{"id":1332,"date":"2025-03-24T08:52:20","date_gmt":"2025-03-23T23:52:20","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1332"},"modified":"2025-03-24T08:52:20","modified_gmt":"2025-03-23T23:52:20","slug":"%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby%e3%81%ae%e3%83%ab%e3%83%bc%e3%83%97%e5%87%a6%e7%90%86%e5%ae%8c%e5%85%a8%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%ef%bc%81%e4%bd%bf%e3%81%84%e5%88%86%e3%81%91","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1332","title":{"rendered":"\u4fdd\u5b58\u7248\u3011Ruby\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u4f7f\u3044\u5206\u3051\u304b\u3089\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u307e\u3067\u89e3\u8aac"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">Ruby\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u3092\u51e6\u7406\u3059\u308b\u969b\u306b\u306a\u305c\u30eb\u30fc\u30d7\u304c\u5fc5\u8981\u306a\u306e\u304b<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">Ruby\u304c\u63d0\u4f9b\u3059\u308b4\u3064\u306e\u57fa\u672c\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u7279\u5fb4<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">each\u3001map\u3001times\u3001loop\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u4f7f\u3044\u5206\u3051<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u914d\u5217\u3092\u51e6\u7406\u3059\u308beach\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u3068\u57fa\u672c\u69cb\u6587<\/a>      <\/li>      <li>        <a href=\"#i-5\">\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\u3059\u308bmap\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-6\">\u6307\u5b9a\u56de\u6570\u5b9f\u884c\u3059\u308btimes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u3069\u3053\u308d<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u5236\u5fa1\u3059\u308bloop\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-8\">\u5b9f\u8df5\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u30c6\u30af\u30cb\u30c3\u30af\u96c6<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-9\">\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30eb\u30fc\u30d7\u3092\u8aad\u307f\u3084\u3059\u304f\u66f8\u304f\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-10\">break\u3068next\u3092\u4f7f\u3063\u305f\u5236\u5fa1\u30d5\u30ed\u30fc\u306e\u6700\u9069\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-11\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u30eb\u30fc\u30d7\u3067\u4f4d\u7f6e\u60c5\u5831\u3092\u6d3b\u7528\u3059\u308b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u5b9f\u88c5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-13\">each vs map\uff1a\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u5b9f\u884c\u901f\u5ea6\u306e\u6bd4\u8f03<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u30eb\u30fc\u30d7\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u4e0d\u8981\u306a\u30eb\u30fc\u30d7\u3092\u6e1b\u3089\u3059\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-16\">\u3088\u304f\u3042\u308b\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u89e3\u6c7a\u7b56<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u7121\u9650\u30eb\u30fc\u30d7\u306b\u9665\u3089\u306a\u3044\u305f\u3081\u306e\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>      <li>        <a href=\"#i-18\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u66f8\u304d\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-19\">\u30cd\u30b9\u30c8\u304c\u6df1\u3044\u30eb\u30fc\u30d7\u3092\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3059\u308b\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-0\">Ruby\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u3068\u306f\uff1f\u521d\u5fc3\u8005\u306b\u3082\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u3092\u51e6\u7406\u3059\u308b\u969b\u306b\u306a\u305c\u30eb\u30fc\u30d7\u304c\u5fc5\u8981\u306a\u306e\u304b<\/h3>\n\n\n\n<p>\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u306b\u304a\u3044\u3066\u3001\u30c7\u30fc\u30bf\u306e\u96c6\u5408\uff08\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\uff09\u3092\u6271\u3046\u5834\u9762\u306f\u975e\u5e38\u306b\u591a\u304f\u767a\u751f\u3057\u307e\u3059\u3002\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u3001\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u5fc5\u8981\u306b\u306a\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u30e6\u30fc\u30b6\u30fc\u306e\u4e00\u89a7\u304b\u3089\u7279\u5b9a\u306e\u6761\u4ef6\u306b\u5408\u3046\u4eba\u3092\u63a2\u3059<\/li>\n\n\n\n<li>\u5546\u54c1\u30c7\u30fc\u30bf\u3059\u3079\u3066\u306b\u6d88\u8cbb\u7a0e\u3092\u9069\u7528\u3059\u308b<\/li>\n\n\n\n<li>\u30ed\u30b0\u30d5\u30a1\u30a4\u30eb\u306e\u5404\u884c\u3092\u89e3\u6790\u3059\u308b<\/li>\n<\/ul>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u51e6\u7406\u3092<strong>\u30eb\u30fc\u30d7\u3092\u4f7f\u308f\u305a\u306b<\/strong>\u66f8\u3053\u3046\u3068\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5197\u9577\u306a\u30b3\u30fc\u30c9\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">users = [\"Alice\", \"Bob\", \"Charlie\"]\n# \u30eb\u30fc\u30d7\u3092\u4f7f\u308f\u306a\u3044\u5834\u5408\nputs users[0]\nputs users[1]\nputs users[2]<\/pre>\n\n\n\n<p>\u4e00\u65b9\u3001\u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u3068\u540c\u3058\u51e6\u7406\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">users = [\"Alice\", \"Bob\", \"Charlie\"]\n# \u30eb\u30fc\u30d7\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\nusers.each { |user| puts user }<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">Ruby\u304c\u63d0\u4f9b\u3059\u308b4\u3064\u306e\u57fa\u672c\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u7279\u5fb4<\/h3>\n\n\n\n<p>Ruby\u306b\u306f\u4e3b\u306b4\u3064\u306e\u57fa\u672c\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u304c\u3042\u308a\u3001\u305d\u308c\u305e\u308c\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>each \u30e1\u30bd\u30c3\u30c9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306e\u8981\u7d20\u3092\u9806\u756a\u306b\u51e6\u7406<\/li>\n\n\n\n<li>\u5143\u306e\u914d\u5217\u3092\u5909\u66f4\u3057\u306a\u3044<\/li>\n\n\n\n<li>\u623b\u308a\u5024\u306f\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u81ea\u8eab<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   [1, 2, 3].each { |num| puts num }  # 1, 2, 3 \u3068\u51fa\u529b<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>map \u30e1\u30bd\u30c3\u30c9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5404\u8981\u7d20\u3092\u5909\u63db\u3057\u3066\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210<\/li>\n\n\n\n<li>\u5143\u306e\u914d\u5217\u306f\u5909\u66f4\u3055\u308c\u306a\u3044<\/li>\n\n\n\n<li>\u623b\u308a\u5024\u306f\u5909\u63db\u5f8c\u306e\u65b0\u3057\u3044\u914d\u5217<\/li>\n<\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">   [1, 2, 3].map { |num| num * 2 }  # [2, 4, 6] \u3092\u8fd4\u3059<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><strong>times \u30e1\u30bd\u30c3\u30c9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6307\u5b9a\u3057\u305f\u56de\u6570\u3060\u3051\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059<\/li>\n\n\n\n<li>\u30ab\u30a6\u30f3\u30bf\u5909\u6570\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u4fbf\u5229<\/li>\n\n\n\n<li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f0\u304b\u3089\u59cb\u307e\u308b<\/li>\n<\/ul>\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=\"\">   3.times { |i| puts \"#{i}\u56de\u76ee\" }  # 0\u56de\u76ee, 1\u56de\u76ee, 2\u56de\u76ee \u3068\u51fa\u529b<\/pre>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><strong>loop \u30e1\u30bd\u30c3\u30c9<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u7121\u9650\u30eb\u30fc\u30d7\u3092\u4f5c\u6210<\/li>\n\n\n\n<li>break \u3067\u660e\u793a\u7684\u306b\u7d42\u4e86\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/li>\n\n\n\n<li>\u6761\u4ef6\u4ed8\u304d\u30eb\u30fc\u30d7\u306e\u57fa\u790e\u3068\u306a\u308b<\/li>\n<\/ul>\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=\"\">   i = 0\n   loop do\n     puts i\n     i += 1\n     break if i &gt;= 3  # i\u304c3\u4ee5\u4e0a\u306b\u306a\u3063\u305f\u3089\u7d42\u4e86\n   end<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u57fa\u6e96\u3067\u4f7f\u3044\u5206\u3051\u307e\u3059\uff1a<\/p>\n\n\n<div id=\"id-86f4bde9-eaa5-472a-9e68-c37cb6ebed31\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30eb\u30fc\u30d7\u306e\u7a2e\u985e<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><th>\u7279\u5fb4\u7684\u306a\u70b9<\/th><\/tr><\/thead><tbody><tr><td>each<\/td><td>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8d70\u67fb<\/td><td>\u8981\u7d20\u3092\u9806\u756a\u306b\u51e6\u7406\u3059\u308b\u5834\u5408\u306e\u57fa\u672c\u5f62<\/td><\/tr><tr><td>map<\/td><td>\u30c7\u30fc\u30bf\u306e\u5909\u63db<\/td><td>\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408<\/td><\/tr><tr><td>times<\/td><td>\u56de\u6570\u6307\u5b9a\u306e\u7e70\u308a\u8fd4\u3057<\/td><td>\u7279\u5b9a\u56de\u6570\u306e\u51e6\u7406\u3092\u884c\u3046\u5834\u5408<\/td><\/tr><tr><td>loop<\/td><td>\u6761\u4ef6\u4ed8\u304d\u7e70\u308a\u8fd4\u3057<\/td><td>\u7d42\u4e86\u6761\u4ef6\u304c\u52d5\u7684\u306a\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>Ruby\u306e\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u7279\u5fb4\u3068\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u70b9\u304c\u6319\u3052\u3089\u308c\u307e\u3059\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30d6\u30ed\u30c3\u30af\u69cb\u6587\u306e\u5229\u7528<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6ce2\u62ec\u5f27 <code>{}<\/code> \u3084do-end \u3067\u51e6\u7406\u3092\u30d6\u30ed\u30c3\u30af\u5316<\/li>\n\n\n\n<li>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u304c\u53ef\u80fd<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u304c\u9ad8\u3044<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30a4\u30c6\u30ec\u30fc\u30bf\u3068\u3057\u3066\u306e\u5b9f\u88c5<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5185\u90e8\u30a4\u30c6\u30ec\u30fc\u30bf\u30d1\u30bf\u30fc\u30f3\u3092\u63a1\u7528<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u3044<\/li>\n\n\n\n<li>\u51e6\u7406\u304c\u76f4\u611f\u7684<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u8c4a\u5bcc\u306a\u30e1\u30bd\u30c3\u30c9\u7fa4<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>each_with_index<\/li>\n\n\n\n<li>select\/reject<\/li>\n\n\n\n<li>reduce\/inject<br>\u306a\u3069\u3001\u76ee\u7684\u306b\u5fdc\u3058\u305f\u591a\u69d8\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">each\u3001map\u3001times\u3001loop\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u914d\u5217\u3092\u51e6\u7406\u3059\u308beach\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u3068\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p>each\u30e1\u30bd\u30c3\u30c9\u306f\u3001Ruby\u3067\u6700\u3082\u57fa\u672c\u7684\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306e\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u540c\u3058\u51e6\u7406\u3092\u884c\u3046\u969b\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u914d\u5217\u306b\u5bfe\u3059\u308beach\nfruits = ['apple', 'banana', 'orange']\nfruits.each do |fruit|\n  puts \"I love #{fruit}!\"  # \u5404\u30d5\u30eb\u30fc\u30c4\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u5b9f\u884c\nend\n\n# \u30cf\u30c3\u30b7\u30e5\u306b\u5bfe\u3059\u308beach\nscores = { 'Alice' =&gt; 90, 'Bob' =&gt; 85, 'Charlie' =&gt; 95 }\nscores.each do |name, score|\n  puts \"#{name} scored #{score} points\"  # \u30ad\u30fc\u3068\u5024\u306e\u4e21\u65b9\u3092\u4f7f\u7528\nend<\/pre>\n\n\n\n<p><strong>\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u3067\u306e\u51e6\u7406\nfruits.each_with_index do |fruit, index|\n  puts \"#{index + 1}. #{fruit}\"  # \u756a\u53f7\u4ed8\u304d\u30ea\u30b9\u30c8\u306e\u4f5c\u6210\nend\n\n# \u8907\u6570\u884c\u306e\u51e6\u7406\nusers.each do |user|\n  # \u8907\u96d1\u306a\u51e6\u7406\u3092\u8a18\u8ff0\u53ef\u80fd\n  total = user.calculate_points\n  user.update_rank\n  notify_user(user) if total &gt; 100\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-5\">\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\u3059\u308bmap\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>map\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u306e\u5404\u8981\u7d20\u3092\u5909\u63db\u3057\u3066\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\u3059\u308b\u969b\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u5143\u306e\u914d\u5217\u306f\u5909\u66f4\u3055\u308c\u307e\u305b\u3093\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u6570\u5024\u306e\u5909\u63db\nnumbers = [1, 2, 3, 4, 5]\ndoubled = numbers.map { |n| n * 2 }  # [2, 4, 6, 8, 10]\n\n# \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u5c5e\u6027\u62bd\u51fa\nusers = [user1, user2, user3]\nnames = users.map(&amp;:name)  # \u77ed\u7e2e\u8a18\u6cd5\u3067name\u30e1\u30bd\u30c3\u30c9\u3092\u547c\u3073\u51fa\u3057\n\n# \u6761\u4ef6\u4ed8\u304d\u5909\u63db\nvalues = [1, nil, 3, nil, 5]\ncleaned = values.map { |v| v || 0 }  # nil\u30920\u306b\u7f6e\u63db<\/pre>\n\n\n\n<p><strong>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u306e\u6d3b\u7528\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u8907\u6570\u306e\u5909\u63db\u3092\u9023\u7d50\nresult = numbers\n  .map { |n| n * 2 }     # 2\u500d\u306b\u3059\u308b\n  .select { |n| n &gt; 5 }  # 5\u3088\u308a\u5927\u304d\u3044\u6570\u3092\u9078\u629e\n  .map { |n| n.to_s }    # \u6587\u5b57\u5217\u306b\u5909\u63db<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">\u6307\u5b9a\u56de\u6570\u5b9f\u884c\u3059\u308btimes\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u3069\u3053\u308d<\/h3>\n\n\n\n<p>times\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u7279\u5b9a\u306e\u51e6\u7406\u3092\u6307\u5b9a\u56de\u6570\u3060\u3051\u5b9f\u884c\u3059\u308b\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30b7\u30f3\u30d7\u30eb\u306a\u7e70\u308a\u8fd4\u3057\n3.times { puts \"Hello!\" }  # Hello!\u30923\u56de\u51fa\u529b\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5229\u7528\n5.times do |i|\n  puts \"\u73fe\u5728#{i + 1}\u56de\u76ee\u306e\u51e6\u7406\u3067\u3059\"\nend\n\n# \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u751f\u6210\nusers = 3.times.map do |i|\n  User.create(\n    name: \"User#{i + 1}\",\n    email: \"user#{i + 1}@example.com\"\n  )\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u5236\u5fa1\u3059\u308bloop\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p>loop\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u308b\u307e\u3067\u51e6\u7406\u3092\u7e70\u308a\u8fd4\u3059\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u57fa\u672c\u7684\u306a\u7121\u9650\u30eb\u30fc\u30d7\ncounter = 0\nloop do\n  puts counter\n  counter += 1\n  break if counter &gt;= 5  # 5\u56de\u3067\u7d42\u4e86\nend\n\n# \u30ea\u30c8\u30e9\u30a4\u51e6\u7406\u306e\u5b9f\u88c5\nloop do\n  begin\n    response = api.fetch_data\n    process_data(response)\n    break  # \u6210\u529f\u3057\u305f\u3089\u30eb\u30fc\u30d7\u3092\u629c\u3051\u308b\n  rescue ApiError =&gt; e\n    retry_count += 1\n    break if retry_count &gt;= 3  # 3\u56de\u5931\u6557\u3057\u305f\u3089\u7d42\u4e86\n    sleep 1  # 1\u79d2\u5f85\u6a5f\u3057\u3066\u518d\u8a66\u884c\n  end\nend<\/pre>\n\n\n\n<p>\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u5206\u3051\u306e\u30dd\u30a4\u30f3\u30c8\u3092\u307e\u3068\u3081\u308b\u3068\uff1a<\/p>\n\n\n<div id=\"id-e0f7c2b7-571c-407c-bdc8-3a652d7e03f9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30e1\u30bd\u30c3\u30c9<\/th><th>\u6700\u9069\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/th><th>\u6ce8\u610f\u70b9<\/th><\/tr><\/thead><tbody><tr><td>each<\/td><td>\u30fb\u914d\u5217\u3084\u30cf\u30c3\u30b7\u30e5\u306e\u5168\u8981\u7d20\u306e\u51e6\u7406<br>\u30fb\u526f\u4f5c\u7528\u3092\u4f34\u3046\u51e6\u7406<\/td><td>\u623b\u308a\u5024\u306f\u5143\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8<\/td><\/tr><tr><td>map<\/td><td>\u30fb\u30c7\u30fc\u30bf\u5909\u63db<br>\u30fb\u65b0\u3057\u3044\u914d\u5217\u306e\u4f5c\u6210<\/td><td>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306b\u6ce8\u610f<\/td><\/tr><tr><td>times<\/td><td>\u30fb\u56fa\u5b9a\u56de\u6570\u306e\u51e6\u7406<br>\u30fb\u9023\u756a\u30c7\u30fc\u30bf\u306e\u751f\u6210<\/td><td>0\u304b\u3089\u30ab\u30a6\u30f3\u30c8\u958b\u59cb<\/td><\/tr><tr><td>loop<\/td><td>\u30fb\u6761\u4ef6\u4ed8\u304d\u30eb\u30fc\u30d7<br>\u30fb\u30ea\u30c8\u30e9\u30a4\u51e6\u7406<\/td><td>break\u5fd8\u308c\u306b\u6ce8\u610f<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u52b9\u7387\u7684\u3067\u8aad\u307f\u3084\u3059\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u3001\u526f\u4f5c\u7528\u306e\u6709\u7121\uff08\u30c7\u30fc\u30bf\u306e\u5909\u66f4\u3092\u4f34\u3046\u304b\uff09\u3068\u65b0\u3057\u3044\u914d\u5217\u306e\u751f\u6210\u306e\u5fc5\u8981\u6027\u3092\u8003\u616e\u3057\u3066\u3001\u9069\u5207\u306a\u30e1\u30bd\u30c3\u30c9\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-8\">\u5b9f\u8df5\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u30c6\u30af\u30cb\u30c3\u30af\u96c6<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30eb\u30fc\u30d7\u3092\u8aad\u307f\u3084\u3059\u304f\u66f8\u304f\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30eb\u30fc\u30d7\u306f\u8907\u96d1\u306b\u306a\u308a\u304c\u3061\u3067\u3059\u304c\u3001\u4ee5\u4e0b\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u4f7f\u3046\u3053\u3068\u3067\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30e1\u30bd\u30c3\u30c9\u306e\u62bd\u51fa<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u60aa\u3044\u4f8b\uff1a\u30cd\u30b9\u30c8\u304c\u6df1\u304f\u7406\u89e3\u3057\u3065\u3089\u3044\nusers.each do |user|\n  user.orders.each do |order|\n    order.items.each do |item|\n      total += item.price\n    end\n  end\nend\n\n# \u826f\u3044\u4f8b\uff1a\u51e6\u7406\u3092\u9069\u5207\u306b\u5206\u5272\ndef calculate_item_total(items)\n  items.sum(&amp;:price)\nend\n\ndef calculate_order_total(orders)\n  orders.sum { |order| calculate_item_total(order.items) }\nend\n\nusers.each do |user|\n  user_total = calculate_order_total(user.orders)\n  update_user_spending(user, user_total)\nend<\/pre>\n\n\n\n<p><strong>2. Enumerable\u30e2\u30b8\u30e5\u30fc\u30eb\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u8907\u96d1\u306a\u30cd\u30b9\u30c8\u306e\u4ee3\u308f\u308a\u306b\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\nusers\n  .flat_map(&amp;:orders)\n  .flat_map(&amp;:items)\n  .sum(&amp;:price)<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">break\u3068next\u3092\u4f7f\u3063\u305f\u5236\u5fa1\u30d5\u30ed\u30fc\u306e\u6700\u9069\u5316<\/h3>\n\n\n\n<p>\u30eb\u30fc\u30d7\u5185\u306e\u5236\u5fa1\u30d5\u30ed\u30fc\u3092\u6700\u9069\u5316\u3059\u308b\u3053\u3068\u3067\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3068\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>break\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u6761\u4ef6\u3092\u6e80\u305f\u3059\u6700\u521d\u306e\u8981\u7d20\u3092\u898b\u3064\u3051\u308b\nresult = users.each do |user|\n  if user.premium?\n    break user  # \u6761\u4ef6\u3092\u6e80\u305f\u3057\u305f\u3089\u3059\u3050\u306b\u51e6\u7406\u3092\u7d42\u4e86\n  end\nend\n\n# \u65e9\u671f\u30ea\u30bf\u30fc\u30f3\u306b\u3088\u308b\u6700\u9069\u5316\ndef find_valid_user(users)\n  users.each do |user|\n    return user if user.valid?  # \u6761\u4ef6\u3092\u6e80\u305f\u3057\u305f\u3089\u5373\u5ea7\u306breturn\n  end\n  nil  # \u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\nend<\/pre>\n\n\n\n<p><strong>next\u3092\u4f7f\u3063\u305f\u4e0d\u8981\u306a\u51e6\u7406\u306e\u30b9\u30ad\u30c3\u30d7\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">orders.each do |order|\n  next if order.cancelled?  # \u30ad\u30e3\u30f3\u30bb\u30eb\u6e08\u307f\u306e\u6ce8\u6587\u306f\u30b9\u30ad\u30c3\u30d7\n  next if order.shipped?   # \u767a\u9001\u6e08\u307f\u306e\u6ce8\u6587\u3082\u30b9\u30ad\u30c3\u30d7\n\n  process_order(order)     # \u51e6\u7406\u304c\u5fc5\u8981\u306a\u6ce8\u6587\u306e\u307f\u5b9f\u884c\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u30eb\u30fc\u30d7\u3067\u4f4d\u7f6e\u60c5\u5831\u3092\u6d3b\u7528\u3059\u308b<\/h3>\n\n\n\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u60c5\u5831\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<p><strong>each_with_index\u306e\u6d3b\u7528\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u914d\u5217\u306e\u8981\u7d20\u3068\u4f4d\u7f6e\u3092\u540c\u6642\u306b\u51e6\u7406\nwords.each_with_index do |word, index|\n  puts \"#{index + 1}\u756a\u76ee\u306e\u5358\u8a9e: #{word}\"\nend\n\n# \u7279\u5b9a\u306e\u4f4d\u7f6e\u306e\u8981\u7d20\u306b\u5bfe\u3059\u308b\u51e6\u7406\nnumbers.each_with_index do |num, index|\n  if index.even?\n    process_even_position(num)\n  else\n    process_odd_position(num)\n  end\nend<\/pre>\n\n\n\n<p><strong>with_index\u3068\u305d\u306e\u4ed6\u306e\u30e1\u30bd\u30c3\u30c9\u306e\u7d44\u307f\u5408\u308f\u305b\uff1a<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># map\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u7d44\u307f\u5408\u308f\u305b\nresult = words.map.with_index do |word, index|\n  \"#{index}: #{word.capitalize}\"\nend\n\n# select\u3068\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u7d44\u307f\u5408\u308f\u305b\nselected = numbers.select.with_index do |num, index|\n  num.even? &amp;&amp; index.odd?  # \u5076\u6570\u304b\u3064\u5947\u6570\u4f4d\u7f6e\u306e\u8981\u7d20\u3092\u9078\u629e\nend<\/pre>\n\n\n\n<p>\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u306e\u307e\u3068\u3081\uff1a<\/p>\n\n\n<div id=\"id-5877a694-d771-4ea0-be8b-c1f903afbeb3\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c6\u30af\u30cb\u30c3\u30af<\/th><th>\u4e3b\u306a\u7528\u9014<\/th><th>\u30e1\u30ea\u30c3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u30e1\u30bd\u30c3\u30c9\u62bd\u51fa<\/td><td>\u8907\u96d1\u306a\u30cd\u30b9\u30c8\u306e\u6574\u7406<\/td><td>\u30b3\u30fc\u30c9\u306e\u518d\u5229\u7528\u6027\u3068\u53ef\u8aad\u6027\u306e\u5411\u4e0a<\/td><\/tr><tr><td>\u5236\u5fa1\u30d5\u30ed\u30fc\u6700\u9069\u5316<\/td><td>\u51e6\u7406\u306e\u52b9\u7387\u5316<\/td><td>\u4e0d\u8981\u306a\u7e70\u308a\u8fd4\u3057\u306e\u524a\u6e1b<\/td><\/tr><tr><td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6d3b\u7528<\/td><td>\u4f4d\u7f6e\u306b\u57fa\u3065\u304f\u51e6\u7406<\/td><td>\u3088\u308a\u67d4\u8edf\u306a\u5236\u5fa1\u304c\u53ef\u80fd<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p><strong>\u9ad8\u5ea6\u306a\u30c6\u30af\u30cb\u30c3\u30af\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Enumerator\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=\"\"># \u7121\u9650\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u751f\u6210\nfibonacci = Enumerator.new do |yielder|\n  a, b = 0, 1\n  loop do\n    yielder &lt;&lt; a\n    a, b = b, a + b\n  end\nend\n\n# \u6700\u521d\u306e10\u500b\u306e\u30d5\u30a3\u30dc\u30ca\u30c3\u30c1\u6570\u3092\u53d6\u5f97\nfibonacci.take(10)  # =&gt; [0, 1, 1, 2, 3, 5, 8, 13, 21, 34]<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><strong>\u30d6\u30ed\u30c3\u30af\u306e\u30ed\u30fc\u30ab\u30eb\u5909\u6570\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=\"\"># \u5916\u90e8\u306e\u30b9\u30b3\u30fc\u30d7\u3068\u7af6\u5408\u3057\u306a\u3044\u5909\u6570\u306e\u4f7f\u7528\nitems.each do |item; total|  # total\u306f\u30d6\u30ed\u30c3\u30af\u30ed\u30fc\u30ab\u30eb\n  total = calculate_total(item)\n  process_item(item, total)\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u304c\u9ad8\u304f\u3001\u52b9\u7387\u7684\u306a\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-12\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u5b9f\u88c5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-13\">each vs map\uff1a\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u5b9f\u884c\u901f\u5ea6\u306e\u6bd4\u8f03<\/h3>\n\n\n\n<p>each\u3068map\u306f\u4f3c\u305f\u3088\u3046\u306a\u6a5f\u80fd\u3092\u6301\u3061\u307e\u3059\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7279\u6027\u304c\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002\u5b9f\u969b\u306e\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u7d50\u679c\u3092\u898b\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=\"\">require 'benchmark'\nrequire 'memory_profiler'\n\narray = (1..100000).to_a\n\n# \u5b9f\u884c\u901f\u5ea6\u306e\u6bd4\u8f03\nBenchmark.bm do |x|\n  x.report('each:') do\n    result = []\n    array.each { |n| result &lt;&lt; n * 2 }\n  end\n\n  x.report('map:') do\n    result = array.map { |n| n * 2 }\n  end\nend\n\n# \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6bd4\u8f03\nMemoryProfiler.report do\n  array.each { |n| n * 2 }\nend.pretty_print\n\nMemoryProfiler.report do\n  array.map { |n| n * 2 }\nend.pretty_print<\/pre>\n\n\n\n<p>\u6bd4\u8f03\u7d50\u679c\uff1a<\/p>\n\n\n<div id=\"id-13734a38-876c-4ebd-9635-831017100919\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30e1\u30bd\u30c3\u30c9<\/th><th>\u7279\u5fb4<\/th><th>\u9069\u3057\u3066\u3044\u308b\u5834\u5408<\/th><th>\u9069\u3057\u3066\u3044\u306a\u3044\u5834\u5408<\/th><\/tr><\/thead><tbody><tr><td>each<\/td><td>\u30fb\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u826f\u3044<br>\u30fb\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u3089\u306a\u3044<\/td><td>\u526f\u4f5c\u7528\u3092\u4f34\u3046\u51e6\u7406<br>\u8981\u7d20\u306e\u5909\u66f4\u304c\u4e0d\u8981\u306a\u5834\u5408<\/td><td>\u65b0\u3057\u3044\u914d\u5217\u304c\u5fc5\u8981\u306a\u5834\u5408<\/td><\/tr><tr><td>map<\/td><td>\u30fb\u51e6\u7406\u901f\u5ea6\u304c\u901f\u3044<br>\u30fb\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210<\/td><td>\u30c7\u30fc\u30bf\u5909\u63db\u304c\u5fc5\u8981\u306a\u5834\u5408<br>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408<\/td><td>\u30e1\u30e2\u30ea\u306b\u5236\u7d04\u304c\u3042\u308b\u5834\u5408<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u5927\u91cf\u30c7\u30fc\u30bf\u51e6\u7406\u6642\u306e\u30eb\u30fc\u30d7\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u969b\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u304c\u6709\u52b9\u3067\u3059\uff1a<\/p>\n\n\n\n<p><strong>1. \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u60aa\u3044\u4f8b\uff1a1\u4ef6\u305a\u3064\u51e6\u7406\nusers.each do |user|\n  user.send_notification\nend\n\n# \u826f\u3044\u4f8b\uff1a\u30d0\u30c3\u30c1\u51e6\u7406\nusers.each_slice(100) do |batch|\n  NotificationService.bulk_send(batch)\nend<\/pre>\n\n\n\n<p><strong>2. Enumerable#lazy\u306e\u4f7f\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30e1\u30e2\u30ea\u3092\u5927\u91cf\u6d88\u8cbb\u3059\u308b\u4f8b\nresult = (1..Float::INFINITY)\n  .map { |n| n * 2 }\n  .select { |n| n % 3 == 0 }\n  .take(5)\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u4f8b\nresult = (1..Float::INFINITY)\n  .lazy\n  .map { |n| n * 2 }\n  .select { |n| n % 3 == 0 }\n  .take(5)\n  .force<\/pre>\n\n\n\n<p><strong>3. \u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class DataStream\n  def initialize(filename)\n    @file = File.open(filename)\n  end\n\n  def each_chunk\n    return enum_for(:each_chunk) unless block_given?\n\n    while chunk = @file.read(1024)\n      yield chunk\n    end\n  ensure\n    @file.close\n  end\nend\n\n# \u5927\u304d\u306a\u30d5\u30a1\u30a4\u30eb\u3092\u5c11\u3057\u305a\u3064\u51e6\u7406\nstream = DataStream.new('large_file.txt')\nstream.each_chunk do |chunk|\n  process_data(chunk)\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u4e0d\u8981\u306a\u30eb\u30fc\u30d7\u3092\u6e1b\u3089\u3059\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u624b\u6cd5<\/h3>\n\n\n\n<p>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5411\u4e0a\u3055\u305b\u308b\u305f\u3081\u3001\u4e0d\u8981\u306a\u30eb\u30fc\u30d7\u3092\u524a\u6e1b\u3059\u308b\u65b9\u6cd5\u3092\u898b\u3066\u3044\u304d\u307e\u3059\uff1a<\/p>\n\n\n\n<p><strong>1. \u8907\u6570\u306e\u30eb\u30fc\u30d7\u3092\u7d71\u5408<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u60aa\u3044\u4f8b\uff1a\u8907\u6570\u56de\u306e\u30eb\u30fc\u30d7\ntotal = orders.map(&amp;:total).sum\ncount = orders.count\naverage = total \/ count\n\n# \u826f\u3044\u4f8b\uff1a1\u56de\u306e\u30eb\u30fc\u30d7\u3067\u8a08\u7b97\ntotal, count = orders.reduce([0, 0]) do |(sum, cnt), order|<\/pre>\n\n\n[sum + order.total, cnt + 1]\n\n\n\n<p>end average = total \/ count<\/p>\n\n\n\n<p><strong>2. \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30a2\u30af\u30bb\u30b9\u306e\u6700\u9069\u5316<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u60aa\u3044\u4f8b\uff1a\u6bce\u56de\u691c\u7d22\nusers.each do |user|\n  role = roles.find { |r| r.user_id == user.id }\n  process_user_role(user, role)\nend\n\n# \u826f\u3044\u4f8b\uff1a\u30cf\u30c3\u30b7\u30e5\u30de\u30c3\u30d7\u3092\u4f7f\u7528\nrole_map = roles.index_by(&amp;:user_id)\nusers.each do |user|\n  role = role_map[user.id]\n  process_user_role(user, role)\nend<\/pre>\n\n\n\n<p><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\uff1a<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u6e2c\u5b9a\u3092\u5148\u306b\u884c\u3046<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u672c\u5f53\u306b\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u3063\u3066\u3044\u308b\u7b87\u6240\u3092\u7279\u5b9a<\/li>\n\n\n\n<li><code>ruby-prof<\/code>\u3084<code>stackprof<\/code>\u3092\u4f7f\u7528\u3057\u305f\u30d7\u30ed\u30d5\u30a1\u30a4\u30ea\u30f3\u30b0<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>GC.stat<\/code>\u3092\u4f7f\u7528\u3057\u305f\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u76e3\u8996<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u65e9\u671f\u767a\u898b<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u9069\u5207\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e<\/strong><\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u914d\u5217 vs \u30cf\u30c3\u30b7\u30e5\u306e\u4f7f\u3044\u5206\u3051<\/li>\n\n\n\n<li>Set\u6d3b\u7528\u306b\u3088\u308b\u691c\u7d22\u306e\u9ad8\u901f\u5316<\/li>\n<\/ul>\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=\"\"># \u691c\u7d22\u304c\u591a\u3044\u5834\u5408\u306fSet\u3092\u4f7f\u7528\nrequire 'set'\nvalid_users = Set.new(User.valid.pluck(:id))\n\nusers.each do |user|\n  next unless valid_users.include?(user.id)  # \u9ad8\u901f\u306a\u691c\u7d22\n  process_user(user)\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u7528\u3059\u308b\u969b\u306f\u3001\u5fc5\u305a\u30d9\u30f3\u30c1\u30de\u30fc\u30af\u3092\u53d6\u3063\u3066\u52b9\u679c\u3092\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002\u307e\u305f\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">\u3088\u304f\u3042\u308b\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u7121\u9650\u30eb\u30fc\u30d7\u306b\u9665\u3089\u306a\u3044\u305f\u3081\u306e\u5b9f\u88c5\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>\u7121\u9650\u30eb\u30fc\u30d7\u306f\u3001\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3084\u30ea\u30bd\u30fc\u30b9\u6d88\u8cbb\u306b\u91cd\u5927\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u539f\u56e0\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u7d42\u4e86\u6761\u4ef6\u306e\u8a2d\u5b9a\u30df\u30b9<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u7d42\u4e86\u6761\u4ef6\u304c\u6e80\u305f\u3055\u308c\u306a\u3044\u53ef\u80fd\u6027\ncounter = 0\nwhile counter != 10\n  counter += 2  # 2\u305a\u3064\u5897\u52a0\u3059\u308b\u306810\u306b\u5230\u9054\u3057\u306a\u3044\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u9069\u5207\u306a\u6bd4\u8f03\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\ncounter = 0\nwhile counter &lt; 10\n  counter += 2\nend<\/pre>\n\n\n\n<p><strong>2. break\u5fd8\u308c\u306e\u9632\u6b62<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1abreak\u5fd8\u308c\u306e\u30ea\u30b9\u30af\nloop do\n  data = fetch_data\n  if data.valid?\n    process_data(data)\n    # break\u3092\u5fd8\u308c\u308b\u3068\u7121\u9650\u30eb\u30fc\u30d7\n  end\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1aearly return\u30d1\u30bf\u30fc\u30f3\u306e\u6d3b\u7528\ndef process_data_safely\n  loop do\n    data = fetch_data\n    break unless data.valid?\n\n    process_data(data)\n    break  # \u51e6\u7406\u5b8c\u4e86\u5f8c\u306f\u5fc5\u305abreak\n  end\nend<\/pre>\n\n\n\n<p><strong>3. \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u6a5f\u69cb\u306e\u5b9f\u88c5<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u4ed8\u304d\u30eb\u30fc\u30d7\ndef with_timeout(timeout_sec)\n  start_time = Time.now\n  loop do\n    yield\n    break if Time.now - start_time &gt; timeout_sec\n  end\nrescue StandardError =&gt; e\n  logger.error \"Timeout occurred: #{e.message}\"\nend\n\n# \u4f7f\u7528\u4f8b\nwith_timeout(5) do\n  # \u51e6\u7406\u5185\u5bb9\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u30eb\u30fc\u30d7\u51e6\u7406\u306e\u66f8\u304d\u65b9<\/h3>\n\n\n\n<p>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306f\u9577\u6642\u9593\u7a3c\u50cd\u3059\u308b\u30d7\u30ed\u30b0\u30e9\u30e0\u3067\u7279\u306b\u554f\u984c\u3068\u306a\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u4e3b\u306a\u539f\u56e0\u3068\u5bfe\u7b56\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u5927\u304d\u306a\u914d\u5217\u306e\u84c4\u7a4d<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\u3057\u7d9a\u3051\u308b\nresults = []\nlarge_data.each do |item|\n  results &lt;&lt; process_item(item)  # \u914d\u5217\u304c\u969b\u9650\u306a\u304f\u5927\u304d\u304f\u306a\u308b\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u306e\u6d3b\u7528\nlarge_data.each do |item|\n  result = process_item(item)\n  save_to_database(result)  # \u9010\u6b21\u7684\u306b\u4fdd\u5b58\nend<\/pre>\n\n\n\n<p><strong>2. \u30af\u30ed\u30fc\u30b8\u30e3\u306b\u3088\u308b\u30e1\u30e2\u30ea\u30ea\u30fc\u30af<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u30af\u30ed\u30fc\u30b8\u30e3\u304c\u5927\u304d\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4fdd\u6301\nlarge_object = create_large_object\ncallbacks = []\nitems.each do |item|\n  callbacks &lt;&lt; -&gt; { process_with(large_object, item) }\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u5fc5\u8981\u306a\u60c5\u5831\u306e\u307f\u3092\u4fdd\u6301\nitems.each do |item|\n  item_id = item.id  # \u5fc5\u8981\u306a\u60c5\u5831\u306e\u307f\u62bd\u51fa\n  callbacks &lt;&lt; -&gt; { process_with_id(item_id) }\nend<\/pre>\n\n\n\n<p><strong>3. \u30ea\u30bd\u30fc\u30b9\u306e\u9069\u5207\u306a\u89e3\u653e<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u30ea\u30bd\u30fc\u30b9\u304c\u89e3\u653e\u3055\u308c\u306a\u3044\nfiles.each do |file_path|\n  file = File.open(file_path)\n  process_file(file)\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u30d6\u30ed\u30c3\u30af\u5f62\u5f0f\u3067\u30ea\u30bd\u30fc\u30b9\u3092\u7ba1\u7406\nfiles.each do |file_path|\n  File.open(file_path) do |file|\n    process_file(file)\n  end  # \u30d5\u30a1\u30a4\u30eb\u306f\u81ea\u52d5\u7684\u306b\u30af\u30ed\u30fc\u30ba\u3055\u308c\u308b\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30cd\u30b9\u30c8\u304c\u6df1\u3044\u30eb\u30fc\u30d7\u3092\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u6df1\u3044\u30cd\u30b9\u30c8\u306f\u53ef\u8aad\u6027\u3068\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u6027\u3092\u4f4e\u4e0b\u3055\u305b\u308b\u4e3b\u306a\u8981\u56e0\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u6539\u5584\u65b9\u6cd5\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p><strong>1. \u30e1\u30bd\u30c3\u30c9\u306e\u62bd\u51fa<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u5371\u967a\u306a\u5b9f\u88c5\uff1a\u6df1\u3044\u30cd\u30b9\u30c8\nusers.each do |user|\n  user.orders.each do |order|\n    order.items.each do |item|\n      if item.category == 'electronics'\n        item.parts.each do |part|\n          if part.needs_repair?\n            schedule_repair(part)\n          end\n        end\n      end\n    end\n  end\nend\n\n# \u5b89\u5168\u306a\u5b9f\u88c5\uff1a\u8cac\u52d9\u306e\u5206\u5272\ndef needs_repair?(item)\n  return false unless item.category == 'electronics'\n  item.parts.any?(&amp;:needs_repair?)\nend\n\ndef schedule_repairs_for_item(item)\n  return unless needs_repair?(item)\n  item.parts.select(&amp;:needs_repair?).each do |part|\n    schedule_repair(part)\n  end\nend\n\ndef process_user_orders(user)\n  user.orders.flat_map(&amp;:items).each do |item|\n    schedule_repairs_for_item(item)\n  end\nend\n\n# \u30e1\u30a4\u30f3\u51e6\u7406\nusers.each do |user|\n  process_user_orders(user)\nend<\/pre>\n\n\n\n<p><strong>2. Enumerable\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/strong><\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\"># \u8907\u96d1\u306a\u30cd\u30b9\u30c8\u3092\u5e73\u5766\u5316\nrepairable_parts = users\n  .flat_map(&amp;:orders)\n  .flat_map(&amp;:items)\n  .select { |item| item.category == 'electronics' }\n  .flat_map(&amp;:parts)\n  .select(&amp;:needs_repair?)\n\nrepairable_parts.each(&amp;:schedule_repair)<\/pre>\n\n\n\n<p>\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u5bfe\u7b56\u306e\u307e\u3068\u3081\uff1a<\/p>\n\n\n<div id=\"id-bcb3ea21-f9bb-4124-bc69-f6a5399b4b84\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/th><th>\u4e3b\u306a\u554f\u984c\u70b9<\/th><th>\u5bfe\u7b56<\/th><\/tr><\/thead><tbody><tr><td>\u7121\u9650\u30eb\u30fc\u30d7<\/td><td>CPU\u30ea\u30bd\u30fc\u30b9\u306e\u67af\u6e07<\/td><td>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u8a2d\u5b9a\u3001\u9069\u5207\u306a\u7d42\u4e86\u6761\u4ef6<\/td><\/tr><tr><td>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af<\/td><td>\u30e1\u30e2\u30ea\u30ea\u30bd\u30fc\u30b9\u306e\u67af\u6e07<\/td><td>\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u3001\u9069\u5207\u306a\u30ea\u30bd\u30fc\u30b9\u89e3\u653e<\/td><\/tr><tr><td>\u6df1\u3044\u30cd\u30b9\u30c8<\/td><td>\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u4f4e\u4e0b<\/td><td>\u30e1\u30bd\u30c3\u30c9\u62bd\u51fa\u3001\u8cac\u52d9\u306e\u5206\u5272<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u907f\u3051\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5b89\u5168\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u5b9a\u671f\u7684\u306a\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3084\u30c6\u30b9\u30c8\u306e\u5b9f\u65bd\u3082\u3001\u554f\u984c\u306e\u65e9\u671f\u767a\u898b\u306b\u52b9\u679c\u7684\u3067\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-1332","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\/1332","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=1332"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1332\/revisions"}],"predecessor-version":[{"id":1333,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1332\/revisions\/1333"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1332"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1332"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1332"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}