{"id":1558,"date":"2025-03-24T08:50:24","date_gmt":"2025-03-23T23:50:24","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1558"},"modified":"2025-03-24T08:50:24","modified_gmt":"2025-03-23T23:50:24","slug":"%e3%80%90%e4%bf%9d%e5%ad%98%e7%89%88%e3%80%91ruby%e9%85%8d%e5%88%97%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%e3%81%93%e3%81%aa%e3%81%99%e3%81%9f%e3%82%81","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1558","title":{"rendered":"\u3010\u4fdd\u5b58\u7248\u3011Ruby\u914d\u5217\u5b8c\u5168\u30de\u30b9\u30bf\u30fc\uff01\u4f7f\u3044\u3053\u306a\u3059\u305f\u3081\u306e20\u306e\u57fa\u672c\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\">Ruby\u306e\u914d\u5217\u3068\u306f\uff1f\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u914d\u5217\u306e\u5b9a\u7fa9\u65b9\u6cd5\u3068\u57fa\u672c\u6982\u5ff5\u3092\u7406\u89e3\u3057\u3088\u3046<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-4\">\u4ed6\u8a00\u8a9e\u3068\u306f\u9055\u3046Ruby\u914d\u5217\u306e\u7279\u5fb4\u3068\u306f<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u914d\u5217\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">\u8981\u7d20\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u3092\u81ea\u5728\u306b\u64cd\u308b<\/a>      <\/li>      <li>        <a href=\"#i-14\">\u914d\u5217\u306e\u691c\u7d22\u3068\u62bd\u51fa\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-17\">\u914d\u5217\u306e\u5909\u63db\u3068\u52a0\u5de5\u306e\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-20\">\u3088\u304f\u4f7f\u3046\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u5b8c\u5168\u7406\u89e3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-21\">map\u30fbselect\u30fbreject\u3067\u914d\u5217\u3092\u81ea\u5728\u306b\u64cd\u4f5c<\/a>      <\/li>      <li>        <a href=\"#i-25\">\u914d\u5217\u306e\u7d50\u5408\u3068\u5206\u5272\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-28\">\u30bd\u30fc\u30c8\u3068\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-31\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u914d\u5217\u64cd\u4f5c<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-32\">\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u914d\u5217\u64cd\u4f5c\u3068\u306f<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-36\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-40\">\u5b9f\u8df5\u7684\u306a\u914d\u5217\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-41\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u3063\u305f\u52b9\u7387\u7684\u306a\u64cd\u4f5c<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-44\">\u914d\u5217\u3092\u4f7f\u3063\u305f\u5b9f\u52d9\u3067\u306e\u5177\u4f53\u4f8b<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-49\">\u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u3068\u89e3\u6c7a\u65b9\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-50\">\u914d\u5217\u64cd\u4f5c\u3067\u306e\u5178\u578b\u7684\u306a\u30d0\u30b0\u3068\u5bfe\u51e6\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-55\">\u30c7\u30d0\u30c3\u30b0\u3068\u30c6\u30b9\u30c8\u306e\u52b9\u679c\u7684\u306a\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\u914d\u5217\u3068\u306f\uff1f\u521d\u5fc3\u8005\u3067\u3082\u308f\u304b\u308b\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u914d\u5217\u306e\u5b9a\u7fa9\u65b9\u6cd5\u3068\u57fa\u672c\u6982\u5ff5\u3092\u7406\u89e3\u3057\u3088\u3046<\/h3>\n\n\n\n<p>\u914d\u5217\u306f\u3001\u8907\u6570\u306e\u30c7\u30fc\u30bf\u3092\u9806\u5e8f\u4ed8\u304d\u3067\u683c\u7d0d\u3067\u304d\u308bRuby\u306e\u57fa\u672c\u7684\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3067\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u6dfb\u5b57\uff09\u3092\u4f7f\u3063\u3066\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\u3067\u304d\u3001\u69d8\u3005\u306a\u30c7\u30fc\u30bf\u578b\u3092\u6df7\u5728\u3055\u305b\u3066\u4fdd\u5b58\u3067\u304d\u308b\u67d4\u8edf\u306a\u4ed5\u7d44\u307f\u3092\u6301\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-2\">\u914d\u5217\u306e\u5b9a\u7fa9\u65b9\u6cd5<\/h4>\n\n\n\n<p>Ruby\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u65b9\u6cd5\u3067\u914d\u5217\u3092\u5b9a\u7fa9\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=\"\"># 1. \u89d2\u62ec\u5f27\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\uff08\u6700\u3082\u4e00\u822c\u7684\uff09\nnumbers = [1, 2, 3, 4, 5]\n\n# 2. Array.new\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\nempty_array = Array.new      # \u7a7a\u306e\u914d\u5217\nsized_array = Array.new(3)   # \u30b5\u30a4\u30ba3\u306e\u914d\u5217\uff08\u5168\u8981\u7d20nil\uff09\nfilled_array = Array.new(3, 0) # \u30b5\u30a4\u30ba3\u306e\u914d\u5217\uff08\u5168\u8981\u7d200\uff09\n\n# 3. %\u8a18\u6cd5\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\uff08\u6587\u5b57\u5217\u306e\u914d\u5217\u3092\u4f5c\u308b\u5834\u5408\u306b\u4fbf\u5229\uff09\nwords = %w[apple banana orange] # =&gt; [\"apple\", \"banana\", \"orange\"]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u30a2\u30af\u30bb\u30b9<\/h4>\n\n\n\n<p>Ruby\u306e\u914d\u5217\u306f0\u304b\u3089\u59cb\u307e\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">fruits = [\"apple\", \"banana\", \"orange\"]\n\n# \u524d\u65b9\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\nputs fruits[0]  # =&gt; \"apple\"\nputs fruits[1]  # =&gt; \"banana\"\n\n# \u5f8c\u65b9\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\uff08\u8ca0\u306e\u6574\u6570\uff09\nputs fruits[-1] # =&gt; \"orange\"\uff08\u6700\u5f8c\u306e\u8981\u7d20\uff09\nputs fruits[-2] # =&gt; \"banana\"\uff08\u5f8c\u308d\u304b\u30892\u756a\u76ee\uff09<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u4ed6\u8a00\u8a9e\u3068\u306f\u9055\u3046Ruby\u914d\u5217\u306e\u7279\u5fb4\u3068\u306f<\/h3>\n\n\n\n<p>Ruby\u306e\u914d\u5217\u306b\u306f\u3001\u4ed6\u306e\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u8a00\u8a9e\u3068\u6bd4\u8f03\u3057\u3066\u7279\u5fb4\u7684\u306a\u6a5f\u80fd\u304c\u3042\u308a\u307e\u3059\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">1. \u578b\u306e\u6df7\u5728\u304c\u53ef\u80fd<\/h4>\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=\"\"># \u7570\u306a\u308b\u578b\u306e\u30c7\u30fc\u30bf\u30921\u3064\u306e\u914d\u5217\u306b\u683c\u7d0d\u53ef\u80fd\nmixed_array = [1, \"hello\", 3.14, true, [1, 2], {name: \"Ruby\"}]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">2. \u52d5\u7684\u306a\u30b5\u30a4\u30ba\u5909\u66f4<\/h4>\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]\nnumbers &lt;&lt; 4        # \u8981\u7d20\u306e\u8ffd\u52a0\nnumbers.push(5)     # \u5225\u306e\u8ffd\u52a0\u65b9\u6cd5\nnumbers.pop         # \u6700\u5f8c\u306e\u8981\u7d20\u3092\u524a\u9664<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-7\">3. \u8c4a\u5bcc\u306a\u7d44\u307f\u8fbc\u307f\u30e1\u30bd\u30c3\u30c9<\/h4>\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# map\uff08\u5404\u8981\u7d20\u306b\u5bfe\u3057\u3066\u51e6\u7406\u3092\u5b9f\u884c\uff09\ndoubled = numbers.map { |n| n * 2 }  # =&gt; [2, 4, 6, 8, 10]\n\n# select\uff08\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\uff09\nevens = numbers.select { |n| n.even? }  # =&gt; [2, 4]\n\n# reduce\uff08\u8981\u7d20\u3092\u96c6\u7d04\uff09\nsum = numbers.reduce(:+)  # =&gt; 15<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-8\">4. \u7bc4\u56f2\u6307\u5b9a\u306b\u3088\u308b\u53d6\u308a\u51fa\u3057<\/h4>\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# \u7bc4\u56f2\u3092\u6307\u5b9a\u3057\u3066\u53d6\u308a\u51fa\u3057\nsubset = numbers[1..3]    # =&gt; [2, 3, 4]\nfirst_two = numbers[0...2]  # =&gt; [1, 2]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-9\">5. \u4fbf\u5229\u306a\u7279\u6b8a\u30e1\u30bd\u30c3\u30c9<\/h4>\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\u6700\u521d\u3068\u6700\u5f8c\u306e\u8981\u7d20\u306b\u30a2\u30af\u30bb\u30b9\narray = [1, 2, 3, 4, 5]\nfirst = array.first  # =&gt; 1\nlast = array.last   # =&gt; 5\n\n# \u914d\u5217\u306e\u8981\u7d20\u6570\u3092\u53d6\u5f97\nsize = array.length  # =&gt; 5\n# \u307e\u305f\u306f\ncount = array.size   # =&gt; 5\n\n# \u914d\u5217\u304c\u7a7a\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\nempty = array.empty?  # =&gt; false<\/pre>\n\n\n\n<p>\u3053\u306e\u3088\u3046\u306b\u3001Ruby\u306e\u914d\u5217\u306f\u67d4\u8edf\u6027\u304c\u9ad8\u304f\u3001\u76f4\u611f\u7684\u306a\u64cd\u4f5c\u304c\u53ef\u80fd\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u7279\u5fb4\u306f\u3001Ruby\u306e\u300c\u30d7\u30ed\u30b0\u30e9\u30de\u30fc\u306e\u5e78\u305b\u300d\u3068\u3044\u3046\u8a2d\u8a08\u601d\u60f3\u3092\u53cd\u6620\u3057\u3066\u304a\u308a\u3001\u958b\u767a\u52b9\u7387\u3092\u9ad8\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u914d\u5217\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u30de\u30b9\u30bf\u30fc\u3057\u3088\u3046<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u8981\u7d20\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u3092\u81ea\u5728\u306b\u64cd\u308b<\/h3>\n\n\n\n<p>\u914d\u5217\u306e\u8981\u7d20\u3092\u8ffd\u52a0\u30fb\u524a\u9664\u3059\u308b\u64cd\u4f5c\u306f\u3001\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u57fa\u672c\u3068\u306a\u308a\u307e\u3059\u3002Ruby\u306b\u306f\u76f4\u611f\u7684\u3067\u5f37\u529b\u306a\u30e1\u30bd\u30c3\u30c9\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-12\">\u8981\u7d20\u306e\u8ffd\u52a0<\/h4>\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=\"\">array = [1, 2, 3]\n\n# \u672b\u5c3e\u3078\u306e\u8ffd\u52a0\narray.push(4)      # =&gt; [1, 2, 3, 4]\narray &lt;&lt; 5         # =&gt; [1, 2, 3, 4, 5]  # \u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u8ffd\u52a0\n\n# \u5148\u982d\u3078\u306e\u8ffd\u52a0\narray.unshift(0)   # =&gt; [0, 1, 2, 3, 4, 5]\n\n# \u6307\u5b9a\u4f4d\u7f6e\u3078\u306e\u633f\u5165\narray.insert(2, 'x')  # =&gt; [0, 1, 'x', 2, 3, 4, 5]\n\n# \u8907\u6570\u8981\u7d20\u306e\u540c\u6642\u8ffd\u52a0\narray.push(6, 7, 8)   # =&gt; [0, 1, 'x', 2, 3, 4, 5, 6, 7, 8]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-13\">\u8981\u7d20\u306e\u524a\u9664<\/h4>\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=\"\">array = [1, 2, 3, 4, 5]\n\n# \u672b\u5c3e\u304b\u3089\u306e\u524a\u9664\nlast = array.pop     # =&gt; 5\n# array \u306f [1, 2, 3, 4] \u306b\u306a\u308b\n\n# \u5148\u982d\u304b\u3089\u306e\u524a\u9664\nfirst = array.shift  # =&gt; 1\n# array \u306f [2, 3, 4] \u306b\u306a\u308b\n\n# \u6307\u5b9a\u4f4d\u7f6e\u306e\u524a\u9664\narray.delete_at(1)   # =&gt; 3\n# array \u306f [2, 4] \u306b\u306a\u308b\n\n# \u6307\u5b9a\u5024\u306e\u524a\u9664\uff08\u3059\u3079\u3066\u306e\u8a72\u5f53\u8981\u7d20\u304c\u524a\u9664\u3055\u308c\u308b\uff09\narray = [1, 2, 2, 3, 2, 4]\narray.delete(2)      # =&gt; [1, 3, 4]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u914d\u5217\u306e\u691c\u7d22\u3068\u62bd\u51fa\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>\u914d\u5217\u304b\u3089\u5fc5\u8981\u306a\u8981\u7d20\u3092\u63a2\u3057\u51fa\u3057\u3001\u62bd\u51fa\u3059\u308b\u64cd\u4f5c\u3082\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">\u8981\u7d20\u306e\u691c\u7d22<\/h4>\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 = [10, 20, 30, 40, 50]\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u53d6\u5f97\nindex = numbers.index(30)    # =&gt; 2\n\n# \u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u306e\u691c\u7d22\nfirst_over_35 = numbers.find { |n| n &gt; 35 }     # =&gt; 40\nall_over_35 = numbers.select { |n| n &gt; 35 }     # =&gt; [40, 50]\n\n# \u8981\u7d20\u306e\u5b58\u5728\u78ba\u8a8d\ncontains_30 = numbers.include?(30)    # =&gt; true\nany_over_45 = numbers.any? { |n| n &gt; 45 }  # =&gt; true\nall_over_5 = numbers.all? { |n| n &gt; 5 }    # =&gt; true<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-16\">\u914d\u5217\u306e\u62bd\u51fa<\/h4>\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=\"\">array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n\n# \u7bc4\u56f2\u6307\u5b9a\u306b\u3088\u308b\u62bd\u51fa\nsubset = array[2..5]      # =&gt; [3, 4, 5, 6]\nfirst_three = array.first(3)  # =&gt; [1, 2, 3]\nlast_three = array.last(3)    # =&gt; [8, 9, 10]\n\n# \u6761\u4ef6\u306b\u3088\u308b\u62bd\u51fa\nevens = array.select(&amp;:even?)  # =&gt; [2, 4, 6, 8, 10]\nodds = array.reject(&amp;:even?)   # =&gt; [1, 3, 5, 7, 9]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u914d\u5217\u306e\u5909\u63db\u3068\u52a0\u5de5\u306e\u65b9\u6cd5<\/h3>\n\n\n\n<p>\u914d\u5217\u306e\u8981\u7d20\u3092\u5909\u63db\u3057\u305f\u308a\u3001\u914d\u5217\u5168\u4f53\u3092\u52a0\u5de5\u3057\u305f\u308a\u3059\u308b\u64cd\u4f5c\u3082\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-18\">\u8981\u7d20\u306e\u5909\u63db<\/h4>\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# \u5404\u8981\u7d20\u30922\u500d\u306b\u3059\u308b\ndoubled = numbers.map { |n| n * 2 }  # =&gt; [2, 4, 6, 8, 10]\n\n# \u6587\u5b57\u5217\u306b\u5909\u63db\nstrings = numbers.map(&amp;:to_s)  # =&gt; [\"1\", \"2\", \"3\", \"4\", \"5\"]\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4ed8\u304d\u306e\u5909\u63db\nwith_index = numbers.map.with_index { |n, i| \"#{i}:#{n}\" }\n# =&gt; [\"0:1\", \"1:2\", \"2:3\", \"3:4\", \"4:5\"]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-19\">\u914d\u5217\u306e\u52a0\u5de5<\/h4>\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\u5e73\u5766\u5316\nnested = [[1, 2], [3, 4], [5, 6]]\nflattened = nested.flatten  # =&gt; [1, 2, 3, 4, 5, 6]\n\n# \u91cd\u8907\u306e\u9664\u53bb\nduplicates = [1, 2, 2, 3, 3, 4]\nunique = duplicates.uniq    # =&gt; [1, 2, 3, 4]\n\n# \u914d\u5217\u306e\u7d50\u5408\narray1 = [1, 2, 3]\narray2 = [4, 5, 6]\ncombined = array1 + array2  # =&gt; [1, 2, 3, 4, 5, 6]\n\n# \u8981\u7d20\u306e\u96c6\u7d04\nnumbers = [1, 2, 3, 4, 5]\nsum = numbers.reduce(:+)    # =&gt; 15\nproduct = numbers.reduce(:*)  # =&gt; 120<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u64cd\u4f5c\u3092\u30de\u30b9\u30bf\u30fc\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u8907\u96d1\u306a\u914d\u5217\u64cd\u4f5c\u3082\u5bb9\u6613\u306b\u5b9f\u88c5\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002\u307e\u305f\u3001\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u3055\u3089\u306b\u5f37\u529b\u306a\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-20\">\u3088\u304f\u4f7f\u3046\u914d\u5217\u30e1\u30bd\u30c3\u30c9\u3092\u5b8c\u5168\u7406\u89e3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">map\u30fbselect\u30fbreject\u3067\u914d\u5217\u3092\u81ea\u5728\u306b\u64cd\u4f5c<\/h3>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u914d\u5217\u64cd\u4f5c\u306e\u4e2d\u3067\u3082\u7279\u306b\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u91cd\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-22\">map\u30e1\u30bd\u30c3\u30c9<\/h4>\n\n\n\n<p>\u914d\u5217\u306e\u5404\u8981\u7d20\u3092\u5909\u63db\u3057\u3066\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\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=\"\">numbers = [1, 2, 3, 4, 5]\n\n# \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\nsquares = numbers.map { |n| n ** 2 }  # =&gt; [1, 4, 9, 16, 25]\n\n# \u30b7\u30f3\u30dc\u30eb\u3092\u4f7f\u7528\u3057\u305f\u77ed\u7e2e\u8a18\u6cd5\nwords = ['hello', 'world']\nupcase_words = words.map(&amp;:upcase)    # =&gt; ['HELLO', 'WORLD']\n\n# \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u305f\u5909\u63db\nindexed = numbers.map.with_index { |n, i| \"#{i}:#{n}\" }\n# =&gt; [\"0:1\", \"1:2\", \"2:3\", \"3:4\", \"4:5\"]\n\n# \u8907\u6570\u306e\u5909\u63db\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\nprocessed = numbers.map { |n| n * 2 }.map { |n| n + 1 }\n# =&gt; [3, 5, 7, 9, 11]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-23\">select\u30e1\u30bd\u30c3\u30c9\uff08find_all\u306e\u5225\u540d\uff09<\/h4>\n\n\n\n<p>\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u62bd\u51fa\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=\"\">numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]\n\n# \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\nevens = numbers.select { |n| n.even? }  # =&gt; [2, 4, 6, 8, 10]\n\n# \u8907\u6570\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b\nselected = numbers.select { |n| n &gt; 3 &amp;&amp; n.odd? }  # =&gt; [5, 7, 9]\n\n# \u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u6761\u4ef6\nwords = ['apple', 'banana', 'grape', 'orange']\nlong_words = words.select { |word| word.length &gt; 5 }  # =&gt; ['banana', 'orange']<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-24\">reject\u30e1\u30bd\u30c3\u30c9<\/h4>\n\n\n\n<p>\u6761\u4ef6\u306b\u5408\u3046\u8981\u7d20\u3092\u9664\u5916\u3057\u307e\u3059\uff08select\u306e\u9006\uff09\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, 6, 7, 8, 9, 10]\n\n# \u57fa\u672c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5\nnon_evens = numbers.reject { |n| n.even? }  # =&gt; [1, 3, 5, 7, 9]\n\n# nil\u3084\u7a7a\u6587\u5b57\u3092\u9664\u5916\narray = [1, nil, 'hello', '', nil, 2]\nclean = array.reject { |x| x.nil? || x == '' }  # =&gt; [1, 'hello', 2]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-25\">\u914d\u5217\u306e\u7d50\u5408\u3068\u5206\u5272\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">\u914d\u5217\u306e\u7d50\u5408<\/h4>\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=\"\"># +\u6f14\u7b97\u5b50\u306b\u3088\u308b\u7d50\u5408\narray1 = [1, 2, 3]\narray2 = [4, 5, 6]\ncombined = array1 + array2  # =&gt; [1, 2, 3, 4, 5, 6]\n\n# concat\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u7d50\u5408\uff08\u7834\u58ca\u7684\uff09\narray1.concat(array2)  # array1\u306f[1, 2, 3, 4, 5, 6]\u306b\u306a\u308b\n\n# join\u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u6587\u5b57\u5217\u3078\u306e\u7d50\u5408\nwords = ['Hello', 'World']\nsentence = words.join(' ')  # =&gt; \"Hello World\"\n\n# zip \u30e1\u30bd\u30c3\u30c9\u306b\u3088\u308b\u914d\u5217\u306e\u7d44\u307f\u5408\u308f\u305b\nnames = ['Alice', 'Bob']\nages = [20, 25]\nzipped = names.zip(ages)  # =&gt; [['Alice', 20], ['Bob', 25]]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-27\">\u914d\u5217\u306e\u5206\u5272<\/h4>\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, 6]\n\n# \u6570\u3067\u5206\u5272\nfirst_half, second_half = numbers.each_slice(3).to_a\n# first_half =&gt; [1, 2, 3]\n# second_half =&gt; [4, 5, 6]\n\n# \u6761\u4ef6\u3067\u5206\u5272\nevens, odds = numbers.partition { |n| n.even? }\n# evens =&gt; [2, 4, 6]\n# odds =&gt; [1, 3, 5]\n\n# take\u3068drop\u3067\u5206\u5272\nfirst_three = numbers.take(3)  # =&gt; [1, 2, 3]\nrest = numbers.drop(3)         # =&gt; [4, 5, 6]<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-28\">\u30bd\u30fc\u30c8\u3068\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-29\">\u30bd\u30fc\u30c8\u64cd\u4f5c<\/h4>\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 = [3, 1, 4, 1, 5, 9, 2, 6, 5, 3, 5]\n\n# \u57fa\u672c\u7684\u306a\u30bd\u30fc\u30c8\nsorted = numbers.sort              # =&gt; [1, 1, 2, 3, 3, 4, 5, 5, 5, 6, 9]\nreverse_sorted = numbers.sort.reverse  # =&gt; [9, 6, 5, 5, 5, 4, 3, 3, 2, 1, 1]\n\n# \u30ab\u30b9\u30bf\u30e0\u30bd\u30fc\u30c8\nwords = ['apple', 'banana', 'grape']\nby_length = words.sort_by { |word| word.length }\n# =&gt; ['grape', 'apple', 'banana']\n\n# \u8907\u6570\u6761\u4ef6\u3067\u306e\u30bd\u30fc\u30c8\npeople = [\n  {name: 'Alice', age: 25},\n  {name: 'Bob', age: 25},\n  {name: 'Charlie', age: 20}\n]\n\nsorted_people = people.sort_by { |person| [person[:age], person[:name]] }\n# \u5e74\u9f62\u3067\u6607\u9806\u30bd\u30fc\u30c8\u3001\u540c\u3058\u5e74\u9f62\u306a\u3089\u540d\u524d\u3067\u30bd\u30fc\u30c8<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-30\">\u9ad8\u5ea6\u306a\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/h4>\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=\"\">data = [1, 2, 3, nil, 4, '', 5, false, 6]\n\n# \u8907\u6570\u6761\u4ef6\u3092\u7d44\u307f\u5408\u308f\u305b\u305f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nvalid_numbers = data.select { |x| x.is_a?(Numeric) &amp;&amp; !x.nil? }\n# =&gt; [1, 2, 3, 4, 5, 6]\n\n# \u30c1\u30a7\u30fc\u30f3\u306b\u3088\u308b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nresult = data\n  .compact  # nil\u3092\u9664\u53bb\n  .select { |x| x.is_a?(Numeric) }  # \u6570\u5024\u306e\u307f\u9078\u629e\n  .map { |x| x * 2 }  # 2\u500d\u306b\n  .select { |x| x &gt; 5 }  # 5\u3088\u308a\u5927\u304d\u3044\u5024\u306e\u307f\u9078\u629e\n# =&gt; [6, 8, 10, 12]<\/pre>\n\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\u8907\u96d1\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u3082\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u51e6\u7406\u306e\u6d41\u308c\u3092\u5206\u304b\u308a\u3084\u3059\u304f\u8868\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-31\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u914d\u5217\u64cd\u4f5c<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-32\">\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u914d\u5217\u64cd\u4f5c\u3068\u306f<\/h3>\n\n\n\n<p>\u914d\u5217\u64cd\u4f5c\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316\u3059\u308b\u306b\u306f\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068CPU\u51e6\u7406\u6642\u9593\u306e\u4e21\u65b9\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-33\">\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u3068\u975e\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u5206\u3051<\/h4>\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=\"\"># \u975e\u52b9\u7387\u306a\u4f8b\uff08\u65b0\u3057\u3044\u914d\u5217\u3092\u751f\u6210\uff09\nnumbers = [1, 2, 3, 4, 5]\nresult = []\nnumbers.each { |n| result &lt;&lt; n * 2 }  # \u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\n\n# \u52b9\u7387\u7684\u306a\u4f8b\uff08\u65e2\u5b58\u306e\u914d\u5217\u3092\u5909\u66f4\uff09\nnumbers = [1, 2, 3, 4, 5]\nnumbers.map! { |n| n * 2 }  # \u65e2\u5b58\u306e\u914d\u5217\u3092\u76f4\u63a5\u5909\u66f4\n\n# \u4f7f\u3044\u5206\u3051\u306e\u4f8b\ndef process_data(data)\n  if data.size &gt; 10000\n    # \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306f\u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\n    data.map! { |x| x * 2 }\n  else\n    # \u5c0f\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306f\u65b0\u3057\u3044\u914d\u5217\u3092\u4f5c\u6210\n    data.map { |x| x * 2 }\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-34\">\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3<\/h4>\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=\"\">large_array = (1..1000000).to_a\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u304c\u60aa\u3044\u4f8b\nlarge_array.map { |n| n * 2 }  # \u65b0\u3057\u3044\u5927\u304d\u306a\u914d\u5217\u3092\u4f5c\u6210\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u4f8b\uff08\u5fc5\u8981\u306a\u90e8\u5206\u3060\u3051\u3092\u51e6\u7406\uff09\nlarge_array.each_slice(1000) do |slice|\n  slice.each { |n| process(n) }  # 1000\u4ef6\u305a\u3064\u51e6\u7406\nend\n\n# Enumerator\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u51e6\u7406\nenum = large_array.lazy.map { |n| n * 2 }\nenum.first(10)  # \u6700\u521d\u306e10\u4ef6\u3060\u3051\u51e6\u7406<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-35\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u30c6\u30af\u30cb\u30c3\u30af<\/h4>\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\u4f8b\ndef process_large_data\n  large_array = (1..1000000).to_a\n  result = large_array.map { |n| n * 2 }\n  # large_array\u304c\u4e0d\u8981\u306b\u306a\u3063\u3066\u3082GC\u3055\u308c\u306a\u3044\u53ef\u80fd\u6027\nend\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u4f8b\ndef process_large_data\n  result = []\n  File.foreach('large_file.txt') do |line|\n    # 1\u884c\u305a\u3064\u51e6\u7406\u3057\u3066\u30e1\u30e2\u30ea\u6d88\u8cbb\u3092\u6291\u3048\u308b\n    result &lt;&lt; process_line(line)\n  end\n  result\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-36\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u6ce8\u610f\u70b9<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-37\">\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BatchProcessor\n  def self.process_in_batches(array, batch_size = 1000)\n    array.each_slice(batch_size) do |batch|\n      # \u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u5185\u3067\u30d0\u30c3\u30c1\u51e6\u7406\n      ActiveRecord::Base.transaction do\n        batch.each { |item| process_item(item) }\n      end\n    end\n  end\n\n  private\n\n  def self.process_item(item)\n    # \u500b\u5225\u306e\u51e6\u7406\n  end\nend\n\n# \u4f7f\u7528\u4f8b\nlarge_data = (1..1000000).to_a\nBatchProcessor.process_in_batches(large_data)<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-38\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u76e3\u8996\u3068\u6700\u9069\u5316<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">require 'benchmark'\nrequire 'memory_profiler'\n\n# \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u8a08\u6e2c\nreport = MemoryProfiler.report do\n  large_array = (1..100000).to_a\n  large_array.map { |n| n * 2 }\nend\n\n# \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\nBenchmark.bm do |x|\n  x.report(\"\u901a\u5e38\u306e\u51e6\u7406:\") { large_array.map { |n| n * 2 } }\n  x.report(\"\u30d0\u30c3\u30c1\u51e6\u7406:\") do\n    large_array.each_slice(1000) { |batch| batch.map! { |n| n * 2 } }\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-39\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305f\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30e1\u30bd\u30c3\u30c9\u306e\u9078\u629e<\/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=\"\">numbers = [1, 2, 3, 4, 5]\n\n# \u975e\u52b9\u7387\uff08\u914d\u5217\u5168\u4f53\u3092\u8d70\u67fb\uff09\nfound = numbers.select { |n| n &gt; 3 }.first\n\n# \u52b9\u7387\u7684\uff08\u6761\u4ef6\u3092\u6e80\u305f\u3059\u6700\u521d\u306e\u8981\u7d20\u3067\u7d42\u4e86\uff09\nfound = numbers.find { |n| n &gt; 3 }<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u4e8b\u524d\u306e\u914d\u5217\u30b5\u30a4\u30ba\u6307\u5b9a<\/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=\"\"># \u975e\u52b9\u7387\uff08\u914d\u5217\u306e\u30ea\u30b5\u30a4\u30ba\u304c\u767a\u751f\uff09\narray = []\n1000.times { |i| array &lt;&lt; i }\n\n# \u52b9\u7387\u7684\uff08\u4e8b\u524d\u306b\u30b5\u30a4\u30ba\u3092\u78ba\u4fdd\uff09\narray = Array.new(1000) { |i| i }<\/pre>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3<\/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=\"\"># \u5927\u898f\u6a21\u51e6\u7406\u524d\u306bGC\u3092\u5b9f\u884c\nGC.start\nresult = process_large_data\n# \u51e6\u7406\u5f8c\u306b\u30e1\u30e2\u30ea\u3092\u89e3\u653e\nresult = nil\nGC.start<\/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\u30e2\u30ea\u52b9\u7387\u304c\u826f\u304f\u3001\u9ad8\u901f\u306a\u914d\u5217\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u305f\u3060\u3057\u3001\u904e\u5ea6\u306a\u6700\u9069\u5316\u306f\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u5b9f\u969b\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30d0\u30e9\u30f3\u30b9\u3092\u53d6\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-40\">\u5b9f\u8df5\u7684\u306a\u914d\u5217\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-41\">\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u4f7f\u3063\u305f\u52b9\u7387\u7684\u306a\u64cd\u4f5c<\/h3>\n\n\n\n<p>\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u8907\u6570\u306e\u51e6\u7406\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-42\">\u57fa\u672c\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u30c1\u30a7\u30fc\u30f3<\/h4>\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 = [\n  { name: 'Alice', age: 25, active: true },\n  { name: 'Bob', age: 30, active: false },\n  { name: 'Charlie', age: 20, active: true }\n]\n\n# \u30a2\u30af\u30c6\u30a3\u30d6\u306a\u82e5\u3044\u30e6\u30fc\u30b6\u30fc\u3092\u53d6\u5f97\u3057\u3001\u540d\u524d\u3092\u62bd\u51fa\nyoung_active_users = users\n  .select { |user| user[:active] }\n  .select { |user| user[:age] &lt; 25 }\n  .map { |user| user[:name] }\n# =&gt; [\"Charlie\"]\n\n# \u4e0a\u8a18\u30921\u884c\u3067\u66f8\u3044\u305f\u5834\u5408\uff08\u53ef\u8aad\u6027\u306f\u4f4e\u4e0b\uff09\nyoung_active_users = users.select { |u| u[:active] &amp;&amp; u[:age] &lt; 25 }.map { |u| u[:name] }<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-43\">\u8907\u96d1\u306a\u51e6\u7406\u306e\u30c1\u30a7\u30fc\u30f3<\/h4>\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=\"\">data = [\n  [1, \"a\"], [2, \"b\"], [1, \"c\"],\n  [3, \"d\"], [2, \"e\"], [3, \"f\"]\n]\n\n# \u30b0\u30eb\u30fc\u30d7\u5316\u3057\u3066\u52a0\u5de5\u3059\u308b\u4f8b\nprocessed_data = data\n  .group_by(&amp;:first)           # ID \u3067\u30b0\u30eb\u30fc\u30d7\u5316\n  .transform_values do |group| # \u5404\u30b0\u30eb\u30fc\u30d7\u3092\u5909\u63db\n    group\n      .map(&amp;:last)            # 2\u756a\u76ee\u306e\u8981\u7d20\u3092\u62bd\u51fa\n      .join(', ')             # \u30ab\u30f3\u30de\u533a\u5207\u308a\u306e\u6587\u5b57\u5217\u306b\n  end\n# =&gt; {1=&gt;[\"a, c\"], 2=&gt;[\"b, e\"], 3=&gt;[\"d, f\"]}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-44\">\u914d\u5217\u3092\u4f7f\u3063\u305f\u5b9f\u52d9\u3067\u306e\u5177\u4f53\u4f8b<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-45\">\u30c7\u30fc\u30bf\u5909\u63db\u51e6\u7406<\/h4>\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\ncsv_data = [\n  [\"ID\", \"Name\", \"Score\"],\n  [\"1\", \"Alice\", \"85\"],\n  [\"2\", \"Bob\", \"92\"],\n  [\"3\", \"Charlie\", \"78\"]\n]\n\n# \u30d8\u30c3\u30c0\u30fc\u3068\u5024\u3092\u5206\u96e2\u3057\u3066\u30cf\u30c3\u30b7\u30e5\u306b\u5909\u63db\nheader = csv_data.first\nrecords = csv_data[1..]\n  .map do |row|\n    header.zip(row).to_h.transform_keys(&amp;:downcase)\n  end\n# =&gt; [\n#      {\"id\"=&gt;\"1\", \"name\"=&gt;\"Alice\", \"score\"=&gt;\"85\"},\n#      {\"id\"=&gt;\"2\", \"name\"=&gt;\"Bob\", \"score\"=&gt;\"92\"},\n#      {\"id\"=&gt;\"3\", \"name\"=&gt;\"Charlie\", \"score\"=&gt;\"78\"}\n#    ]<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-46\">\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class BatchProcessor\n  def self.process_records(records, batch_size: 1000)\n    records.each_slice(batch_size).map do |batch|\n      begin\n        process_batch(batch)\n      rescue =&gt; e\n        log_error(e, batch)\n        []  # \u30a8\u30e9\u30fc\u6642\u306f\u7a7a\u914d\u5217\u3092\u8fd4\u3059\n      end\n    end.flatten\n  end\n\n  private\n\n  def self.process_batch(batch)\n    # \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5\n    batch.map { |record| transform_record(record) }\n  end\n\n  def self.transform_record(record)\n    # \u30ec\u30b3\u30fc\u30c9\u306e\u5909\u63db\u51e6\u7406\n    { id: record[:id], processed_at: Time.now }\n  end\n\n  def self.log_error(error, batch)\n    # \u30a8\u30e9\u30fc\u30ed\u30b0\u306e\u8a18\u9332\n    puts \"Error processing batch: #{error.message}\"\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-47\">\u30c7\u30fc\u30bf\u96c6\u8a08\u51e6\u7406<\/h4>\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=\"\">sales_data = [\n  { date: '2024-01-01', amount: 1000, category: 'A' },\n  { date: '2024-01-01', amount: 1500, category: 'B' },\n  { date: '2024-01-02', amount: 2000, category: 'A' },\n  { date: '2024-01-02', amount: 2500, category: 'B' }\n]\n\n# \u65e5\u4ed8\u3054\u3068\u306e\u58f2\u4e0a\u96c6\u8a08\ndaily_totals = sales_data\n  .group_by { |sale| sale[:date] }\n  .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n# =&gt; {\"2024-01-01\"=&gt;2500, \"2024-01-02\"=&gt;4500}\n\n# \u30ab\u30c6\u30b4\u30ea\u30fc\u5225\u306e\u96c6\u8a08\ncategory_totals = sales_data\n  .group_by { |sale| sale[:category] }\n  .transform_values { |sales| sales.sum { |sale| sale[:amount] } }\n# =&gt; {\"A\"=&gt;3000, \"B\"=&gt;4000}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-48\">\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3068\u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3<\/h4>\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 DataProcessor\n  def self.process_with_validation(data)\n    validated_data = data.map do |item|\n      begin\n        validate_item(item)\n      rescue ValidationError =&gt; e\n        log_validation_error(e, item)\n        nil\n      end\n    end.compact\n\n    process_valid_data(validated_data)\n  end\n\n  private\n\n  def self.validate_item(item)\n    raise ValidationError, \"Invalid item\" unless item.valid?\n    item\n  end\n\n  def self.process_valid_data(data)\n    # \u6709\u52b9\u306a\u30c7\u30fc\u30bf\u306e\u51e6\u7406\n    data.map { |item| transform_item(item) }\n  end\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u7684\u306a\u30c6\u30af\u30cb\u30c3\u30af\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u5805\u7262\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u9069\u5207\u306a\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0\u3068\u30ed\u30b0\u8a18\u9332\u3092\u7d44\u307f\u8fbc\u3080\u3053\u3068\u3067\u3001\u554f\u984c\u306e\u65e9\u671f\u767a\u898b\u3068\u89e3\u6c7a\u304c\u5bb9\u6613\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-49\">\u3088\u304f\u3042\u308b\u30c8\u30e9\u30d6\u30eb\u3068\u89e3\u6c7a\u65b9\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-50\">\u914d\u5217\u64cd\u4f5c\u3067\u306e\u5178\u578b\u7684\u306a\u30d0\u30b0\u3068\u5bfe\u51e6\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-51\">1. nil\u306b\u95a2\u9023\u3059\u308b\u30a8\u30e9\u30fc<\/h4>\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=\"\"># \u3088\u304f\u3042\u308b\u554f\u984c\uff1anil\u3092\u542b\u3080\u914d\u5217\u306e\u51e6\u7406\ndata = [1, nil, 3, nil, 5]\n\n# \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\nresult = data.map { |x| x * 2 }  # NoMethodError: undefined method `*' for nil:NilClass\n\n# \u89e3\u6c7a\u65b9\u6cd51\uff1anil\u3092\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\nsafe_result = data.compact.map { |x| x * 2 }\n\n# \u89e3\u6c7a\u65b9\u6cd52\uff1anil\u306e\u5834\u5408\u306e\u51e6\u7406\u3092\u660e\u793a\nsafe_result = data.map { |x| x.nil? ? 0 : x * 2 }\n\n# \u89e3\u6c7a\u65b9\u6cd53\uff1a&amp;.\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\nobjects = [{ value: 1 }, nil, { value: 3 }]\nsafe_values = objects.map { |obj| obj&amp;.dig(:value) }<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-52\">2. \u7834\u58ca\u7684\u30e1\u30bd\u30c3\u30c9\u306b\u95a2\u3059\u308b\u554f\u984c<\/h4>\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=\"\"># \u610f\u56f3\u3057\u306a\u3044\u914d\u5217\u306e\u5909\u66f4\ndef process_array(arr)\n  arr.select! { |x| x.even? }  # \u5143\u306e\u914d\u5217\u3092\u5909\u66f4\u3057\u3066\u3057\u307e\u3046\nend\n\nnumbers = [1, 2, 3, 4, 5]\nprocess_array(numbers)\n# numbers\u304c\u5909\u66f4\u3055\u308c\u3066\u3044\u308b\n\n# \u89e3\u6c7a\u65b9\u6cd5\uff1a\u914d\u5217\u306e\u30b3\u30d4\u30fc\u3092\u4f7f\u7528\ndef safe_process_array(arr)\n  arr.dup.select! { |x| x.even? }  # \u307e\u305f\u306f arr.select { |x| x.even? }\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-53\">3. \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u7bc4\u56f2\u5916\u30a8\u30e9\u30fc<\/h4>\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=\"\">array = [1, 2, 3]\n\n# \u554f\u984c\u306e\u3042\u308b\u30b3\u30fc\u30c9\nvalue = array[5]  # nil \u304c\u8fd4\u3055\u308c\u308b\uff08\u30a8\u30e9\u30fc\u306b\u306f\u306a\u3089\u306a\u3044\uff09\narray[5] = 10    # nil \u304c\u81ea\u52d5\u7684\u306b\u633f\u5165\u3055\u308c\u308b\n\n# \u3088\u308a\u5b89\u5168\u306a\u65b9\u6cd5\ndef get_element(array, index)\n  if index &lt; array.length\n    array[index]\n  else\n    raise IndexError, \"Index #{index} is out of bounds\"\n  end\nend\n\n# \u914d\u5217\u306e\u7bc4\u56f2\u3092\u78ba\u8a8d\ndef set_element(array, index, value)\n  raise IndexError, \"Index out of bounds\" if index &gt; array.length\n  array[index] = value\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-54\">4. \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u9632\u6b62<\/h4>\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\ndef process_large_data\n  large_array = []\n  File.foreach('huge_file.txt') do |line|\n    large_array &lt;&lt; line  # \u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\u3057\u7d9a\u3051\u308b\n  end\n  large_array\nend\n\n# \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\ndef process_large_data\n  Enumerator.new do |yielder|\n    File.foreach('huge_file.txt') do |line|\n      yielder &lt;&lt; process_line(line)\n    end\n  end\nend<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-55\">\u30c7\u30d0\u30c3\u30b0\u3068\u30c6\u30b9\u30c8\u306e\u52b9\u679c\u7684\u306a\u65b9\u6cd5<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-56\">\u30c7\u30d0\u30c3\u30b0\u30c6\u30af\u30cb\u30c3\u30af<\/h4>\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. p\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u305f\u30c7\u30d0\u30c3\u30b0\ndef debug_array_processing(array)\n  p \"\u51e6\u7406\u524d\u306e\u914d\u5217: #{array}\"\n  result = array.map { |x| x * 2 }\n  p \"\u51e6\u7406\u5f8c\u306e\u914d\u5217: #{result}\"\n  result\nend\n\n# 2. byebug\u306e\u4f7f\u7528\nrequire 'byebug'\n\ndef complex_processing(array)\n  byebug  # \u3053\u3053\u3067\u30c7\u30d0\u30c3\u30ac\u30fc\u304c\u8d77\u52d5\n  transformed = array.map { |x| transform(x) }\n  filtered = transformed.select { |x| filter_condition(x) }\n  filtered\nend\n\n# 3. \u30ed\u30b0\u51fa\u529b\u306e\u5b9f\u88c5\nclass ArrayProcessor\n  def self.process_with_logging(array)\n    logger = Logger.new(STDOUT)\n    logger.info(\"\u51e6\u7406\u958b\u59cb: #{array.inspect}\")\n\n    begin\n      result = process(array)\n      logger.info(\"\u51e6\u7406\u6210\u529f: #{result.inspect}\")\n      result\n    rescue =&gt; e\n      logger.error(\"\u30a8\u30e9\u30fc\u767a\u751f: #{e.message}\")\n      raise\n    end\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-57\">\u30c6\u30b9\u30c8\u5b9f\u88c5\u4f8b<\/h4>\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 'minitest\/autorun'\n\nclass ArrayProcessorTest &lt; Minitest::Test\n  def setup\n    @processor = ArrayProcessor.new\n  end\n\n  def test_empty_array\n    assert_equal [], @processor.process([])\n  end\n\n  def test_nil_handling\n    assert_raises(ArgumentError) { @processor.process(nil) }\n  end\n\n  def test_normal_processing\n    input = [1, 2, 3]\n    expected = [2, 4, 6]\n    assert_equal expected, @processor.process(input)\n  end\n\n  def test_edge_cases\n    assert_equal [0], @processor.process([0])\n    assert_equal [], @processor.process([])\n    assert_raises(TypeError) { @processor.process(['a', 'b']) }\n  end\nend<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-58\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8<\/h4>\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'\n\ndef performance_test\n  small_array = (1..100).to_a\n  large_array = (1..10000).to_a\n\n  Benchmark.bmbm do |x|\n    x.report(\"\u5c0f\u898f\u6a21\u914d\u5217\u51e6\u7406\") { process_array(small_array) }\n    x.report(\"\u5927\u898f\u6a21\u914d\u5217\u51e6\u7406\") { process_array(large_array) }\n  end\nend\n\n# \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\nrequire 'memory_profiler'\n\nMemoryProfiler.report do\n  # \u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u51e6\u7406\n  large_array = (1..10000).to_a\n  process_array(large_array)\nend.pretty_print<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-59\">\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def safe_process(array)\n  raise ArgumentError, \"\u914d\u5217\u304c\u5fc5\u8981\u3067\u3059\" unless array.is_a?(Array)\n  raise ArgumentError, \"\u7a7a\u306e\u914d\u5217\u306f\u51e6\u7406\u3067\u304d\u307e\u305b\u3093\" if array.empty?\n\n  array.map { |element| process_element(element) }\nrescue StandardError =&gt; e\n  logger.error(\"\u51e6\u7406\u30a8\u30e9\u30fc: #{e.message}\")\n  raise ProcessingError, \"\u914d\u5217\u306e\u51e6\u7406\u306b\u5931\u6557\u3057\u307e\u3057\u305f: #{e.message}\"\nend<\/pre>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li>\u5165\u529b\u5024\u306e\u691c\u8a3c<\/li>\n<\/ol>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">def validate_array(array)\n  return false unless array.is_a?(Array)\n  return false if array.empty?\n  array.all? { |element| valid_element?(element) }\nend\n\ndef valid_element?(element)\n  element.is_a?(Numeric) &amp;&amp; element &gt;= 0\nend<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c8\u30e9\u30d6\u30eb\u30b7\u30e5\u30fc\u30c6\u30a3\u30f3\u30b0\u624b\u6cd5\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u914d\u5217\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u9069\u5207\u306a\u30c6\u30b9\u30c8\u3068\u30c7\u30d0\u30c3\u30b0\u624b\u6cd5\u3092\u7528\u3044\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u306e\u65e9\u671f\u767a\u898b\u3068\u89e3\u6c7a\u304c\u53ef\u80fd\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":{"0":"post-1558","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\/1558","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=1558"}],"version-history":[{"count":1,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1558\/revisions"}],"predecessor-version":[{"id":1559,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1558\/revisions\/1559"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1558"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1558"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1558"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}