u3080\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-4\">\u5b9f\u8df5\u7684\u306aeach\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/h2>\n\n\n\n<p>each\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u3092\u7406\u89e3\u3057\u305f\u3089\u3001\u3088\u308a\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\u3092\u5b66\u3073\u307e\u3057\u3087\u3046\u3002\u3053\u3053\u3067\u306f\u3001\u5b9f\u52d9\u3067\u3088\u304f\u4f7f\u7528\u3055\u308c\u308b\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3<\/h3>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u67d4\u8edf\u306a\u51e6\u7406\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># each_with_index\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u51e6\u7406\nusers = [\"\u7530\u4e2d\", \"\u4f50\u85e4\", \"\u9234\u6728\"]\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u3063\u305f\u6761\u4ef6\u5206\u5c90\nusers.each_with_index do |user, index|\n  if index.even?\n    puts \"#{index}: #{user}\u3055\u3093\uff08VIP\u30e1\u30f3\u30d0\u30fc\uff09\"\n  else\n    puts \"#{index}: #{user}\u3055\u3093\"\n  end\nend\n\n# \u914d\u5217\u306e\u5909\u63db\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\nformatted_users = []\nusers.each_with_index do |user, index|\n  formatted_users &lt;&lt; {\n    id: index + 1,\n    name: user,\n    rank: index &lt; 2 ? \"\u4e0a\u7d1a\" : \"\u4e00\u822c\"\n  }\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u30cd\u30b9\u30c8\u3055\u308c\u305feach\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>\u8907\u6570\u306e\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u51e6\u7406\u3082\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u4e8c\u6b21\u5143\u914d\u5217\u306e\u51e6\u7406\nmatrix = [\n  [1, 2, 3],\n  [4, 5, 6],\n  [7, 8, 9]\n]\n\nmatrix.each do |row|\n  row.each do |element|\n    print \"#{element} \"  # \u5404\u8981\u7d20\u3092\u6a2a\u306b\u8868\u793a\n  end\n  puts  # \u884c\u306e\u7d42\u308f\u308a\u3067\u6539\u884c\nend\n\n# \u95a2\u9023\u30c7\u30fc\u30bf\u306e\u7d50\u5408\nusers = [\"\u7530\u4e2d\", \"\u4f50\u85e4\"]\nitems = [\"PC\", \"\u30b9\u30de\u30fc\u30c8\u30d5\u30a9\u30f3\"]\nprices = [80000, 50000]\n\nusers.each do |user|\n  items.each_with_index do |item, index|\n    puts \"#{user}\u3055\u3093\u306e#{item}\u306e\u4fa1\u683c: #{prices[index]}\u5186\"\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u6761\u4ef6\u5206\u5c90\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u30b3\u30fc\u30c9\u3067\u306f\u3001\u6761\u4ef6\u5206\u5c90\u3068each\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u304c\u591a\u304f\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u6761\u4ef6\u4ed8\u304d\u306e\u51e6\u7406\nnumbers = [1, 2, 3, 4, 5]\ntotal = 0\ncount = 0\n\nnumbers.each do |num|\n  # \u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u306e\u307f\u51e6\u7406\n  if num.even?\n    total += num\n    count += 1\n  end\nend\n\naverage = count &gt; 0 ? total \/ count.to_f : 0\nputs \"\u5076\u6570\u306e\u5e73\u5747: #{average}\"\n\n# \u4f8b\u5916\u51e6\u7406\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\nusers = [{name: \"\u7530\u4e2d\"}, {name: \"\u4f50\u85e4\"}, {}]\n\nusers.each do |user|\n  begin\n    puts user.fetch(:name)\n  rescue KeyError\n    puts \"\u540d\u524d\u304c\u8a2d\u5b9a\u3055\u308c\u3066\u3044\u306a\u3044\u30e6\u30fc\u30b6\u30fc\u304c\u3044\u307e\u3059\"\n  end\nend\n\n# break\/next\/redo\u306e\u6d3b\u7528\nnumbers = [1, 2, 3, 4, 5]\nnumbers.each do |num|\n  next if num.even?  # \u5076\u6570\u3092\u30b9\u30ad\u30c3\u30d7\n  break if num &gt; 4   # 4\u3088\u308a\u5927\u304d\u3044\u5834\u5408\u306b\u7d42\u4e86\n  puts num\nend<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f1\u304b\u3089\u59cb\u3081\u305f\u3044\u5834\u5408\u304c\u591a\u3044\u305f\u3081\u3001<code>index + 1<\/code>\u306e\u4f7f\u7528\u3092\u691c\u8a0e<\/li>\n\n\n\n<li>\u30cd\u30b9\u30c8\u304c\u6df1\u304f\u306a\u308a\u3059\u304e\u306a\u3044\u3088\u3046\u6ce8\u610f\uff082\u5c64\u307e\u3067\u63a8\u5968\uff09<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u51e6\u7406\u3059\u308b\u5834\u5408\u306f\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306b\u6ce8\u610f<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u4f8b\u5916\u51e6\u7406\u3092\u7d44\u307f\u8fbc\u3080<\/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\u3088\u308a\u67d4\u8edf\u3067\u5805\u7262\u306a\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5b9f\u52d9\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\u3092\u30d9\u30fc\u30b9\u306b\u3001\u3055\u3089\u306b\u8907\u96d1\u306a\u51e6\u7406\u3092\u5b9f\u88c5\u3057\u3066\u3044\u304f\u3053\u3068\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">each\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/h2>\n\n\n\n<p>\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u3084\u5b9f\u52d9\u3067\u306e\u5229\u7528\u306b\u304a\u3044\u3066\u3001each\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u9069\u5207\u306a\u4f7f\u7528\u65b9\u6cd5\u3092\u77e5\u308b\u3053\u3068\u3067\u3001\u51e6\u7406\u901f\u5ea6\u3068\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u5927\u5e45\u306b\u6539\u5584\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u969b\u306f\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068CPU\u8ca0\u8377\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=\"\"># \u30e1\u30e2\u30ea\u3092\u5927\u91cf\u306b\u6d88\u8cbb\u3059\u308b\u4f8b\nlarge_array = (1..1_000_000).to_a\nresult = []\n\n# \u975e\u52b9\u7387\u306a\u51e6\u7406\nlarge_array.each do |num|\n  result &lt;&lt; num * 2  # \u30e1\u30e2\u30ea\u3092\u5927\u91cf\u306b\u6d88\u8cbb\nend\n\n# \u3088\u308a\u52b9\u7387\u7684\u306a\u51e6\u7406\uff08Enumerator\u3092\u4f7f\u7528\uff09\nlarge_array.each.lazy.map { |num| num * 2 }.first(10)\n\n# \u30d0\u30c3\u30c1\u51e6\u7406\u306b\u3088\u308b\u6700\u9069\u5316\nlarge_array.each_slice(1000) do |batch|\n  # 1000\u4ef6\u305a\u3064\u51e6\u7406\n  batch.each do |num|\n    process_number(num)\n  end\nend\n\n# \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30ec\u30b3\u30fc\u30c9\u306e\u51e6\u7406\nUser.find_each do |user|  # find_each\u306f\u5185\u90e8\u3067\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u884c\u3046\n  user.update_status\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6291\u3048\u308b\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u4f7f\u7528\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u3044\u304f\u3064\u304b\u7d39\u4ecb\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=\"\"># \u30d5\u30a1\u30a4\u30eb\u51e6\u7406\u306e\u6700\u9069\u5316\n# \u60aa\u3044\u4f8b\uff1a\u30d5\u30a1\u30a4\u30eb\u5168\u4f53\u3092\u30e1\u30e2\u30ea\u306b\u8aad\u307f\u8fbc\u3080\nFile.read(\"large_file.txt\").each_line do |line|\n  process_line(line)\nend\n\n# \u826f\u3044\u4f8b\uff1a1\u884c\u305a\u3064\u51e6\u7406\nFile.open(\"large_file.txt\") do |file|\n  file.each_line do |line|\n    process_line(line)\n  end\nend\n\n# Enumerator\u3092\u6d3b\u7528\u3057\u305f\u6700\u9069\u5316\n# \u30ab\u30b9\u30bf\u30e0Enumerator\u306e\u4f5c\u6210\ndef custom_numbers\n  Enumerator.new do |yielder|\n    num = 0\n    loop do\n      yielder &lt;&lt; num\n      num += 1\n    end\n  end\nend\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u7121\u9650\u6570\u5217\u306e\u51e6\u7406\nnumbers = custom_numbers\nnumbers.each do |num|\n  break if num &gt; 10\n  puts num\nend\n\n# GC.start\u306e\u6226\u7565\u7684\u306a\u4f7f\u7528\nlarge_array.each_slice(1000) do |batch|\n  process_batch(batch)\n  GC.start if needed?  # \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306b\u5fdc\u3058\u3066\u9069\u5207\u306bGC\u3092\u5b9f\u884c\nend<\/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>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u524a\u6e1b<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5927\u304d\u306a\u914d\u5217\u306e\u751f\u6210\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u6d3b\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066GC\u3092\u5b9f\u884c\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u51e6\u7406\u901f\u5ea6\u306e\u6539\u5584<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u8981\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u751f\u6210\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30c1\u30b5\u30a4\u30ba\u3092\u9078\u629e\u3059\u308b<\/li>\n\n\n\n<li>Enumerator\u3092\u6d3b\u7528\u3059\u308b<\/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\u30cf\u30f3\u30c9\u30eb\u3092\u9069\u5207\u306b\u30af\u30ed\u30fc\u30ba\u3059\u308b<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050<\/li>\n\n\n\n<li>\u5927\u304d\u306a\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u907f\u3051\u308b<\/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\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u3082\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u7dad\u6301\u3057\u306a\u304c\u3089\u5b89\u5b9a\u3057\u305f\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-11\">\u3088\u304f\u3042\u308b\u30df\u30b9\u3068\u5bfe\u51e6\u6cd5<\/h2>\n\n\n\n<p>each\u30e1\u30bd\u30c3\u30c9\u306f\u76f4\u611f\u7684\u306b\u4f7f\u3048\u308b\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u601d\u308f\u306c\u30d0\u30b0\u3084\u6027\u80fd\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u3053\u3068\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u3088\u304f\u3042\u308b\u30df\u30b9\u3068\u305d\u306e\u5bfe\u51e6\u6cd5\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u9632\u3050\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u7121\u9650\u30eb\u30fc\u30d7\u306f\u3001\u7279\u306b\u518d\u5e30\u7684\u306a\u51e6\u7406\u3084\u52d5\u7684\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u6642\u306b\u767a\u751f\u3057\u3084\u3059\u3044\u554f\u984c\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=\"\"># \u5371\u967a\u306a\u4f8b\uff1a\u51e6\u7406\u4e2d\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u5909\u66f4\nnumbers = [1, 2, 3]\nnumbers.each do |num|\n  numbers &lt;&lt; num * 2  # \u7121\u9650\u30eb\u30fc\u30d7\u306e\u539f\u56e0\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\u65b9\u6cd5\nnumbers = [1, 2, 3]\nnew_numbers = []\nnumbers.each do |num|\n  new_numbers &lt;&lt; num * 2\nend\n\n# \u518d\u5e30\u7684\u306a\u51e6\u7406\u3067\u306e\u7121\u9650\u30eb\u30fc\u30d7\u9632\u6b62\ndef process_tree(node, depth = 0)\n  return if depth &gt; 10  # \u6700\u5927\u6df1\u5ea6\u3092\u8a2d\u5b9a\n\n  node.children.each do |child|\n    process_tree(child, depth + 1)\n  end\nend\n\n# \u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u9069\u5207\u306a\u7d42\u4e86\u6761\u4ef6\ncounter = 0\nloop do\n  break if counter &gt;= 10  # \u660e\u793a\u7684\u306a\u7d42\u4e86\u6761\u4ef6\n  counter += 1\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306f\u3001\u7279\u306b\u9577\u6642\u9593\u7a3c\u50cd\u3059\u308b\u30d7\u30ed\u30bb\u30b9\u3067\u6df1\u523b\u306a\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u53ef\u80fd\u6027\u304c\u3042\u308b\u5b9f\u88c5\nclass DataProcessor\n  def process_large_data\n    @cache = []\n    large_data = get_large_data()\n\n    large_data.each do |item|\n      @cache &lt;&lt; process_item(item)  # \u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u969b\u9650\u306a\u304f\u5897\u52a0\n    end\n  end\nend\n\n# \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\nclass DataProcessor\n  def process_large_data\n    large_data = get_large_data()\n\n    large_data.each do |item|\n      result = process_item(item)\n      yield result if block_given?  # \u7d50\u679c\u3092\u9010\u6b21\u7684\u306b\u6e21\u3059\n    end\n  end\nend\n\n# \u30ea\u30bd\u30fc\u30b9\u306e\u9069\u5207\u306a\u89e3\u653e\nfile_paths.each do |path|\n  File.open(path) do |file|  # \u30d6\u30ed\u30c3\u30af\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u81ea\u52d5\u30af\u30ed\u30fc\u30ba\n    process_file(file)\n  end  # \u30d5\u30a1\u30a4\u30eb\u306f\u81ea\u52d5\u7684\u306b\u30af\u30ed\u30fc\u30ba\u3055\u308c\u308b\nend\n\n# \u5927\u304d\u306a\u914d\u5217\u306e\u89e3\u653e\ndef process_chunks\n  results = []\n  large_array.each_slice(1000) do |chunk|\n    results.concat(process_chunk(chunk))\n    chunk.clear  # \u4e0d\u8981\u306b\u306a\u3063\u305f\u30c1\u30e3\u30f3\u30af\u3092\u660e\u793a\u7684\u306b\u89e3\u653e\n  end\n  results\nend<\/pre>\n\n\n\n<p>\u4e3b\u306a\u6ce8\u610f\u70b9\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u7121\u9650\u30eb\u30fc\u30d7\u306e\u9632\u6b62<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u4e2d\u306e\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5909\u66f4\u3092\u907f\u3051\u308b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u7d42\u4e86\u6761\u4ef6\u3092\u8a2d\u5b9a\u3059\u308b<\/li>\n\n\n\n<li>\u518d\u5e30\u306e\u6df1\u3055\u3092\u5236\u9650\u3059\u308b<\/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\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306f\u4f7f\u7528\u5f8c\u306b\u89e3\u653e<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u306f\u30b5\u30a4\u30ba\u5236\u9650\u3092\u8a2d\u3051\u308b<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u306f\u9069\u5207\u306b\u30af\u30ed\u30fc\u30ba\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30d0\u30c3\u30b0\u306e\u30b3\u30c4<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>puts\/p\/pp\u3092\u4f7f\u7528\u3057\u3066\u9014\u4e2d\u7d4c\u904e\u3092\u78ba\u8a8d<\/li>\n\n\n\n<li>\u554f\u984c\u306e\u5207\u308a\u5206\u3051\u3092\u9069\u5207\u306b\u884c\u3046<\/li>\n\n\n\n<li>\u518d\u73fe\u53ef\u80fd\u306a\u6700\u5c0f\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u4f5c\u6210<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u554f\u984c\u306b\u9069\u5207\u306b\u5bfe\u51e6\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5b9a\u3057\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">\u4ed6\u306e\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u6bd4\u8f03<\/h2>\n\n\n\n<p>each\u30e1\u30bd\u30c3\u30c9\u306f\u57fa\u672c\u7684\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001Ruby\u306b\u306f\u4ed6\u306b\u3082\u591a\u304f\u306e\u4fbf\u5229\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u305d\u308c\u305e\u308c\u306e\u7279\u5fb4\u3068\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">map\u30fbselect\u30fbreject\u3068\u306e\u4f7f\u3044\u5206\u3051<\/h3>\n\n\n\n<p>\u4e3b\u8981\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u3092\u6bd4\u8f03\u3057\u3066\u307f\u307e\u3057\u3087\u3046\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=\"\">numbers = [1, 2, 3, 4, 5]\n\n# each: \u8981\u7d20\u3092\u9806\u306b\u51e6\u7406\uff08\u623b\u308a\u5024\u306f\u5143\u306e\u914d\u5217\uff09\nresult_each = numbers.each do |n|\n  n * 2\nend\nputs result_each  # =&gt; [1, 2, 3, 4, 5]\n\n# map: \u65b0\u3057\u3044\u914d\u5217\u3092\u751f\u6210\uff08\u5404\u8981\u7d20\u3092\u5909\u63db\uff09\nresult_map = numbers.map do |n|\n  n * 2\nend\nputs result_map  # =&gt; [2, 4, 6, 8, 10]\n\n# select: \u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\nresult_select = numbers.select do |n|\n  n.even?\nend\nputs result_select  # =&gt; [2, 4]\n\n# reject: \u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u9664\u5916\nresult_reject = numbers.reject do |n|\n  n.even?\nend\nputs result_reject  # =&gt; [1, 3, 5]\n\n# \u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u5206\u3051\u4f8b\nusers = [\n  {name: \"\u7530\u4e2d\", age: 25},\n  {name: \"\u4f50\u85e4\", age: 30},\n  {name: \"\u9234\u6728\", age: 20}\n]\n\n# each: \u526f\u4f5c\u7528\u3092\u4f34\u3046\u51e6\u7406\nusers.each { |user| puts \"#{user[:name]}\u3055\u3093\" }\n\n# map: \u30c7\u30fc\u30bf\u5909\u63db\nadult_names = users.map { |user| user[:name] if user[:age] &gt;= 20 }.compact\n\n# select: \u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nadults = users.select { |user| user[:age] &gt;= 20 }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u3069\u3093\u306a\u6642\u306beach\u3092\u9078\u3076\u3079\u304d\u304b<\/h3>\n\n\n\n<p>\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># each\u304c\u9069\u3057\u3066\u3044\u308b\u4f8b\uff1a\n# 1. \u526f\u4f5c\u7528\u3092\u4f34\u3046\u51e6\u7406\nrecords.each { |record| record.save! }\n\n# 2. \u8907\u6570\u306e\u6761\u4ef6\u5206\u5c90\u304c\u3042\u308b\u51e6\u7406\nusers.each do |user|\n  case user.status\n  when 'active'\n    process_active_user(user)\n  when 'inactive'\n    process_inactive_user(user)\n  else\n    process_pending_user(user)\n  end\nend\n\n# map\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u4f8b\uff1a\n# \u5909\u63db\u51e6\u7406\nnumbers.map { |n| n * 2 }  # each + \u914d\u5217\u8ffd\u52a0\u3088\u308a\u3082\u7c21\u6f54\n\n# select\u306e\u65b9\u304c\u9069\u3057\u3066\u3044\u308b\u4f8b\uff1a\n# \u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nnumbers.select { |n| n.even? }  # each + \u6761\u4ef6\u5224\u5b9a + \u914d\u5217\u8ffd\u52a0\u3088\u308a\u3082\u7c21\u6f54<\/pre>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u9078\u629e\u306e\u6307\u91dd\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>each\u3092\u9078\u3076\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u526f\u4f5c\u7528\u3092\u4f34\u3046\u51e6\u7406\uff08\u30d5\u30a1\u30a4\u30eb\u51fa\u529b\u3001DB\u306e\u66f4\u65b0\u306a\u3069\uff09<\/li>\n\n\n\n<li>\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90\u3092\u542b\u3080\u51e6\u7406<\/li>\n\n\n\n<li>\u5143\u306e\u914d\u5217\u3092\u5909\u66f4\u3057\u306a\u3044\u51e6\u7406<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u9078\u3076\u5834\u5408<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>map: \u30c7\u30fc\u30bf\u5909\u63db\u304c\u76ee\u7684<\/li>\n\n\n\n<li>select\/reject: \u6761\u4ef6\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u304c\u76ee\u7684<\/li>\n\n\n\n<li>reduce: \u8981\u7d20\u306e\u96c6\u8a08\u304c\u76ee\u7684<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u9069\u5207\u306b\u4f7f\u3044\u5206\u3051\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8aad\u307f\u3084\u3059\u304f\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3057\u3084\u3059\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-17\">\u5b9f\u52d9\u3067\u306e\u6d3b\u7528\u4e8b\u4f8b<\/h2>\n\n\n\n<p>\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067each\u30e1\u30bd\u30c3\u30c9\u304c\u3069\u306e\u3088\u3046\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u3001\u5177\u4f53\u7684\u306a\u6d3b\u7528\u4e8b\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30c7\u30fc\u30bf\u5909\u63db\u51e6\u7406\u3067\u306e\u6d3b\u7528\u4f8b<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u306f\u3001\u7570\u306a\u308b\u30d5\u30a9\u30fc\u30de\u30c3\u30c8\u9593\u3067\u306e\u30c7\u30fc\u30bf\u5909\u63db\u304c\u983b\u7e41\u306b\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># CSV\u30c7\u30fc\u30bf\u306e\u51e6\u7406\u4f8b\nrequire 'csv'\n\nclass DataConverter\n  def convert_csv_to_json(csv_path)\n    results = []\n    CSV.foreach(csv_path, headers: true) do |row|\n      results &lt;&lt; {\n        id: row['id'],\n        name: row['name'],\n        email: row['email']\n      }\n    end\n    results.to_json\n  end\nend\n\n# API\u30ec\u30b9\u30dd\u30f3\u30b9\u306e\u5909\u63db\u4f8b\nclass APIResponseFormatter\n  def format_user_data(raw_data)\n    formatted_data = []\n\n    raw_data.each do |user|\n      formatted_data &lt;&lt; {\n        user_id: user[:id],\n        full_name: \"#{user[:first_name]} #{user[:last_name]}\",\n        contact: {\n          email: user[:email],\n          phone: format_phone_number(user[:phone])\n        }\n      }\n    rescue StandardError =&gt; e\n      Rails.logger.error(\"\u30c7\u30fc\u30bf\u5909\u63db\u30a8\u30e9\u30fc: #{e.message}\")\n      next\n    end\n\n    formatted_data\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u5927\u91cf\u30c7\u30fc\u30bf\u306e\u51e6\u7406\u3084\u5b9a\u671f\u7684\u306a\u30c7\u30fc\u30bf\u66f4\u65b0\u306a\u3069\u306e\u30d0\u30c3\u30c1\u51e6\u7406\u3067\u3082\u3001each\u30e1\u30bd\u30c3\u30c9\u306f\u6d3b\u8e8d\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BatchProcessor\n  def process_orders(orders)\n    success_count = 0\n    error_count = 0\n\n    orders.find_each do |order|  # find_each\u3067\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u6539\u5584\n      ActiveRecord::Base.transaction do\n        begin\n          process_single_order(order)\n          success_count += 1\n        rescue =&gt; e\n          error_count += 1\n          log_error(order, e)\n          next\n        end\n      end\n    end\n\n    {\n      total: orders.count,\n      success: success_count,\n      error: error_count\n    }\n  end\n\n  private\n\n  def process_single_order(order)\n    # \u6ce8\u6587\u51e6\u7406\u306e\u30ed\u30b8\u30c3\u30af\n    order.update!(status: 'processed')\n    notify_customer(order)\n    update_inventory(order)\n  end\nend\n\n# \u5728\u5eab\u66f4\u65b0\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u4f8b\nclass InventoryUpdater\n  def update_stock_levels\n    Product.find_each.with_index do |product, index|\n      begin\n        current_stock = calculate_current_stock(product)\n        product.update!(stock_level: current_stock)\n\n        # 100\u4ef6\u3054\u3068\u306b\u30ed\u30b0\u3092\u51fa\u529b\n        log_progress(index) if (index + 1) % 100 == 0\n      rescue =&gt; e\n        Rails.logger.error(\"\u5728\u5eab\u66f4\u65b0\u30a8\u30e9\u30fc - \u5546\u54c1ID: #{product.id}, \u30a8\u30e9\u30fc: #{e.message}\")\n        next\n      end\n    end\n  end\nend<\/pre>\n\n\n\n<p>\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u5909\u63db\u51e6\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\u306e\u8ffd\u52a0<\/li>\n\n\n\n<li>\u30ed\u30b0\u51fa\u529b\u306e\u9069\u5207\u306a\u914d\u7f6e<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d0\u30c3\u30c1\u51e6\u7406<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u7ba1\u7406<\/li>\n\n\n\n<li>\u9032\u6357\u72b6\u6cc1\u306e\u76e3\u8996<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u6642\u306e\u7d99\u7d9a\u51e6\u7406<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u5b9f\u52d9\u3067\u306e\u57fa\u672c\u7684\u306a\u8a2d\u8a08\u6307\u91dd\u3068\u306a\u308a\u3001\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u30ab\u30b9\u30bf\u30de\u30a4\u30ba\u3057\u3066\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">\u6b21\u306e\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n\n\n<p>each\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u304b\u3089\u5b9f\u8df5\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\u307e\u3067\u7406\u89e3\u3057\u305f\u3068\u3053\u308d\u3067\u3001\u3055\u3089\u306a\u308b\u6280\u8853\u5411\u4e0a\u306e\u305f\u3081\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u3088\u308a\u9ad8\u5ea6\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u624b\u6cd5\u306e\u7d39\u4ecb<\/h3>\n\n\n\n<p>Ruby\u306b\u306f\u3001\u3088\u308a\u9ad8\u5ea6\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u51e6\u7406\u306e\u305f\u3081\u306e\u6a5f\u80fd\u304c\u7528\u610f\u3055\u308c\u3066\u3044\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=\"\"># Enumerator\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u5236\u5fa1\n# \u30ab\u30b9\u30bf\u30e0\u30a4\u30c6\u30ec\u30fc\u30bf\u306e\u4f5c\u6210\ndef custom_iterator\n  Enumerator.new do |yielder|\n    count = 0\n    loop do\n      yielder &lt;&lt; \"item-#{count}\"\n      count += 1\n    end\n  end\nend\n\niterator = custom_iterator\n5.times { puts iterator.next }  # item-0\u304b\u3089item-4\u307e\u3067\u51fa\u529b\n\n# Enumerator::Lazy\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u51e6\u7406\n# \u7121\u9650\u6570\u5217\u304b\u3089\u6761\u4ef6\u306b\u5408\u3046\u5024\u3060\u3051\u3092\u52b9\u7387\u7684\u306b\u53d6\u5f97\ninfinite_numbers = (1..Float::INFINITY).lazy\n  .select { |n| n % 3 == 0 }  # 3\u306e\u500d\u6570\u3092\u9078\u629e\n  .map { |n| n * 2 }          # 2\u500d\u3059\u308b\n  .first(5)                   # \u6700\u521d\u306e5\u3064\u3092\u53d6\u5f97\n\n# Fiber\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u5236\u5fa1\nfibonacci = Fiber.new do\n  a, b = 0, 1\n  loop do\n    Fiber.yield(a)\n    a, b = b, a + b\n  end\nend\n\n5.times { puts fibonacci.resume }  # \u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u5217\u306e\u6700\u521d\u306e5\u3064\u3092\u51fa\u529b<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-22\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u6df1\u6398\u308a<\/h3>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316\u306b\u306f\u3001\u3088\u308a\u6df1\u3044\u7406\u89e3\u3068\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\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=\"\"># \u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u4f7f\u7528\u3057\u305f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\nrequire 'benchmark'\n\narray = (1..10000).to_a\n\nBenchmark.bm do |x|\n  # \u901a\u5e38\u306eeach\n  x.report(\"each:\") do\n    result = []\n    array.each { |n| result &lt;&lt; n * 2 }\n  end\n\n  # map\u3092\u4f7f\u7528\n  x.report(\"map:\") { array.map { |n| n * 2 } }\n\n  # each_with_object\u3092\u4f7f\u7528\n  x.report(\"each_with_object:\") do\n    array.each_with_object([]) { |n, result| result &lt;&lt; n * 2 }\n  end\nend\n\n# \u30e1\u30e2\u30ea\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0\u306e\u4f8b\nrequire 'memory_profiler'\n\nreport = MemoryProfiler.report do\n  # \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8a08\u6e2c\u3057\u305f\u3044\u30b3\u30fc\u30c9\n  large_array = (1..10000).to_a\n  large_array.each { |n| n * 2 }\nend\n\nreport.pretty_print\n\n# \u3088\u308a\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\nclass EfficientProcessor\n  # \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\n  def process_large_data(data)\n    data.each_slice(1000).map do |chunk|\n      process_chunk(chunk)\n    end.flatten\n  end\n\n  # \u4e26\u5217\u51e6\u7406\u306e\u5b9f\u88c5\n  def parallel_process(data)\n    require 'parallel'\n\n    Parallel.map(data.each_slice(1000).to_a) do |chunk|\n      process_chunk(chunk)\n    end.flatten\n  end\nend<\/pre>\n\n\n\n<p>\u767a\u5c55\u7684\u306a\u5b66\u7fd2\u306e\u30dd\u30a4\u30f3\u30c8\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9ad8\u5ea6\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u6280\u8853<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Enumerator\/Enumerator::Lazy<\/li>\n\n\n\n<li>Fiber<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30a4\u30c6\u30ec\u30fc\u30bf<\/li>\n\n\n\n<li>\u95a2\u6570\u578b\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u7684\u30a2\u30d7\u30ed\u30fc\u30c1<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/li>\n<\/ol>\n\n\n\n<ul 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