{"id":59,"date":"2022-12-30T22:06:27","date_gmt":"2023-05-15T14:56:39","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/%e5%a6%82%e4%bd%95%e5%9c%a8-ruby-%e4%b8%ad%e4%bd%bf%e7%94%a8%e6%95%b0%e7%bb%84%e6%96%b9%e6%b3%95\/"},"modified":"2025-07-31T22:13:40","modified_gmt":"2025-07-31T14:13:40","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8-ruby-%e4%b8%ad%e4%bd%bf%e7%94%a8%e6%95%b0%e7%bb%84%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%a6%82%e4%bd%95%e5%9c%a8-ruby-%e4%b8%ad%e4%bd%bf%e7%94%a8%e6%95%b0%e7%bb%84%e6%96%b9%e6%b3%95\/","title":{"rendered":"Ruby \u6570\u7ec4\u65b9\u6cd5\u8be6\u89e3\uff1a\u638c\u63e1\u9ad8\u6548\u6570\u636e\u5904\u7406\u6280\u5de7"},"content":{"rendered":"<h3>\u7b80\u4ecb<\/h3>\n<p>\u6570\u7ec4\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u8868\u793a\u6570\u636e\u5217\u8868\u3002\u4e00\u65e6\u60a8\u6709\u4e86\u6570\u7ec4\u4e2d\u7684\u6570\u636e\uff0c\u5c31\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u6392\u5e8f\u3001\u53bb\u9664\u91cd\u590d\u9879\u3001\u53cd\u8f6c\u987a\u5e8f\u3001\u63d0\u53d6\u6570\u7ec4\u7684\u90e8\u5206\u6216\u8005\u5728\u6570\u7ec4\u4e2d\u641c\u7d22\u7279\u5b9a\u6570\u636e\u3002\u60a8\u8fd8\u53ef\u4ee5\u5c06\u6570\u7ec4\u8f6c\u6362\u6210\u5b57\u7b26\u4e32\uff0c\u5c06\u4e00\u4e2a\u6570\u636e\u6570\u7ec4\u8f6c\u6362\u6210\u53e6\u4e00\u4e2a\u6570\u7ec4\uff0c\u5e76\u5c06\u4e00\u4e2a\u6570\u7ec4\u5408\u5e76\u6210\u4e00\u4e2a\u5355\u4e00\u7684\u503c\u3002<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u63a2\u7d22\u4e00\u4e9b Ruby \u63d0\u4f9b\u7684\u6700\u5b9e\u7528\u7684\u65b9\u6cd5\uff0c\u7528\u4e8e\u5904\u7406\u5b58\u50a8\u5728\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u3002<\/p>\n<p>\u5728\u60a8\u5b66\u4e60\u672c\u6559\u7a0b\u65f6\uff0c\u60a8\u4f1a\u770b\u5230\u4e00\u4e9b\u65b9\u6cd5\u4ee5\u611f\u53f9\u53f7\uff08<code>!<\/code>\uff09\u7ed3\u5c3e\u3002\u8fd9\u4e9b\u65b9\u6cd5\u901a\u5e38\u4f1a\u5177\u6709\u526f\u4f5c\u7528\uff0c\u4f8b\u5982\u6539\u53d8\u539f\u59cb\u503c\u6216\u5f15\u53d1\u5f02\u5e38\u3002\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u8bb8\u591a\u65b9\u6cd5\u90fd\u6709\u4e00\u4e2a\u76f8\u5173\u7684\u5e26\u6709\u8fd9\u4e2a\u540e\u7f00\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u60a8\u4e5f\u4f1a\u9047\u5230\u4ee5\u95ee\u53f7\uff08<code>?<\/code>\uff09\u7ed3\u5c3e\u7684\u65b9\u6cd5\u3002\u8fd9\u4e9b\u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u5e03\u5c14\u503c\u3002<\/p>\n<p>\u8fd9\u662f Ruby \u4e2d\u5e38\u7528\u7684\u547d\u540d\u7ea6\u5b9a\u3002\u5b83\u5e76\u4e0d\u662f\u5728\u7a0b\u5e8f\u7ea7\u522b\u4e0a\u5f3a\u5236\u6267\u884c\u7684\uff0c\u800c\u53ea\u662f\u8bc6\u522b\u65b9\u6cd5\u53ef\u9884\u671f\u884c\u4e3a\u7684\u53e6\u4e00\u79cd\u65b9\u5f0f\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u4ece\u51e0\u79cd\u8bbf\u95ee\u5143\u7d20\u7684\u65b9\u6cd5\u5f00\u59cb\u63a2\u7d22\u6570\u7ec4\u65b9\u6cd5\u3002<\/p>\n<h2>\u8bbf\u95ee\u5143\u7d20<\/h2>\n<p>\u5982\u679c\u60a8\u5df2\u7ecf\u6309\u7167 Ruby \u4e2d\u7684\u6570\u7ec4\u6559\u7a0b\u64cd\u4f5c\u8fc7\u4e86\uff0c\u60a8\u5c31\u4f1a\u77e5\u9053\u53ef\u4ee5\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u5355\u4e2a\u5143\u7d20\uff0c\u7d22\u5f15\u662f\u4ece\u96f6\u5f00\u59cb\u7684\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Tiger\", \"Great White\", \"Hammerhead\", \"Angel\"]\r\nsharks[0] # \"Tiger\"\r\nsharks[1] # \"Great White\"\r\nsharks[-1] # \"Angel\"\r\n<\/code><\/pre>\n<p>\u60a8\u53ef\u80fd\u8fd8\u8bb0\u5f97\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>first<\/code> \u548c <code>last<\/code> \u65b9\u6cd5\u6765\u83b7\u53d6\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u548c\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Tiger\", \"Great White\", \"Hammerhead\", \"Angel\"]\r\nsharks.first # \"Tiger\"\r\nsharks.last # \"Angel\"\r\n<\/code><\/pre>\n<p>\u6700\u540e\uff0c\u5f53\u60a8\u8bbf\u95ee\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u5143\u7d20\u65f6\uff0c\u60a8\u5c06\u5f97\u5230 <code>nil<\/code>\u3002\u4f46\u662f\u5982\u679c\u60a8\u60f3\u8981\u83b7\u5f97\u9519\u8bef\u800c\u4e0d\u662f <code>nil<\/code>\uff0c\u8bf7\u4f7f\u7528 <code>fetch<\/code> \u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks.fetch(42)\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>IndexError: index 42 outside of array bounds: -4...4\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u5e0c\u671b\u6307\u5b9a\u81ea\u5df1\u7684\u9ed8\u8ba4\u8bbe\u7f6e\u800c\u4e0d\u662f\u5f15\u53d1\u9519\u8bef\uff0c\u4e5f\u53ef\u4ee5\u8fd9\u6837\u505a\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks.fetch(42, \"Nope\") # \"Nope\"\r\n<\/code><\/pre>\n<p>\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u591a\u4e2a\u5143\u7d20\u3002<\/p>\n<h2>\u83b7\u53d6\u591a\u4e2a\u5143\u7d20<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c2\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: \u6709\u65f6\u60a8\u53ef\u80fd\u5e0c\u671b\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u4e00\u90e8\u5206\u503c\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u5355\u4e2a\u5143\u7d20\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6307\u5b9a\u4e00\u4e2a\u8d77\u59cb\u7d22\u5f15\uff0c\u7136\u540e\u6307\u5b9a\u8981\u83b7\u53d6\u7684\u5143\u7d20\u6570\u91cf\uff0c\u60a8\u5c06\u83b7\u5f97\u4e00\u4e2a\u5305\u542b\u8fd9\u4e9b\u503c\u7684\u65b0\u6570\u7ec4\u3002\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u50cf\u8fd9\u6837\u4ece <code>sharks<\/code> \u6570\u7ec4\u4e2d\u83b7\u53d6\u4e24\u4e2a\u4e2d\u95f4\u6761\u76ee\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Great White\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Hammerhead\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Angel\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nsharks<span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">]<\/span> <span class=\"token comment\"># [\"Great White\", \"Hammerhead\"]<\/span>\r\n<\/code><\/pre>\n<p>\u6211\u4eec\u4ece\u7d22\u5f15 1 \u5f00\u59cb\uff0c\u5373\u201cGreat White\u201d\uff0c\u5e76\u6307\u5b9a\u6211\u4eec\u60f3\u8981\u4e24\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u6211\u4eec\u5f97\u5230\u4e00\u4e2a\u5305\u542b\u201cGreat White\u201d\u548c\u201cHammerhead\u201d\u7684\u65b0\u6570\u7ec4\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>slice<\/code> \u65b9\u6cd5\u6765\u505a\u76f8\u540c\u7684\u4e8b\u60c5\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Great White\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Hammerhead\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Angel\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nsharks<span class=\"token punctuation\">.<\/span>slice<span class=\"token punctuation\">(<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># [\"Great White\", \"Hammerhead\"]<\/span>\r\n<\/code><\/pre>\n<p><code>slice<\/code> \u65b9\u6cd5\u4e5f\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u4e0d\u6539\u53d8\u539f\u59cb\u6570\u7ec4\u3002\u7136\u800c\uff0c\u5982\u679c\u60a8\u4f7f\u7528 <code>slice!<\/code> \u65b9\u6cd5\uff0c\u539f\u59cb\u6570\u7ec4\u4e5f\u4f1a\u88ab\u6539\u53d8\u3002<\/p>\n<p><code>take<\/code> \u65b9\u6cd5\u5141\u8bb8\u60a8\u4ece\u6570\u7ec4\u7684\u5f00\u5934\u83b7\u53d6\u6307\u5b9a\u6570\u91cf\u7684\u6761\u76ee\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Great White\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Hammerhead\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Angel\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nsharks<span class=\"token punctuation\">.<\/span>take<span class=\"token punctuation\">(<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">)<\/span> <span class=\"token comment\"># [\"Tiger\", \"Great White\"]<\/span>\r\n<\/code><\/pre>\n<p>\u6709\u65f6\u60a8\u60f3\u4ece\u6570\u7ec4\u4e2d\u968f\u673a\u6293\u53d6\u4e00\u4e2a\u503c\uff0c\u800c\u4e0d\u662f\u7279\u5b9a\u7684\u4e00\u4e2a\u3002\u8ba9\u6211\u4eec\u63a2\u7d22\u4e00\u4e0b\u5982\u4f55\u5b9e\u73b0\u3002<\/p>\n<h2>\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u4e00\u4e2a\u968f\u673a\u6761\u76ee<\/h2>\n<p>\u4e5f\u8bb8\u60a8\u6b63\u5728\u5f00\u53d1\u4e00\u6b3e\u8d4c\u535a\u6e38\u620f\uff0c\u6216\u8005\u60a8\u6b63\u5728\u7f16\u5199\u4e00\u4e2a\u80fd\u591f\u9009\u62e9\u7ade\u8d5b\u83b7\u80dc\u8005\u7684\u7a0b\u5e8f\u3002\u8fd9\u4e9b\u4e8b\u60c5\u90fd\u9700\u8981\u67d0\u79cd\u968f\u673a\u503c\u3002\u4e00\u4e2a\u5e38\u89c1\u7684\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u5c06\u53ef\u80fd\u7684\u9009\u62e9\u653e\u5165\u4e00\u4e2a\u6570\u7ec4\u4e2d\uff0c\u7136\u540e\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u7d22\u5f15\u3002<\/p>\n<p>\u8981\u4ece\u6570\u7ec4\u4e2d\u83b7\u53d6\u4e00\u4e2a\u968f\u673a\u5143\u7d20\uff0c\u60a8\u53ef\u4ee5\u751f\u6210\u4e00\u4e2a\u4ecb\u4e8e 0 \u5230\u6570\u7ec4\u6700\u540e\u4e00\u4e2a\u7d22\u5f15\u4e4b\u95f4\u7684\u968f\u673a\u7d22\u5f15\uff0c\u5e76\u5c06\u5176\u7528\u4f5c\u7d22\u5f15\u6765\u68c0\u7d22\u503c\uff0c\u4f46\u8fd8\u6709\u4e00\u79cd\u66f4\u7b80\u5355\u7684\u65b9\u6cd5\uff1a<code>sample<\/code> \u65b9\u6cd5\u4ece\u6570\u7ec4\u4e2d\u968f\u673a\u9009\u62e9\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n<p>\u8ba9\u6211\u4eec\u7528\u5b83\u4ece\u4e00\u7ec4\u9884\u8bbe\u7b54\u6848\u4e2d\u968f\u673a\u83b7\u53d6\u4e00\u4e2a\u7b54\u6848\uff0c\u521b\u9020\u4e00\u4e2a\u539f\u59cb\u7248\u672c\u7684\u201c\u795e\u5947\u516b\u7403\u201d\u6e38\u620f\u3002<\/p>\n<div>\n<p>\u4ee5\u4e0b\u662f <code>8ball.rb<\/code> \u7684\u4ee3\u7801\uff1a<\/p>\n<pre class=\"post-pre\"><code>answers <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Yes\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"No\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Maybe\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Ask again later\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nprint answers<span class=\"token punctuation\">.<\/span>sample\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>Maybe<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<\/div>\n<p><code>sample<\/code> \u65b9\u6cd5\u8fd8\u63a5\u53d7\u4e00\u4e2a\u53c2\u6570\uff0c\u8be5\u53c2\u6570\u4f1a\u8fd4\u56de\u4e00\u4e2a\u968f\u673a\u6761\u76ee\u7684\u6570\u7ec4\u3002\u6240\u4ee5\uff0c\u5982\u679c\u60a8\u9700\u8981\u591a\u4e2a\u968f\u673a\u6761\u76ee\uff0c\u53ea\u9700\u63d0\u4f9b\u60a8\u60f3\u8981\u7684\u6570\u91cf\u3002<\/p>\n<div>\u968f\u673a\u9ca8\u9c7c.rb<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c3\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nsample = sharks.sample(2)\r\nprint sample\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"\u8f93\u51fa\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Whale\", \"Great White\"]\r\n<\/code><\/pre>\n<p>\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u770b\u770b\u5982\u4f55\u5728\u6570\u7ec4\u4e2d\u627e\u5230\u7279\u5b9a\u7684\u5143\u7d20\u3002<\/p>\n<h2>\u5bfb\u627e\u548c\u8fc7\u6ee4\u5143\u7d20<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c4\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5f53\u4f60\u5728\u6570\u7ec4\u4e2d\u5bfb\u627e\u7279\u5b9a\u5143\u7d20\u65f6\uff0c\u901a\u5e38\u9700\u8981\u904d\u5386\u6570\u7ec4\u7684\u5143\u7d20\u76f4\u5230\u627e\u5230\u76ee\u6807\u3002\u7136\u800c\uff0cRuby \u6570\u7ec4\u63d0\u4f9b\u4e86\u51e0\u79cd\u4e13\u95e8\u8bbe\u8ba1\u6765\u7b80\u5316\u6570\u7ec4\u641c\u7d22\u8fc7\u7a0b\u7684\u65b9\u6cd5\u3002<\/p>\n<p>\u5982\u679c\u4f60\u53ea\u662f\u60f3\u67e5\u770b\u4e00\u4e2a\u5143\u7d20\u662f\u5426\u5b58\u5728\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>include?<\/code> \u65b9\u6cd5\u3002\u5982\u679c\u6307\u5b9a\u7684\u6570\u636e\u662f\u6570\u7ec4\u7684\u4e00\u4e2a\u5143\u7d20\uff0c\u8be5\u65b9\u6cd5\u4f1a\u8fd4\u56de <code>true<\/code>\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nsharks.include? \"Tiger\" # => true\r\n\r\n[\"a\", \"b\", \"c\"].include? 2 # => false\r\n<\/code><\/pre>\n<p>\u7136\u800c\uff0c<code>include?<\/code> \u65b9\u6cd5\u9700\u8981\u5b8c\u5168\u5339\u914d\uff0c\u56e0\u6b64\u4f60\u4e0d\u80fd\u7528\u4e8e\u67e5\u627e\u90e8\u5206\u5355\u8bcd\u6216\u8fdb\u884c\u5927\u5c0f\u5199\u4e0d\u654f\u611f\u7684\u5339\u914d\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nsharks.include? \"Tiger\" # => true\r\nsharks.include? \"tiger\" # => false (\u5927\u5c0f\u5199\u4e0d\u5339\u914d)\r\nsharks.include? \"ti\" # => false (\u90e8\u5206\u5339\u914d\u4e0d\u751f\u6548)\r\n<\/code><\/pre>\n<p><code>find<\/code> \u65b9\u6cd5\uff08\u6216 <code>detect<\/code> \u65b9\u6cd5\uff0c\u5b83\u4eec\u662f\u522b\u540d\uff09\u7528\u4e8e\u5b9a\u4f4d\u5e76\u8fd4\u56de\u6570\u7ec4\u4e2d\u4e0e\u4f60\u6307\u5b9a\u6761\u4ef6\u5339\u914d\u7684<strong>\u7b2c\u4e00\u4e2a<\/strong>\u5143\u7d20\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8981\u627e\u5230\u5305\u542b\u5b57\u6bcd &#8216;a&#8217; \u7684 <code>sharks<\/code> \u6570\u7ec4\u4e2d\u7684\u7b2c\u4e00\u4e2a\u6761\u76ee\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>each<\/code> \u65b9\u6cd5\u9010\u4e2a\u6bd4\u8f83\u6bcf\u4e2a\u6761\u76ee\uff0c\u5e76\u5728\u627e\u5230\u7b2c\u4e00\u4e2a\u5339\u914d\u9879\u65f6\u505c\u6b62\u8fed\u4ee3\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresult = nil\r\nsharks.each do |shark|\r\n  if shark.include?(\"a\")\r\n    result = shark\r\n    break\r\n  end\r\nend\r\n# result \u73b0\u5728\u662f \"Hammerhead\"\r\n<\/code><\/pre>\n<p>\u6216\u8005\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u66f4\u7b80\u6d01\u7684 <code>find<\/code> \u65b9\u6cd5\u6765\u5b8c\u6210\u76f8\u540c\u7684\u4efb\u52a1\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresult = sharks.find { |item| item.include?(\"a\") }\r\nputs result\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Hammerhead\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c5\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<p>\u5bf9\u4e8e\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c<code>find<\/code> \u65b9\u6cd5\u4f1a\u6267\u884c\u60a8\u63d0\u4f9b\u7684\u4ee3\u7801\u5757\u3002\u5982\u679c\u4ee3\u7801\u5757\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u8868\u8fbe\u5f0f\u8bc4\u4f30\u4e3a\u771f\uff0c<code>find<\/code> \u65b9\u6cd5\u5c06\u8fd4\u56de\u8be5\u503c\u5e76\u505c\u6b62\u8fed\u4ee3\u3002\u5982\u679c\u5728\u904d\u5386\u6240\u6709\u5143\u7d20\u540e\u6ca1\u6709\u627e\u5230\u4efb\u4f55\u503c\uff0c\u5b83\u4f1a\u8fd4\u56de <code>nil<\/code>\u3002<\/p>\n<p><code>select<\/code> \u65b9\u6cd5\u7684\u5de5\u4f5c\u65b9\u5f0f\u7c7b\u4f3c\uff0c\u4f46\u4e0d\u540c\u4e4b\u5904\u5728\u4e8e\u5b83\u4f1a\u6784\u9020\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u5305\u542b\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u5143\u7d20\uff0c\u800c\u4e0d\u4ec5\u4ec5\u8fd4\u56de\u4e00\u4e2a\u5355\u4e00\u503c\u5e76\u505c\u6b62\u5904\u7406\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresults = sharks.select {|item| item.include?(\"a\")}\r\nprint results<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Hammerhead\", \"Great White\", \"Whale\"]<\/code><\/pre>\n<p><code>reject<\/code> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u4e0d\u7b26\u5408\u6761\u4ef6\u7684\u65b0\u6570\u7ec4\u3002\u4f60\u53ef\u4ee5\u628a\u5b83\u770b\u4f5c\u662f\u4e00\u4e2a\u8fc7\u6ee4\u5668\uff0c\u7528\u4e8e\u5220\u9664\u4e0d\u60f3\u8981\u7684\u5143\u7d20\u3002\u4ee5\u4e0b\u662f\u4e00\u4e2a\u4f8b\u5b50\uff0c\u62d2\u7edd\u6240\u6709\u5305\u542b\u5b57\u6bcd &#8216;a&#8217; \u7684\u6761\u76ee\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresults = sharks.reject {|item| item.include?(\"a\")}\r\nprint results<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Tiger\"]<\/code><\/pre>\n<p><code>select<\/code> \u548c <code>reject<\/code> \u90fd\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u539f\u59cb\u6570\u7ec4\u4fdd\u6301\u4e0d\u53d8\u3002\u4e0d\u8fc7\uff0c\u5982\u679c\u4f7f\u7528 <code>select!<\/code> \u548c <code>reject!<\/code> \u65b9\u6cd5\uff0c\u539f\u59cb\u6570\u7ec4\u5c06\u88ab\u4fee\u6539\u3002<\/p>\n<p><code>find_all<\/code> \u65b9\u6cd5\u662f <code>select<\/code> \u7684\u522b\u540d\uff0c\u4f46\u662f\u6ca1\u6709 <code>find_all!<\/code> \u65b9\u6cd5\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u5982\u4f55\u5bf9\u6570\u7ec4\u7684\u503c\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<h2>\u5bf9\u6570\u7ec4\u8fdb\u884c\u6392\u5e8f<\/h2>\n<p>\u6392\u5e8f\u6570\u636e\u662f\u4e00\u79cd\u5e38\u89c1\u7684\u505a\u6cd5\u3002\u60a8\u53ef\u80fd\u9700\u8981\u6309\u5b57\u6bcd\u987a\u5e8f\u6392\u5217\u540d\u5355\u6216\u6309\u4ece\u5c0f\u5230\u5927\u7684\u987a\u5e8f\u6392\u5e8f\u6570\u5b57\u3002<\/p>\n<p>Ruby \u7684\u6570\u7ec4\u6709\u4e00\u4e2a <code>reverse<\/code> \u65b9\u6cd5\uff0c\u53ef\u4ee5\u5c06\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u987a\u5e8f\u53cd\u8f6c\u3002\u5982\u679c\u4f60\u6709\u4e00\u4e2a\u5df2\u7ecf\u6392\u597d\u5e8f\u7684\u6570\u636e\u5217\u8868\uff0c\u4f7f\u7528 <code>reverse<\/code> \u53ef\u4ee5\u5feb\u901f\u5730\u5c06\u5143\u7d20\u7ffb\u8f6c\u8fc7\u6765\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Angel\", \"Great White\", \"Hammerhead\", \"Tiger\"]\r\nreversed_sharks = sharks.reverse\r\nprint reversed_sharks<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Tiger\", \"Hammerhead\", \"Great White\", \"Angel\"]<\/code><\/pre>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c6\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>[\"Tiger\", \"Hammerhead\", \"Great White\", \"Angel\"]<\/code><\/pre>\n<p><code>reverse<\/code> \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u5e76\u4e14\u4e0d\u4fee\u6539\u539f\u59cb\u6570\u7ec4\u3002\u5982\u679c\u4f60\u60f3\u6539\u53d8\u539f\u59cb\u6570\u7ec4\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>reverse!<\/code> \u65b9\u6cd5\u3002<\/p>\n<p>\u7136\u800c\uff0c\u53cd\u8f6c\u6570\u7ec4\u5e76\u4e0d\u603b\u662f\u6700\u6709\u6548\u6216\u6700\u5b9e\u9645\u7684\u6570\u636e\u6392\u5e8f\u65b9\u6cd5\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>sort<\/code> \u65b9\u6cd5\u6309\u7167\u6240\u9700\u7684\u65b9\u5f0f\u5bf9\u6570\u7ec4\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u5bf9\u4e8e\u7b80\u5355\u7684\u5b57\u7b26\u4e32\u6570\u7ec4\u6216\u6570\u5b57\u6570\u7ec4\uff0c<code>sort<\/code> \u65b9\u6cd5\u662f\u9ad8\u6548\u7684\uff0c\u5e76\u4e14\u4f1a\u7ed9\u4f60\u60f3\u8981\u7684\u7ed3\u679c\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Tiger\", \"Great White\", \"Hammerhead\", \"Angel\"]\r\nsorted_sharks = sharks.sort\r\nprint sorted_sharks<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Angel\", \"Great White\", \"Hammerhead\", \"Tiger\"]<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5982\u679c\u4f60\u60f3\u4ee5\u4e0d\u540c\u7684\u65b9\u5f0f\u5bf9\u4e8b\u7269\u8fdb\u884c\u6392\u5e8f\uff0c\u4f60\u9700\u8981\u544a\u8bc9 <code>sort<\/code> \u65b9\u6cd5\u5982\u4f55\u64cd\u4f5c\u3002<code>sort<\/code> \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a Ruby \u5757\uff0c\u8be5\u5757\u4f7f\u4f60\u80fd\u591f\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\uff0c\u4ee5\u4fbf\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n<p>\u4e3a\u4e86\u8fdb\u884c\u6bd4\u8f83\uff0c\u4f60\u4f7f\u7528\u6bd4\u8f83\u8fd0\u7b97\u7b26\uff08<code>&lt;=&gt;<\/code>\uff09\uff0c\u901a\u5e38\u79f0\u4e3a\u201c\u592a\u7a7a\u8239\u8fd0\u7b97\u7b26\u201d\u3002\u8fd9\u4e2a\u8fd0\u7b97\u7b26\u6bd4\u8f83\u4e24\u4e2a Ruby \u5bf9\u8c61\uff0c\u5e76\u8fd4\u56de <code>-1<\/code>\uff08\u5982\u679c\u5de6\u8fb9\u7684\u5bf9\u8c61\u8f83\u5c0f\uff09\u3001<code>0<\/code>\uff08\u5982\u679c\u4e24\u4e2a\u5bf9\u8c61\u76f8\u7b49\uff09\u6216 <code>1<\/code>\uff08\u5982\u679c\u5de6\u8fb9\u7684\u5bf9\u8c61\u8f83\u5927\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>1 &lt;=&gt; 2 # -1\r\n2 &lt;=&gt; 2 # 0\r\n2 &lt;=&gt; 1 # 1<\/code><\/pre>\n<p>Ruby \u7684 <code>sort<\/code> \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u5fc5\u987b\u8fd4\u56de <code>-1<\/code>\u3001<code>0<\/code> \u6216 <code>1<\/code> \u7684\u5757\uff0c\u7136\u540e\u7528\u5b83\u6765\u5bf9\u6570\u7ec4\u4e2d\u7684\u503c\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e2a\u660e\u786e\u6bd4\u8f83\u6570\u7ec4\u5143\u7d20\u5e76\u6309\u5347\u5e8f\u6392\u5e8f\u7684\u793a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Tiger\", \"Great White\", \"Hammerhead\", \"Angel\"]\r\nsorted_sharks = sharks.sort{|a,b| a &lt;=&gt; b }\r\nprint sorted_sharks<\/code><\/pre>\n<p><code>a<\/code> \u548c <code>b<\/code> \u53d8\u91cf\u4ee3\u8868\u6570\u7ec4\u4e2d\u8fdb\u884c\u6bd4\u8f83\u7684\u5355\u4e2a\u5143\u7d20\u3002\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[\"Angel\", \"Great White\", \"Hammerhead\", \"Tiger\"]<\/code><\/pre>\n<p>\u8981\u5c06\u9ca8\u9c7c\u6309\u76f8\u53cd\u7684\u987a\u5e8f\u6392\u5e8f\uff0c\u53ea\u9700\u53cd\u8f6c\u6bd4\u8f83\u5bf9\u8c61\u5373\u53ef\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Tiger\", \"Great White\", \"Hammerhead\", \"Angel\"]\r\nsorted_sharks = sharks.sort{|a,b| b &lt;=&gt; a }\r\nprint sorted_sharks<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c7\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<pre class=\"post-pre\"><code>[\"Tiger\", \"Hammerhead\", \"Great White\", \"Angel\"]<\/code><\/pre>\n<p>\u5f53\u6570\u7ec4\u5305\u542b\u7b80\u5355\u6570\u636e\u7c7b\u578b\uff08\u5982\u6574\u6570\u3001\u6d6e\u70b9\u6570\u548c\u5b57\u7b26\u4e32\uff09\u65f6\uff0c\u6392\u5e8f\u65b9\u6cd5\u975e\u5e38\u597d\u7528\u3002\u4f46\u662f\uff0c\u5f53\u6570\u7ec4\u5305\u542b\u66f4\u590d\u6742\u7684\u5bf9\u8c61\u65f6\uff0c\u4f60\u9700\u8981\u505a\u66f4\u591a\u7684\u5de5\u4f5c\u3002<\/p>\n<p>\u8fd9\u662f\u4e00\u4e2a\u6563\u5217\u6570\u7ec4\uff0c\u6bcf\u4e2a\u6563\u5217\u4ee3\u8868\u4e00\u6761\u9ca8\u9c7c\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\r\n{:name: \"Hammerhead\"},\r\n{:name: \"Great white\"},\r\n{:name: \"Angel\"}\r\n]<\/code><\/pre>\n<p>\u7528 <code>sort<\/code> \u5bf9\u8fd9\u4e2a\u8fdb\u884c\u6392\u5e8f\u5e76\u4e0d\u5bb9\u6613\u3002\u5bf9\u6570\u7ec4\u8c03\u7528 <code>sort<\/code> \u65b9\u6cd5\u5931\u8d25\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks.sort<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>ArgumentError: comparison of Hash with Hash failed<\/code><\/pre>\n<p>\u4e3a\u4e86\u8fdb\u884c\u6bd4\u8f83\uff0c\u6211\u4eec\u9700\u8981\u544a\u8bc9\u6392\u5e8f\u51fd\u6570\u6211\u4eec\u60f3\u8981\u6bd4\u8f83\u7684\u5185\u5bb9\u3002\u56e0\u6b64\uff0c\u6211\u4eec\u5c06\u6bd4\u8f83\u54c8\u5e0c\u8868\u4e2d\u201c:name\u201d\u952e\u7684\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>sorted_sharks.sort{|a, b| a[:name] &lt;=&gt; b[:name]}\r\nprint sorted_sharks<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[{:name=&gt;\"Angel\"}, {:name=&gt;\"Great white\"}, {:name=&gt;\"Hammerhead\"}]<\/code><\/pre>\n<p>\u5f53\u4f60\u5904\u7406\u66f4\u590d\u6742\u7684\u7ed3\u6784\u65f6\uff0c\u4f60\u53ef\u80fd\u60f3\u8003\u8651\u4f7f\u7528 <code>sort_by<\/code> \u65b9\u6cd5\uff0c\u5b83\u4f7f\u7528\u4e86\u66f4\u9ad8\u6548\u7684\u6392\u5e8f\u7b97\u6cd5\u3002<code>sort_by<\/code> \u65b9\u6cd5\u63a5\u53d7\u4e00\u4e2a\u53ea\u9700\u8981\u4e00\u4e2a\u53c2\u6570\u7684\u5757\uff0c\u8be5\u53c2\u6570\u662f\u6570\u7ec4\u4e2d\u5f53\u524d\u5143\u7d20\u7684\u5f15\u7528\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\r\n{:name: \"Hammerhead\"},\r\n{:name: \"Great white\"},\r\n{:name: \"Angel\"}\r\n]\r\n\r\nsorted_sharks = sharks.sort_by{|shark| shark[:name] }\r\nprint sorted_sharks<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>[{:name=&gt;\"Angel\"}, {:name=&gt;\"Great white\"}, {:name=&gt;\"Hammerhead\"}]<\/code><\/pre>\n<p><code>sort_by<\/code> \u65b9\u6cd5\u5b9e\u73b0\u4e86\u4e00\u79cd Schwartzian \u8f6c\u6362\uff0c\u8fd9\u662f\u4e00\u79cd\u6700\u9002\u5408\u6839\u636e\u7279\u5b9a\u952e\u7684\u503c\u6bd4\u8f83\u5bf9\u8c61\u7684\u6392\u5e8f\u7b97\u6cd5\u3002\u56e0\u6b64\uff0c\u5f53\u6bd4\u8f83\u5bf9\u8c61\u96c6\u5408\u65f6\uff0c\u60a8\u4f1a\u53d1\u73b0\u81ea\u5df1\u66f4\u9891\u7e41\u5730\u4f7f\u7528 <code>sort_by<\/code>\uff0c\u56e0\u4e3a\u5b83\u66f4\u9ad8\u6548\u3002<\/p>\n<p>\u65e0\u8bba\u662f <code>sort<\/code> \u8fd8\u662f <code>sort_by<\/code> \u90fd\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684\u6570\u7ec4\uff0c\u539f\u59cb\u6570\u7ec4\u4fdd\u6301\u4e0d\u53d8\u3002\u5982\u679c\u4f60\u60f3\u4fee\u6539\u539f\u59cb\u6570\u7ec4\uff0c\u8bf7\u4f7f\u7528 <code>sort!<\/code> \u548c <code>sort_by!<\/code>\u3002<\/p>\n<p>\u9664\u4e86\u5bf9\u6570\u503c\u8fdb\u884c\u6392\u5e8f\u5916\uff0c\u60a8\u53ef\u80fd\u8fd8\u60f3\u8981\u53bb\u9664\u91cd\u590d\u9879\u3002<\/p>\n<h2>\u5220\u9664\u91cd\u590d\u5143\u7d20<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c8\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: \u6709\u65f6\u4f60\u4f1a\u9047\u5230\u5305\u542b\u91cd\u590d\u6570\u636e\u7684\u6570\u636e\u5217\u8868\u3002\u867d\u7136\u4f60\u53ef\u4ee5\u901a\u8fc7\u904d\u5386\u6570\u7ec4\u6765\u8fc7\u6ee4\u6389\u91cd\u590d\u9879\uff0c\u4f46 Ruby \u7684 <code>uniq<\/code> \u65b9\u6cd5\u80fd\u8ba9\u8fd9\u4e2a\u8fc7\u7a0b\u53d8\u5f97\u5f02\u5e38\u7b80\u5355\u3002<code>uniq<\/code> \u65b9\u6cd5\u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u5176\u4e2d\u6240\u6709\u91cd\u590d\u7684\u503c\u90fd\u5df2\u88ab\u79fb\u9664\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"token punctuation\">[<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">2<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">4<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">1<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">5<\/span><span class=\"token punctuation\">,<\/span><span class=\"token number\">3<\/span><span class=\"token punctuation\">]<\/span><span class=\"token punctuation\">.<\/span>uniq <span class=\"token comment\"># [1,2,3,4,5]<\/span>\r\n<\/code><\/pre>\n<p>\u6709\u65f6\uff0c\u5728\u5408\u5e76\u4e24\u7ec4\u6570\u636e\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0\u91cd\u590d\u9879\u3002\u4ee5\u8fd9\u4e24\u7ec4\u9ca8\u9c7c\u6570\u7ec4\u4e3a\u4f8b\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Great White\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nnew_sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Hammerhead\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\n<\/code><\/pre>\n<p>\u5982\u679c\u6211\u4eec\u5c06\u5b83\u4eec\u76f4\u63a5\u76f8\u52a0\uff0c\u5c31\u4f1a\u5f97\u5230\u91cd\u590d\u7684\u6761\u76ee\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">+<\/span> new_sharks\r\n<span class=\"token comment\"># [\"Tiger\", \"Great White\", \"Tiger\", \"Hammerhead\"]<\/span>\r\n<\/code><\/pre>\n<p>\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>uniq<\/code> \u65b9\u6cd5\u6765\u5220\u9664\u91cd\u590d\u9879\uff0c\u4f46\u66f4\u597d\u7684\u505a\u6cd5\u662f\u5b8c\u5168\u907f\u514d\u5f15\u5165\u5b83\u4eec\u3002\u4e0d\u8981\u5c06\u6570\u7ec4\u76f8\u52a0\uff0c\u800c\u662f\u4f7f\u7528\u7ba1\u9053\u64cd\u4f5c\u7b26 <code>|<\/code> \u5c06\u6570\u7ec4\u5408\u5e76\u5728\u4e00\u8d77\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">|<\/span> new_sharks\r\n<span class=\"token comment\"># [\"Tiger\", \"Great White\", \"Hammerhead\"]<\/span>\r\n<\/code><\/pre>\n<p>Ruby \u6570\u7ec4\u8fd8\u652f\u6301\u51cf\u6cd5\u64cd\u4f5c\uff0c\u8fd9\u610f\u5473\u7740\u4f60\u53ef\u4ee5\u4ece <code>sharks<\/code> \u6570\u7ec4\u4e2d\u51cf\u53bb <code>new_sharks<\/code> \u6570\u7ec4\uff0c\u4ece\u800c\u53ea\u5f97\u5230\u65b0\u7684\u6216\u4e0d\u91cd\u590d\u7684\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Great White\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nnew_sharks <span class=\"token operator\">=<\/span> <span class=\"token punctuation\">[<\/span><span class=\"token string-literal\"><span class=\"token string\">\"Tiger\"<\/span><\/span><span class=\"token punctuation\">,<\/span> <span class=\"token string-literal\"><span class=\"token string\">\"Hammerhead\"<\/span><\/span><span class=\"token punctuation\">]<\/span>\r\nsharks <span class=\"token operator\">-<\/span> new_sharks <span class=\"token comment\"># [\"Great White\"]<\/span>\r\n<\/code><\/pre>\n<h2>\u6570\u636e\u8f6c\u6362<\/h2>\n<p>\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u64cd\u4f5c\u6bcf\u4e2a\u5143\u7d20\u7684\u503c\u3002<\/p>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c9\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<p><code>map<\/code> \u65b9\u6cd5\u53ca\u5176\u522b\u540d <code>collect<\/code> \u53ef\u4ee5\u5bf9\u6570\u7ec4\u5185\u5bb9\u8fdb\u884c\u8f6c\u6362\uff0c\u5373\u5bf9\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u64cd\u4f5c\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528 <code>map<\/code> \u51fd\u6570\u5bf9\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u8fdb\u884c\u7b97\u672f\u8fd0\u7b97\uff0c\u5e76\u521b\u5efa\u4e00\u4e2a\u5305\u542b\u65b0\u503c\u7684\u65b0\u6570\u7ec4\u3002<\/p>\n<pre class=\"post-pre\"><code>numbers = [2,4,6,8]\r\n\r\n# \u8ba1\u7b97\u6bcf\u4e2a\u6570\u5b57\u7684\u5e73\u65b9\r\nsquared_numbers = numbers.map {|number| number * number}\r\n\r\nprint squared_numbers\r\n<\/code><\/pre>\n<p><code>squared_numbers<\/code> \u53d8\u91cf\u662f\u539f\u59cb\u6570\u5b57\u7684\u5e73\u65b9\u6570\u7ec4\u3002<\/p>\n<pre class=\"post-pre\"><code>[4, 16, 36, 64]\r\n<\/code><\/pre>\n<p>\u5728 Web \u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c<code>map<\/code> \u7ecf\u5e38\u7528\u4e8e\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a HTML \u4e0b\u62c9\u5217\u8868\u4e2d\u7684\u5143\u7d20\u3002\u8fd9\u662f\u4e00\u4e2a\u975e\u5e38\u7b80\u5316\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5177\u4f53\u7684\u5b9e\u73b0\u65b9\u5f0f\u3002<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\n\r\noptions = sharks.map {|shark| \"&lt;option&gt;#{shark}&lt;\/option&gt;\"}\r\n\r\nprint options\r\n<\/code><\/pre>\n<p>\u73b0\u5728\uff0c<code>options<\/code> \u6570\u7ec4\u4e2d\u7684\u6bcf\u4e2a\u9ca8\u9c7c\u540d\u79f0\u90fd\u88ab\u5305\u88f9\u5728 HTML \u6807\u7b7e\u4e2d\u3002<\/p>\n<pre class=\"post-pre\"><code>[\"&lt;option&gt;Hammerhead&lt;\/option&gt;\", \"&lt;option&gt;Great White&lt;\/option&gt;\", \"&lt;option&gt;Tiger&lt;\/option&gt;\", \"&lt;option&gt;Whale&lt;\/option&gt;\"]\r\n<\/code><\/pre>\n<p>\u4f7f\u7528 <code>map<\/code> \u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u800c\u4e0d\u4f1a\u4fee\u6539\u539f\u59cb\u6570\u7ec4\u3002\u4f7f\u7528 <code>map!<\/code> \u5219\u4f1a\u4fee\u6539\u73b0\u6709\u6570\u7ec4\u3002\u540c\u65f6\uff0c\u8bf7\u8bb0\u4f4f <code>map<\/code> \u6709\u4e00\u4e2a\u540d\u4e3a <code>collect<\/code> \u7684\u522b\u540d\u3002\u5728\u60a8\u7684\u4ee3\u7801\u4e2d\u5e94\u8be5\u4fdd\u6301\u4e00\u81f4\uff0c\u53ea\u4f7f\u7528\u5176\u4e2d\u4e00\u4e2a\u3002<\/p>\n<p>\u7531\u4e8e <code>map<\/code> \u51fd\u6570\u8fd4\u56de\u4e00\u4e2a\u65b0\u6570\u7ec4\uff0c\u8fd9\u4e2a\u6570\u7ec4\u53ef\u4ee5\u8fdb\u4e00\u6b65\u8fdb\u884c\u8f6c\u6362\u548c\u64cd\u4f5c\uff0c\u751a\u81f3\u53ef\u4ee5\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002\u63a5\u4e0b\u6765\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u8fd9\u4e2a\u3002<\/p>\n<h2>\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32<\/h2>\n<p>\u5728 Ruby \u4e2d\uff0c\u6240\u6709\u5bf9\u8c61\u90fd\u6709\u4e00\u4e2a <code>to_s<\/code> \u65b9\u6cd5\uff0c\u7528\u4e8e\u5c06\u5bf9\u8c61\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u3002\u8fd9\u5c31\u662f <code>print<\/code> \u8bed\u53e5\u6240\u4f7f\u7528\u7684\u65b9\u6cd5\u3002\u8003\u8651\u5230\u6211\u4eec\u7684\u9ca8\u9c7c\u6570\u7ec4\uff1a<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\n<\/code><\/pre>\n<p>\u8c03\u7528 <code>to_s<\/code> \u65b9\u6cd5\u4f1a\u521b\u5efa\u4ee5\u4e0b\u5b57\u7b26\u4e32\uff1a<\/p>\n<pre class=\"post-pre\"><code>\"[\\\"Hammerhead\\\", \\\"Great White\\\", \\\"Tiger\\\", \\\"Whale\\\"]\"\r\n<\/code><\/pre>\n<p>\u8fd9\u5bf9\u4e8e\u8c03\u8bd5\u6765\u8bf4\u5f88\u597d\uff0c\u4f46\u5728\u4e00\u4e2a\u771f\u6b63\u7684\u7a0b\u5e8f\u4e2d\u5e76\u4e0d\u662f\u975e\u5e38\u6709\u7528\u3002<\/p>\n<p><code>join<\/code> \u65b9\u6cd5\u53ef\u4ee5\u5c06\u4e00\u4e2a\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u540c\u65f6\u8fd8\u53ef\u4ee5\u8ba9\u60a8\u66f4\u597d\u5730\u63a7\u5236\u5982\u4f55\u7ec4\u5408\u5143\u7d20\u3002<code>join<\/code> \u65b9\u6cd5\u9700\u8981\u4e00\u4e2a\u53c2\u6570\u6765\u6307\u5b9a\u60a8\u5e0c\u671b\u7528\u4f5c\u5206\u9694\u7b26\u7684\u5b57\u7b26\u3002\u8981\u5c06\u4e00\u4e2a\u9ca8\u9c7c\u6570\u7ec4\u8f6c\u6362\u4e3a\u7531\u7a7a\u683c\u5206\u9694\u7684\u9ca8\u9c7c\u540d\u79f0\u5b57\u7b26\u4e32\uff0c\u60a8\u53ef\u4ee5\u50cf\u8fd9\u6837\u64cd\u4f5c\uff1a<\/p>\n<div>\u9ca8\u9c7c\u52a0\u5165.rb<\/p>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresult = sharks.join(\" \")\r\nprint result\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Hammerhead Great White Tiger Whale\r\n<\/code><\/pre>\n<\/div>\n<p>\u5982\u679c\u60a8\u60f3\u8ba9\u6bcf\u4e2a\u9ca8\u9c7c\u540d\u79f0\u7528\u9017\u53f7\u548c\u7a7a\u683c\u5206\u9694\uff0c\u90a3\u4e48\u8bf7\u4f7f\u7528\u9017\u53f7\u548c\u7a7a\u683c\u4f5c\u4e3a\u5206\u9694\u7b26\u3002<\/p>\n<div>\u9ca8\u9c7c\u52a0\u5165.rb<\/div>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresult = sharks.join(\", \")\r\nprint result\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>Hammerhead, Great White, Tiger, Whale\r\n<\/code><\/pre>\n<p>\u5982\u679c\u60a8\u5728<code>join<\/code>\u65b9\u6cd5\u4e2d\u4e0d\u6307\u5b9a\u53c2\u6570\uff0c\u4ecd\u7136\u4f1a\u5f97\u5230\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u4f46\u5b83\u4e0d\u4f1a\u6709\u4efb\u4f55\u5206\u9694\u7b26\u3002<\/p>\n<div>\u9ca8\u9c7c\u52a0\u5165.rb<\/div>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\nresult = sharks.join\r\nprint result\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>HammerheadGreat WhiteTigerWhale\r\n<\/code><\/pre>\n<p>\u5c06<code>join<\/code>\u65b9\u6cd5\u4e0e<code>map<\/code>\u65b9\u6cd5\u7ed3\u5408\u4f7f\u7528\uff0c\u662f\u5feb\u901f\u5c06\u6570\u636e\u6570\u7ec4\u8f6c\u6362\u4e3a\u8f93\u51fa\u5b57\u7b26\u4e32\u7684\u6709\u6548\u65b9\u5f0f\u3002\u9996\u5148\u4f7f\u7528<code>map<\/code>\u8f6c\u6362\u6570\u636e\u4e2d\u7684\u6bcf\u4e2a\u5143\u7d20\uff0c\u7136\u540e\u4f7f\u7528<code>join<\/code>\u5c06\u6574\u4e2a\u6570\u7ec4\u8f6c\u6362\u4e3a\u53ef\u6253\u5370\u7684\u5b57\u7b26\u4e32\u3002\u8fd8\u8bb0\u5f97\u6211\u4eec\u5c06<code>sharks<\/code>\u6570\u7ec4\u8f6c\u6362\u4e3aHTML\u5143\u7d20\u6570\u7ec4\u7684\u4f8b\u5b50\u5417\uff1f\u8fd9\u6b21\u6211\u4eec\u5c06\u4f7f\u7528<code>join<\/code>\u5c06\u5143\u7d20\u6570\u7ec4\u8f6c\u6362\u4e3a\u4e00\u4e2a\u4ee5\u6362\u884c\u7b26\u4f5c\u4e3a\u5206\u9694\u7b26\u7684\u5b57\u7b26\u4e32\u3002<\/p>\n<div>map.rb &#8212;&gt; map.rb<\/div>\n<pre class=\"post-pre\"><code>sharks = [\"Hammerhead\", \"Great White\", \"Tiger\", \"Whale\"]\r\noptions = sharks.map { |shark| \"&lt;option&gt;#{shark}&lt;\/option&gt;\" }\r\noutput = options.join(\"\\n\")\r\nprint output\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/div>\n<pre class=\"post-pre\"><code>&lt;option&gt;Hammerhead&lt;\/option&gt;\r\n&lt;option&gt;Great White&lt;\/option&gt;\r\n&lt;option&gt;Tiger&lt;\/option&gt;\r\n&lt;option&gt;Whale&lt;\/option&gt;\r\n<\/code><\/pre>\n<p>\u9664\u4e86\u5c06\u6570\u7ec4\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff0c\u60a8\u53ef\u80fd\u8fd8\u5e0c\u671b\u83b7\u53d6\u5176\u603b\u548c\u6216\u8fdb\u884c\u5176\u4ed6\u7c7b\u578b\u7684\u8f6c\u6362\uff0c\u4ee5\u83b7\u5f97\u4e00\u4e2a\u5355\u4e00\u7684\u6570\u503c\u3002\u63a5\u4e0b\u6765\u6211\u4eec\u5c06\u63a2\u8ba8\u8fd9\u4e00\u70b9\u3002<\/p>\n<h2>\u5c06\u6570\u7ec4\u7f29\u51cf\u4e3a\u5355\u4e00\u503c<\/h2>\n<p>\u8fd9\u662f\u6587\u7ae0\u300a\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4\u65b9\u6cd5\u300b\u7684\u7b2c11\u90e8\u5206\uff08\u517112\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5f53\u60a8\u5904\u7406\u4e00\u7ec4\u6570\u636e\u65f6\uff0c\u7ecf\u5e38\u9700\u8981\u5c06\u6570\u636e\u201c\u6298\u53e0\u201d\u6210\u4e00\u4e2a\u5355\u4e00\u7684\u503c\uff0c\u4f8b\u5982\u8ba1\u7b97\u603b\u548c\u3002\u4f20\u7edf\u4e0a\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4f7f\u7528\u53d8\u91cf\u548c<code>each<\/code>\u65b9\u6cd5\u6765\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002<\/p>\n<pre class=\"post-pre\"><code>result = 0\r\n[1, 2, 3].each {|num| result += num}\r\nprint result\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code>6\r\n<\/code><\/pre>\n<\/div>\n<p>\u7136\u800c\uff0cRuby \u63d0\u4f9b\u4e86\u66f4\u7b80\u6d01\u3001\u529f\u80fd\u66f4\u5f3a\u5927\u7684<code>reduce<\/code>\u65b9\u6cd5\uff08\u4e5f\u79f0\u4e3a<code>inject<\/code>\uff09\uff0c\u5b83\u53ef\u4ee5\u66ff\u4ee3\u4e0a\u8ff0\u505a\u6cd5\u3002<code>reduce<\/code>\u65b9\u6cd5\u4f1a\u904d\u5386\u6570\u7ec4\uff0c\u5e76\u901a\u8fc7\u5bf9\u6bcf\u4e2a\u5143\u7d20\u6267\u884c\u4e00\u4e2a\u4e8c\u5143\u64cd\u4f5c\u6765\u7ef4\u62a4\u4e00\u4e2a\u7d2f\u52a0\u503c\u3002<\/p>\n<p><code>reduce<\/code>\u65b9\u6cd5\u53ef\u4ee5\u63a5\u53d7\u4e00\u4e2a\u521d\u59cb\u503c\u4f5c\u4e3a\u7d2f\u52a0\u7684\u8d77\u70b9\uff0c\u5e76\u4e14\u5176\u4ee3\u7801\u5757\uff08block\uff09\u5305\u542b\u4e24\u4e2a\u5c40\u90e8\u53d8\u91cf\uff1a\u4e00\u4e2a\u662f\u5bf9\u7d2f\u52a0\u7ed3\u679c\u7684\u5f15\u7528\uff0c\u53e6\u4e00\u4e2a\u662f\u5bf9\u5f53\u524d\u5143\u7d20\u7684\u5f15\u7528\u3002\u5728\u4ee3\u7801\u5757\u5185\u90e8\uff0c\u60a8\u53ef\u4ee5\u5b9a\u4e49\u8ba1\u7b97\u6700\u7ec8\u7ed3\u679c\u7684\u903b\u8f91\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e3a\u4e86\u5bf9\u6570\u7ec4\u8fdb\u884c\u6c42\u548c\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u521d\u59cb\u503c\u8bbe\u7f6e\u4e3a<code>0<\/code>\uff0c\u7136\u540e\u5728\u4ee3\u7801\u5757\u4e2d\u5c06\u5f53\u524d\u5143\u7d20\u7684\u503c\u52a0\u5230\u7d2f\u52a0\u7ed3\u679c\u4e0a\u3002<\/p>\n<pre class=\"post-pre\"><code>output = [1,2,3].reduce(0) {|result, current| result += current }\r\nprint output\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code>6\r\n<\/code><\/pre>\n<\/div>\n<p>\u5982\u679c\u60a8\u6253\u7b97\u5c06\u7d2f\u52a0\u7ed3\u679c\u521d\u59cb\u5316\u4e3a<code>0<\/code>\uff0c\u53ef\u4ee5\u7701\u7565<code>reduce<\/code>\u65b9\u6cd5\u7684\u521d\u59cb\u53c2\u6570\uff0c\u53ea\u4f20\u9012\u4ee3\u7801\u5757\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c<code>reduce<\/code>\u65b9\u6cd5\u4f1a\u81ea\u52a8\u5c06\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u4f5c\u4e3a\u521d\u59cb\u503c\u3002<\/p>\n<pre class=\"post-pre\"><code>output = [1,2,3].reduce {|result, current| result += current }\r\nprint output\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code>6\r\n<\/code><\/pre>\n<\/div>\n<p><code>reduce<\/code>\u65b9\u6cd5\u8fd8\u5141\u8bb8\u60a8\u901a\u8fc7\u4f20\u9012\u4e00\u4e2a\u7b26\u53f7\u6765\u6307\u5b9a\u4e00\u4e2a\u4e8c\u5143\u65b9\u6cd5\uff08\u5373\u63a5\u53d7\u53e6\u4e00\u4e2a\u5bf9\u8c61\u4f5c\u4e3a\u53c2\u6570\u7684\u65b9\u6cd5\uff09\uff0c\u5e76\u5728\u6570\u7ec4\u7684\u6bcf\u4e2a\u5143\u7d20\u4e0a\u6267\u884c\u8be5\u65b9\u6cd5\u3002\u7136\u540e\uff0c<code>reduce<\/code>\u65b9\u6cd5\u4f1a\u5229\u7528\u8fd9\u4e9b\u64cd\u4f5c\u7684\u7ed3\u679c\u6765\u751f\u6210\u4e00\u4e2a\u5355\u4e00\u7684\u6700\u7ec8\u503c\u3002<\/p>\n<p>\u5728 Ruby \u4e2d\uff0c\u5f53\u60a8\u5199<code>2 + 2<\/code>\u65f6\uff0c\u5b9e\u9645\u4e0a\u662f\u5728\u6574\u6570<code>2<\/code>\u4e0a\u8c03\u7528\u4e86<code>+<\/code>\u65b9\u6cd5\u3002<\/p>\n<pre class=\"post-pre\"><code>2.+(2) # 4\r\n<\/code><\/pre>\n<p>Ruby \u4f7f\u7528\u4e86\u4e00\u4e9b\u8bed\u6cd5\u7cd6\uff0c\u4f7f\u5f97\u60a8\u53ef\u4ee5\u66f4\u7b80\u6d01\u5730\u5c06\u5176\u8868\u793a\u4e3a<code>2 + 2<\/code>\u3002<\/p>\n<p><code>reduce<\/code>\u65b9\u6cd5\u5141\u8bb8\u901a\u8fc7\u4f20\u9012\u65b9\u6cd5\u540d\u79f0\u7684\u7b26\u53f7\u5f62\u5f0f\u6765\u6307\u5b9a\u4e8c\u5143\u65b9\u6cd5\u3002\u8fd9\u610f\u5473\u7740\u60a8\u53ef\u4ee5\u5c06<code>:+<\/code>\u4f20\u9012\u7ed9<code>reduce<\/code>\u65b9\u6cd5\uff0c\u4ece\u800c\u7b80\u6d01\u5730\u5b9e\u73b0\u6570\u7ec4\u6c42\u548c\u3002<\/p>\n<pre class=\"post-pre\"><code>output = [1, 2, 3].reduce(:+)\r\nprint output\r\n<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa<\/p>\n<pre class=\"post-pre\"><code>6\r\n<\/code><\/pre>\n<\/div>\n<p>\u5c3d\u7ba1<code>reduce<\/code>\u65b9\u6cd5\u5e38\u7528\u4e8e\u5bf9\u5217\u8868\u4e2d\u7684\u6570\u5b57\u8fdb\u884c\u6c42\u548c\uff0c\u4f46\u5b83\u4e5f\u53ef\u4ee5\u7528\u4e8e\u8f6c\u6362\u6570\u503c\u3002\u8bf7\u8bb0\u4f4f\uff0c<code>reduce<\/code>\u7684\u76ee\u7684\u662f\u5c06\u6570\u7ec4\u201c\u7f29\u51cf\u201d\u4e3a\u5355\u4e2a\u503c\uff0c\u4f46\u8fd9\u4e2a\u201c\u5355\u4e2a\u503c\u201d\u5e76\u6ca1\u6709\u89c4\u5b9a\u4e0d\u80fd\u662f\u53e6\u4e00\u4e2a\u6570\u7ec4\u3002<\/p>\n<p>\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u5305\u542b\u5404\u79cd\u7c7b\u578b\u503c\u7684\u5217\u8868\uff0c\u6211\u4eec\u9700\u8981\u5c06\u5176\u4e2d\u7684\u6709\u6548\u6570\u5b57\u8f6c\u6362\u4e3a\u6574\u6570\uff0c\u5e76\u8fc7\u6ee4\u6389\u65e0\u6cd5\u8f6c\u6362\u7684\u503c\u3002<\/p>\n<p>\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528<code>reject<\/code>\u65b9\u6cd5\u6392\u9664\u975e\u6570\u5b57\u503c\uff0c\u7136\u540e\u4f7f\u7528<code>map<\/code>\u65b9\u6cd5\u5c06\u5269\u4f59\u7684\u503c\u8f6c\u6362\u4e3a\u6574\u6570\u3002\u4f46\u66f4\u9ad8\u6548\u7684\u65b9\u5f0f\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u4e00\u6b65\u5230\u4f4d\u5730\u4f7f\u7528<code>reduce<\/code>\u65b9\u6cd5\u6765\u5b8c\u6210\u6240\u6709\u64cd\u4f5c\u3002\u4e0b\u9762\u662f\u5177\u4f53\u7684\u65b9\u6cd5\uff1a<\/p>\n<p>\u9996\u5148\uff0c\u4f7f\u7528\u4e00\u4e2a\u7a7a\u6570\u7ec4\u4f5c\u4e3a<code>reduce<\/code>\u65b9\u6cd5\u7684\u521d\u59cb\u503c\u3002\u7136\u540e\uff0c\u5728\u4ee3\u7801\u5757\u4e2d\uff0c\u5c1d\u8bd5\u4f7f\u7528<code>Integer()<\/code>\u65b9\u6cd5\u5c06\u5f53\u524d\u503c\u8f6c\u6362\u4e3a\u6574\u6570\u3002\u5982\u679c\u503c\u65e0\u6cd5\u8f6c\u6362\u4e3a\u6574\u6570\uff0c<code>Integer()<\/code>\u65b9\u6cd5\u4f1a\u629b\u51fa\u5f02\u5e38\uff0c\u60a8\u53ef\u4ee5\u6355\u83b7\u8be5\u5f02\u5e38\u5e76\u5c06\u503c\u8bbe\u7f6e\u4e3a<code>nil<\/code>\u3002<\/p>\n<p>\u6700\u540e\uff0c\u5c06\u8fd9\u4e2a\u8f6c\u6362\u540e\u7684\u503c\u6dfb\u52a0\u5230\u7d2f\u52a0\u6570\u7ec4\u4e2d\uff0c\u4f46\u4ec5\u5f53\u5b83\u4e0d\u662f<code>nil<\/code>\u65f6\u624d\u6dfb\u52a0\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u5b9e\u73b0\u6b64\u529f\u80fd\u7684\u4ee3\u7801\u793a\u4f8b\u3002\u8bf7\u5c1d\u8bd5\u8fd0\u884c\u5b83\uff1a<\/p>\n<p><code>\u8f6c\u6362_value_\u6570\u7ec4.rb<\/code><\/p>\n<pre class=\"post-pre\"><code>values = [\"1\", \"2\", \"a\", \"3\"]\r\nintegers = values.reduce([]) do |array, current|\r\n  val = Integer(current) rescue nil\r\n  array.push(val) unless val.nil?\r\n  array\r\nend\r\nprint integers<\/code><\/pre>\n<div class=\"secondary-code-label\" title=\"Output\">\u8f93\u51fa\u7ed3\u679c<\/p>\n<pre class=\"post-pre\"><code>[1, 2, 3]<\/code><\/pre>\n<\/div>\n<p>\u5f53\u4f60\u9700\u8981\u5c06\u4e00\u7ec4\u5143\u7d20\u5217\u8868\u8f6c\u6362\u4e3a\u5355\u4e2a\u503c\u65f6\uff0c\u901a\u5e38\u53ef\u4ee5\u4f7f\u7528 <code>reduce<\/code> \u65b9\u6cd5\u6765\u89e3\u51b3\u3002<\/p>\n<h2>\u7ed3\u8bba<\/h2>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u4f60\u5b66\u4e60\u4e86\u591a\u79cd\u5904\u7406\u6570\u7ec4\u7684\u65b9\u6cd5\u3002\u4f60\u638c\u63e1\u4e86\u5982\u4f55\u83b7\u53d6\u5355\u4e2a\u5143\u7d20\u3001\u901a\u8fc7\u641c\u7d22\u6570\u7ec4\u68c0\u7d22\u503c\u3001\u5bf9\u5143\u7d20\u8fdb\u884c\u6392\u5e8f\uff0c\u4ee5\u53ca\u8f6c\u6362\u6570\u636e\u4ee5\u521b\u5efa\u65b0\u7684\u6570\u7ec4\u3001\u5b57\u7b26\u4e32\u548c\u603b\u548c\u3002\u4f60\u53ef\u4ee5\u8fd0\u7528\u8fd9\u4e9b\u6982\u5ff5\u6765\u89e3\u51b3\u8bb8\u591a\u5e38\u89c1\u7684 Ruby \u7f16\u7a0b\u95ee\u9898\u3002<\/p>\n<p>\u8bf7\u52a1\u5fc5\u67e5\u770b\u4ee5\u4e0b\u76f8\u5173\u6559\u7a0b\uff0c\u4ee5\u7ee7\u7eed\u63a2\u7d22\u5982\u4f55\u5728 Ruby \u4e2d\u5904\u7406\u6570\u636e\uff1a<\/p>\n<ul class=\"post-ul\">\n<li><a href=\"#\">\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u5b57\u7b26\u4e32<\/a><\/li>\n<li><a href=\"#\">\u5982\u4f55\u5728 Ruby \u4e2d\u4f7f\u7528\u6570\u7ec4<\/a><\/li>\n<li><a href=\"#\">\u7406\u89e3 Ruby \u4e2d\u7684\u6570\u636e\u7c7b\u578b<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u7b80\u4ecb \u6570\u7ec4\u53ef\u4ee5\u5728\u7a0b\u5e8f\u4e2d\u8868\u793a\u6570\u636e\u5217\u8868\u3002\u4e00\u65e6\u60a8\u6709\u4e86\u6570\u7ec4\u4e2d\u7684\u6570\u636e\uff0c\u5c31\u53ef\u4ee5\u5bf9\u5176\u8fdb\u884c\u6392\u5e8f\u3001\u53bb\u9664\u91cd\u590d\u9879\u3001\u53cd\u8f6c\u987a\u5e8f\u3001\u63d0\u53d6\u6570\u7ec4 [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[258,276,391,390,184],"class_list":{"0":"post-59","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-uncategorized","7":"tag-ruby","9":"tag-391","10":"tag-390","11":"tag-184"},"yoast_head":"<!-- This site is optimized with the 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