{"id":2630,"date":"2022-05-28T10:57:20","date_gmt":"2022-05-28T02:57:20","guid":{"rendered":"https:\/\/jimmyswebnote.com\/?p=2630"},"modified":"2022-06-02T09:52:29","modified_gmt":"2022-06-02T01:52:29","slug":"ruby-string-object","status":"publish","type":"post","link":"https:\/\/jimmyswebnote.com\/ruby-string-object\/","title":{"rendered":"Ruby \u6559\u5b78 5 &#8211; Ruby String Object \u4ecb\u7d39"},"content":{"rendered":"\n<p>Ruby String object \u662f\u6700\u5e38\u7528\u5230\u7684 object \u4e4b\u4e00\uff0c\u5e38\u7528 &#8220;&#8221; \u4f86\u5ba3\u544a\uff0c\u9019\u7bc7\u5c31\u4f86\u6574\u7406\u4e26\u4ecb\u7d39\u4e00\u4e0b Ruby String object \u7684\u7279\u6027\u548c\u5e38\u7528\u7684 methods \u5427\uff01<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_65 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-663351ab3b477\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-663351ab3b477\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#1_%E5%AE%A3%E5%91%8A_Ruby_String_Object\" title=\"1. \u5ba3\u544a Ruby String Object\">1. \u5ba3\u544a Ruby String Object<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#11_Stringnew\" title=\"1.1 String.new\">1.1 String.new<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#111_encoding\" title=\"1.1.1 encoding\">1.1.1 encoding<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#112_capacity\" title=\"1.1.2 capacity\">1.1.2 capacity<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#12_%E2%80%9C%E2%80%9D\" title=\"1.2 &#8220;&#8221;\">1.2 &#8220;&#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#13_%E2%80%9D\" title=\"1.3 &#8221;\">1.3 &#8221;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#14_MLS\" title=\"1.4 MLS\">1.4 MLS<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#2_String_Instance_Methods_I_%E2%80%93_%E5%B1%AC%E6%80%A7\" title=\"2. String Instance Methods I &#8211; \u5c6c\u6027\">2. String Instance Methods I &#8211; \u5c6c\u6027<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#21_String_lengthsize\" title=\"2.1 String length\/size\">2.1 String length\/size<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#22_String_index\" title=\"2.2 String index\">2.2 String index<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#23_String_rindex\" title=\"2.3 String rindex\">2.3 String rindex<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#24_String_count\" title=\"2.4 String count\">2.4 String count<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#25_String_include\" title=\"2.5 String include?\">2.5 String include?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#26_String_empty\" title=\"2.6 String empty?\">2.6 String empty?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#3_String_Instance_Methods_II_%E2%80%93_%E6%93%8D%E4%BD%9C_%E4%B8%8D%E6%94%B9%E8%AE%8A%E5%8E%9F_Object\" title=\"3. String Instance Methods II &#8211; \u64cd\u4f5c (\u4e0d\u6539\u8b8a\u539f Object)\">3. String Instance Methods II &#8211; \u64cd\u4f5c (\u4e0d\u6539\u8b8a\u539f Object)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#31_String_upcase\" title=\"3.1 String upcase\">3.1 String upcase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#32_String_downcase\" title=\"3.2 String downcase\">3.2 String downcase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#33_String_capitalize\" title=\"3.3 String capitalize\">3.3 String capitalize<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#34_String_swapcase\" title=\"3.4 String swapcase\">3.4 String swapcase<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#35_String_slice\" title=\"3.5 String slice\">3.5 String slice<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#36_String_reverse\" title=\"3.6 String reverse\">3.6 String reverse<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#37_String_squeeze\" title=\"3.7 String squeeze\">3.7 String squeeze<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#38_String_delete\" title=\"3.8 String delete\">3.8 String delete<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#4_String_Instance_Methods_III_%E2%80%93_%E6%93%8D%E4%BD%9C_%E6%9C%83%E6%94%B9%E8%AE%8A%E5%8E%9F_object\" title=\"4. String Instance Methods III &#8211; \u64cd\u4f5c (\u6703\u6539\u8b8a\u539f object)\">4. String Instance Methods III &#8211; \u64cd\u4f5c (\u6703\u6539\u8b8a\u539f object)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#41\" title=\"4.1 &lt;&lt;\">4.1 &lt;&lt;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#42_String_concat\" title=\"4.2 String concat\">4.2 String concat<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#43_String_prepend\" title=\"4.3 String prepend\">4.3 String prepend<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#44_String_insert\" title=\"4.4 String insert\">4.4 String insert<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#45_String_clear\" title=\"4.5 String clear\">4.5 String clear<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#5_String_Instance_Methods_IV_%E2%80%93_%E8%BD%89%E6%8F%9B%E6%88%90%E5%85%B6%E4%BB%96_Object\" title=\"5. String Instance Methods IV &#8211; \u8f49\u63db\u6210\u5176\u4ed6 Object\">5. String Instance Methods IV &#8211; \u8f49\u63db\u6210\u5176\u4ed6 Object<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#51_String_split\" title=\"5.1 String split\">5.1 String split<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#52_String_to_i\" title=\"5.2 String to_i\">5.2 String to_i<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#53_String_to_f\" title=\"5.3 String to_f\">5.3 String to_f<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#54_String_to_sym\" title=\"5.4 String to_sym\">5.4 String to_sym<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#6_String_Instance_Methods_V_%E2%80%93_Iterate_String_Object\" title=\"6. String Instance Methods V &#8211; Iterate String Object\">6. String Instance Methods V &#8211; Iterate String Object<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#61_String_each_char\" title=\"6.1 String each_char\">6.1 String each_char<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-37\" href=\"https:\/\/jimmyswebnote.com\/ruby-string-object\/#7_%E5%8F%83%E8%80%83%E8%B3%87%E6%96%99\" title=\"7. \u53c3\u8003\u8cc7\u6599\">7. \u53c3\u8003\u8cc7\u6599<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"1_%E5%AE%A3%E5%91%8A_Ruby_String_Object\"><\/span>1. \u5ba3\u544a Ruby String Object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"11_Stringnew\"><\/span>1.1 String.new<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4e00\u6a23\u53ef\u4ee5\u7528 class.new \u7684\u65b9\u6cd5 new \u51fa\u4e00\u500b string object instance\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = String.new(\"Jimmy\")\np str\n# \"Jimmy\"<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"111_encoding\"><\/span>1.1.1 encoding<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>encoding \u662f String.new \u63d0\u4f9b\u7684\u5176\u4e2d\u4e00\u500b argument\uff0c\u7528\u4f86\u6c7a\u5b9a\u9019\u500b String object \u8981\u7528\u4ec0\u9ebc\u65b9\u5f0f encoding\uff0c\u5982\u679c String \u6c92\u6709\u4efb\u4f55 argument \u7684\u8a71\uff0c\u9810\u8a2d\u662f\u7528 ASCII-8BIT\uff0c\u4f46\u4e00\u65e6\u6709 argument\uff0c\u5247\u9810\u8a2d\u7528 UTF-8 encoding\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = String.new\nstr2 = String.new(\"Jimmy\")\np str1.encoding\n# #&lt;Encoding:ASCII-8BIT&gt;\np str2.encoding\n# #&lt;Encoding:UTF-8&gt;<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u76f4\u63a5\u5728 String.new \u5f8c\u9762\u63a5\u4e0a encoding \u4f86\u6c7a\u5b9a\u7de8\u78bc\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">s0 = String.new(\"\u4f60\u597d\", encoding: 'UTF-8')\ns1 = String.new(\"\u4f60\u597d\", encoding: 'ASCII')\np s0\n# \"\u4f60\u597d\"\np s1\n# \"\\xE4\\xBD\\xA0\\xE5\\xA5\\xBD\"<\/code><\/pre>\n\n\n\n<h4><span class=\"ez-toc-section\" id=\"112_capacity\"><\/span>1.1.2 capacity<span class=\"ez-toc-section-end\"><\/span><\/h4>\n\n\n\n<p>capacity \u662f String.new \u63d0\u4f9b\u7684\u53e6\u4e00\u500b argument\uff0c\u7528\u4f86\u6c7a\u5b9a internal buffer \u7684 size\uff0c\u6703\u5f71\u97ff\u5230\u6548\u80fd\uff0c\u4e0d\u904e document \u4e2d\u4e26\u6c92\u6709\u591a\u4f5c\u89e3\u91cb\uff0c\u4e5f\u6c92 google \u5230\u76f8\u95dc\u6587\u7ae0\uff0c\u5f85\u6211\u6709\u671d\u4e00\u65e5\u4fee\u6210\u6b63\u679c\u518d\u505a\u66f4\u6df1\u5165\u7684\u7814\u7a76\uff0c\u4ee5\u4e0b\u662f\u5b98\u65b9 document \u8209\u7684\u4f8b\u5b50\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = String.new(capacity: 1)\nstr2 = String.new(capacity: 1024)\np str1\n# \"\"\np str2\n# \"\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"12_%E2%80%9C%E2%80%9D\"><\/span>1.2 &#8220;&#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u53ef\u4ee5\u76f4\u63a5\u7528\u96d9\u5f15\u865f\u4f86\u5ba3\u544a String object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"\"\nstr2 = \"Jimmy\"\np str1\n# \"\"\np str2\n# \"Jimmy\"<\/code><\/pre>\n\n\n\n<p>\u5728\u96d9\u5f15\u865f\u4e2d\uff0c\u53ef\u4ee5\u63db\u884c\uff0c\u6216\u662f\u4f7f\u7528 String Interpolation \u5728 String \u4e2d\u63d2\u5165\u8b8a\u6578\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">age = 25\nstr = \"Jimmy\\nis #{age} years old!\"\n\nputs str\n# Jimmy\n# is 25 years old!<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"13_%E2%80%9D\"><\/span>1.3 &#8221;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4e5f\u53ef\u4ee5\u7528\u55ae\u5f15\u865f\u4f86\u5ba3\u544a String\uff0c\u548c\u96d9\u5f15\u865f\u7684\u5dee\u5225\u5728\u65bc\uff1a\u7279\u6b8a\u7b26\u865f\u3001\u63db\u884c\u3001String Interpolation \u90fd\u6703\u88ab\u8996\u70ba String\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">age = 25\nstr = 'Jimmy\\nis #{age} years old!'\n\nputs str\n# Jimmy\\nis #{age} years old!<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"14_MLS\"><\/span>1.4 MLS<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>MLS \u5e38\u7528\u4f86\u5ba3\u544a\u591a\u884c\u7684 String object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = &lt;&lt;MLS\nJimmy is 25 years old\nlive in Taipei\nis handsome\nMLS\n\nputs str\n# Jimmy is 25 years old\n# live in Taipei\n# is handsome<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"2_String_Instance_Methods_I_%E2%80%93_%E5%B1%AC%E6%80%A7\"><\/span>2. String Instance Methods I &#8211; \u5c6c\u6027<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6211\u628a String \u5e38\u7528\u7684 methods \u5206\u70ba 5 \u500b\u90e8\u5206\uff0c\u7b2c 1 \u90e8\u5206\u6bd4\u8f03\u504f\u5411 object \u7684 \u5c6c\u6027\uff0c\u7528\u4f86\u53d6\u5f97\u9019\u500b String object \u76f8\u95dc\u7684\u8cc7\u8a0a\u3002<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"21_String_lengthsize\"><\/span>2.1 String length\/size<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.length \u7528\u4f86\u53d6\u5f97\u5b57\u4e32\u7684\u9577\u5ea6\uff0c\u548c .size \u7684\u4f5c\u7528\u4e00\u6a23\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"Jimmy\"\n\np str.length\n# 5\np str.size\n# 5<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"22_String_index\"><\/span>2.2 String index<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.index \u53ef\u4ee5\u53d6\u5f97\u67d0\u500b\u5b57\u5143\u6216\u662f\u5b50\u5b57\u4e32\u5728 String object \u4e2d\u7684\u4f4d\u7f6e\uff0c\u82e5\u6c92\u6709\u7d66\u7b2c\u4e8c\u500b argument\uff0c\u5247\u56de\u50b3\u7b2c\u4e00\u500b\u7b26\u5408 argument \u7684 index\uff0c\u7b2c\u4e8c\u500b argument \u5247\u662f\u7528\u4f86\u6307\u5b9a\u8981\u5f9e\u54ea\u500b index \u958b\u59cb\u627e\uff0c\u5982\u679c\u6c92\u6709\u7b26\u5408 argument \u7684\u5b57\u4e32\uff0c\u5247\u56de\u50b3 nil\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.index(\"i\")\n# 1\np str1.index(\"ha\")\n# 9\np str1.index(\"H\")\n# nil\np str1.index(\"i\", 5)\n# 6<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"23_String_rindex\"><\/span>2.3 String rindex<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.rindex \u7684 r \u4ee3\u8868 reverse\uff0c\u4e00\u6a23\u6703\u56de\u50b3\u7b26\u5408 argument \u5b57\u4e32\u7684\u4f4d\u7f6e\uff0c\u4f46\u662f\u662f\u5f9e String object \u7684\u6700\u5f8c\u4e00\u500b\u5b57\u5143\u958b\u59cb\u627e\u8d77\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.rindex(\"i\")\n# 6\np str1.rindex(\"ha\")\n# 9\np str1.rindex(\"H\")\n# nil\np str1.rindex(\"i\", 5)\n# 1<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"24_String_count\"><\/span>2.4 String count<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.count \u7528\u4f86\u8a08\u7b97\u5b57\u5143\u5728 String object \u4e2d\u51fa\u73fe\u7684\u6b21\u6578\uff0c\u6709\u8d85\u904e\u4e00\u500b\u5b57\u5143\u6642\uff0c\u6703\u5c07\u6b21\u6578\u76f8\u52a0\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.count(\"i\")\n# 2\np str1.count(\"is\")\n# 4<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"25_String_include\"><\/span>2.5 String include?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.include? \u7528\u4f86\u5224\u65b7 String object \u662f\u5426\u5305\u542b\u67d0\u5b57\u4e32<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"Jimmy\"\n\np str.include?(\"J\")\n# true\np str.include?(\"Ji\")\n# true\np str.include?(\"j\")\n# false<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"26_String_empty\"><\/span>2.6 String empty?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.empty? \u7528\u4f86\u5224\u65b7\u9019\u500b String object \u662f\u4e0d\u662f\u7a7a\u5b57\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"\"\nstr2 = \"Jimmy\"\n\np str1.empty?\n# true\np str2.empty?\n# false<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"3_String_Instance_Methods_II_%E2%80%93_%E6%93%8D%E4%BD%9C_%E4%B8%8D%E6%94%B9%E8%AE%8A%E5%8E%9F_Object\"><\/span>3. String Instance Methods II &#8211; \u64cd\u4f5c (\u4e0d\u6539\u8b8a\u539f Object)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u9019\u4e00\u90e8\u4efd\u6574\u7406\u5c0d String object \u64cd\u4f5c\u5f8c\u4e26\u4e14\u56de\u50b3 object \u7684 methods\uff0c\u9019\u4e9b methods \u4e26\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u7684 String object\u3002<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"31_String_upcase\"><\/span>3.1 String upcase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.upcase \u6703\u5c07 String object \u5168\u90e8\u8b8a\u6210\u5927\u5beb\u5f8c\u56de\u50b3\uff0c\u4f46\u4e0d\u6703\u6539\u8b8a\u539f\u4f86\u7684\u5b57\u4e32\u3002<\/p>\n\n\n\n<pre class=\"wp-block-verse\">\u5728 Ruby \u4e2d\uff0c\u5982\u679c\u5c0d\u539f\u4f86\u7684 object \u505a\u4e00\u4e9b\u64cd\u4f5c\uff0c\u901a\u5e38\u6703\u76f4\u63a5\u56de\u50b3\u65b0\u7684 object \u800c\u4e0d\u8b8a\u66f4\u5230\u539f\u672c\u7684 object\uff0c\u5982\u679c\u5e0c\u671b\u76f4\u63a5\u8b8a\u66f4\u539f\u672c\u7684 object\uff0c\u901a\u5e38\u9019\u500b method \u6703\u6709\u5c0d\u61c9\u7684 bang method ( \u901a\u5e38\u662f\u76f4\u63a5\u5728 method \u5f8c\u9762\u52a0\u4e0a! )\uff0cbang method \u6703\u76f4\u63a5\u8b8a\u66f4\u539f\u4f86\u7684 object\u3002<\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"Jimmy\"\n\np str.upcase\n# \"JIMMY\"\np str\n# \"Jimmy\"\n\nstr.upcase!\np str\n# \"JIMMY\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"32_String_downcase\"><\/span>3.2 String downcase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.downcase \u548c .upcase \u76f8\u53cd\uff0c\u6703\u5c07\u5b57\u4e32\u8f49\u6210\u5c0f\u5beb\u5f8c\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"JIMMY\"\np str.downcase\n# \"jimmy\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"33_String_capitalize\"><\/span>3.3 String capitalize<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.capitalize \u6703\u5c07 String \u8b8a\u6210\u7b2c\u4e00\u500b\u5b57\u5927\u5beb\uff0c\u5176\u4ed6\u5c0f\u5beb\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"jIMMY\"\nstr2 = \"jimmy\"\nstr3 = \"jimmy is 25 years old\"\n\np str1.capitalize\n# \"Jimmy\"\np str2.capitalize\n# \"Jimmy\"\np str3.capitalize\n# \"Jimmy is 25 years old\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"34_String_swapcase\"><\/span>3.4 String swapcase<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.swapcase \u6703\u5c07 String \u7684\u5927\u5c0f\u5beb\u5c0d\u8abf\u5f8c\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"JimMy\"\np str.swapcase\n# \"jIMmY\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"35_String_slice\"><\/span>3.5 String slice<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.slice \u53ef\u4ee5\u622a\u53d6 String object \u7684\u90e8\u5206\u5b57\u4e32\uff0c\u548c\u76f4\u63a5\u7528 [] \u622a\u53d6\u4e00\u6a23\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.slice(0, 5)\n# \"Jimmy\"\n# \u5f9e index = 0 \u622a\u53d6 5 \u500b\u5b57\u6bcd\np str1.slice(0..5)\n# \"Jimmy \"\n# \u5f9e index = 0 \u622a\u53d6\u5230 index = 5 (\u5305\u542b 5)\np str1.slice(0...5)\n# \"Jimmy\"\n# \u5f9e index = 0 \u622a\u53d6\u5230 index = 5 (\u4e0d\u5305\u542b 5)\n\n\np str1[0, 5]\n# \"Jimmy\"\n# \u5f9e index = 0 \u622a\u53d6 5 \u500b\u5b57\u6bcd\np str1[0..5]\n# \"Jimmy \"\n# \u5f9e index = 0 \u622a\u53d6\u5230 index = 5 (\u5305\u542b 5)\np str1[0...5]\n# \"Jimmy\"\n# \u5f9e index = 0 \u622a\u53d6\u5230 index = 5 (\u4e0d\u5305\u542b 5)\n<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"36_String_reverse\"><\/span>3.6 String reverse<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.reverse \u6703\u5c07\u5b57\u4e32\u9806\u5e8f\u5b8c\u5168\u985b\u5012\u5f8c\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"Jimmy\"\np str.reverse\n# \"ymmiJ\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"37_String_squeeze\"><\/span>3.7 String squeeze<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.squeeze \u6709\u5169\u7a2e\u57f7\u884c\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<ul><li>\u6c92\u6709\u4efb\u4f55 argument \u6642\uff0c\u6703\u522a\u9664\u6240\u6709\u91cd\u8907\u5b57\u5143<\/li><li>\u6709 argument \u6642\uff0c\u6703\u522a\u9664\u5b57\u4e32\u4e2d\u91cd\u8907\u7684 argument<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"JJimmmy iiss handsome\"\np str1.squeeze\n# \"Jimy is handsome\"\np str1.squeeze(\"J\")\n# \"Jimmmy iiss handsome\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"38_String_delete\"><\/span>3.8 String delete<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.delete \u6703\u522a\u9664\u7279\u5b9a\u5b57\u5143\u5f8c\u56de\u50b3\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.delete(\"i\")\n# \"Jmmy s handsome\"\np str1.delete(\"isa\")\n# \"Jmmy  hndome\"<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"4_String_Instance_Methods_III_%E2%80%93_%E6%93%8D%E4%BD%9C_%E6%9C%83%E6%94%B9%E8%AE%8A%E5%8E%9F_object\"><\/span>4. String Instance Methods III &#8211; \u64cd\u4f5c (\u6703\u6539\u8b8a\u539f object)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7b2c\u4e8c\u90e8\u5206\u4e3b\u8981\u6574\u7406\u4e00\u4e0b\u6703\u6539\u8b8a\u539f\u5b57\u4e32\u7684 methods\u3002<\/p>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"41\"><\/span>4.1 &lt;&lt;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>&lt;&lt; \u662f\u4e00\u500b operator\uff0c\u53ef\u4ee5\u5c07 &lt;&lt; \u5f8c\u9762\u7684\u5b57\u4e32\u76f4\u63a5\u52a0\u5230 &lt;&lt; \u524d\u9762\u7684\u5b57\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy\"\nstr2 = \" is handsome\"\n\nstr1 &lt;&lt; str2\np str1\n# \"\"Jimmy is handsome\"\"<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u6709\u8d85\u904e\u4e00\u500b &lt;&lt;\uff0c\u90a3\u53ea\u6703\u6539\u8b8a\u6700\u5de6\u908a\u7684\u5b57\u4e32\uff0c\u5176\u4ed6\u5b57\u4e32\u7dad\u6301\u4e0d\u8b8a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy\"\nstr2 = \" is\"\nstr3 = \" handsome\"\n\nstr1 &lt;&lt; str2 &lt;&lt; str3\np str1\n# \"Jimmy is handsome\"\np str2\n# \" is\"\np str3\n# \" handsome\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"42_String_concat\"><\/span>4.2 String concat<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.concat \u6703\u5c07 argument \u5167\u7684 String object \u52a0\u5230 call .concat \u7684 String object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy\"\nstr2 = \" is handsome\"\n\nstr1.concat(str2)\np str1\n# \"Jimmy is handsome\"\n\nstr1 = \"Jimmy\"\nstr2 = \" is\"\nstr3 = \" handsome\"\n\nstr1.concat(str2, str3)\np str1\n# \"Jimmy is handsome\"\np str2\n# \" is\"\np str3\n# \" handsome\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"43_String_prepend\"><\/span>4.3 String prepend<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.prepend \u548c .concat \u985e\u4f3c\uff0c\u53ea\u4e0d\u904e argument \u6703\u88ab\u52a0\u5230\u524d\u65b9\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy\"\nstr2 = \"is \"\nstr3 = \"handsome \"\n\nstr1.prepend(str2)\np str1\n# \"is Jimmy\"\n\nstr1 = \"Jimmy\"\nstr2 = \"is \"\nstr3 = \"handsome \"\n\nstr1.prepend(str2, str3)\np str1\n# \"is handsome Jimmy\"\np str2\n# \"is \"\np str3\n# \"handsome \"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"44_String_insert\"><\/span>4.4 String insert<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.insert \u53ef\u4ee5\u6307\u5b9a\u5728 String object \u7684\u67d0\u500b\u4f4d\u7f6e\u63d2\u5165\u5b57\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\nstr2 = \"tall and \"\n\nstr1.insert(9, str2)\np str1\n# \"Jimmy is tall and handsome\"<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"45_String_clear\"><\/span>4.5 String clear<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.clear \u6703\u5c07 String object \u8b8a\u6210\u7a7a\u5b57\u4e32\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\nstr1.clear\np str1\n# \"\"<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"5_String_Instance_Methods_IV_%E2%80%93_%E8%BD%89%E6%8F%9B%E6%88%90%E5%85%B6%E4%BB%96_Object\"><\/span>5. String Instance Methods IV &#8211; \u8f49\u63db\u6210\u5176\u4ed6 Object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"51_String_split\"><\/span>5.1 String split<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.spit \u53ef\u4ee5\u5c07 String object \u6309\u7167\u7279\u5b9a\u7684\u5b57\u5143\u5207\u5272\u6210 Array object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy is handsome\"\n\np str1.split\n# [\"Jimmy\", \"is\", \"handsome\"]\np str1.split(\" \")\n# [\"Jimmy\", \"is\", \"handsome\"]\np str1.split(\"is\")\n# [\"Jimmy \", \" handsome\"]<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"52_String_to_i\"><\/span>5.2 String to_i<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.to_i \u53ef\u4ee5\u5c07 String object \u8f49\u6210 Integer object \u4e26\u56de\u50b3\uff0c\u5982\u679c<\/p>\n\n\n\n<ul><li>String \u672c\u8eab\u4e0d\u662f\u6578\u5b57\uff0c\u5247\u56de\u50b3 0<\/li><li>String \u672c\u8eab\u6709\u5c0f\u6578\u9ede\uff0c\u7121\u689d\u4ef6\u6368\u53bb\u5f8c\u8f49\u6210 Integer object \u4e26\u56de\u50b3<\/li><\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"5\"\nstr2 = \"3.14\"\nstr3 = \"Jimmy\"\n\np str1.to_i\n# 5\np str2.to_i\n# 3\np str3.to_i\n# 0\np str1.to_i.class\n# Integer<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"53_String_to_f\"><\/span>5.3 String to_f<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.to_f \u5247\u662f\u5c07 String object \u8f49\u6210 Float object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"5\"\nstr2 = \"3.14\"\nstr3 = \"Jimmy\"\n\np str1.to_f\n# 5.0\np str2.to_f\n# 3.14\np str3.to_f\n# 0.0\np str1.to_f.class\n# Float<\/code><\/pre>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"54_String_to_sym\"><\/span>5.4 String to_sym<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.to_sym \u53ef\u4ee5\u5c07 String object \u8f49\u63db\u6210 Symbol object\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str = \"name\"\n\np str.to_sym\n# :name<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"6_String_Instance_Methods_V_%E2%80%93_Iterate_String_Object\"><\/span>6. String Instance Methods V &#8211; Iterate String Object<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3><span class=\"ez-toc-section\" id=\"61_String_each_char\"><\/span>6.1 String each_char<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>.each_char \u53ef\u4ee5\u904d\u6b77 String object \u7684\u6240\u6709\u5b57\u5143\uff0c\u4e26\u5c0d\u5176\u505a\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"ruby\" class=\"language-ruby line-numbers\">str1 = \"Jimmy\"\n\nstr1.each_char do |c|\n  p c + \"is\"\nend\n# \"Jis\"\n# \"iis\"\n# \"mis\"\n# \"mis\"\n# \"yis\"<\/code><\/pre>\n\n\n\n<h2><span class=\"ez-toc-section\" id=\"7_%E5%8F%83%E8%80%83%E8%B3%87%E6%96%99\"><\/span>7. \u53c3\u8003\u8cc7\u6599<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/www.udemy.com\/course\/learn-to-code-with-ruby-lang\/\" target=\"_blank\" rel=\"noreferrer noopener\">Learn to Code with Ruby<\/a><br><a href=\"https:\/\/ruby-doc.org\/core-3.1.2\/String.html\" target=\"_blank\" rel=\"noreferrer noopener\">Class: String (Ruby 3.1.2)<\/a><\/p>\n\n\n\n\n\n<p>\u5982\u679c\u89ba\u5f97\u6211\u7684\u6587\u7ae0\u6709\u5e6b\u52a9\u7684\u8a71\uff0c\u6b61\u8fce\u5e6b\u6211\u7684\u7c89\u5c08\u6309\u8b9a\u54e6~\u8b1d\u8b1d\u4f60\uff01<br><\/p>\n\n<iframe loading=\"lazy\" src=\"https:\/\/www.facebook.com\/plugins\/page.php?href=https%3A%2F%2Fwww.facebook.com%2Fjimmyswebnote&amp;tabs=timeline&amp;width=340&amp;height=500&amp;small_header=false&amp;adapt_container_width=true&amp;hide_cover=false&amp;show_facepile=true&amp;appId\" width=\"340\" height=\"500\" style=\"border:none;overflow:hidden\" scrolling=\"no\" frameborder=\"0\" allowfullscreen=\"true\" allow=\"autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share\"><\/iframe>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ruby String object \u662f\u6700\u5e38\u7528\u5230\u7684 object \u4e4b\u4e00\uff0c\u5e38\u7528 &#8220;&#8221; \u4f86\u5ba3\u544a\uff0c\u9019\u7bc7\u5c31\u4f86\u6574\u7406\u4e26\u4ecb\u7d39\u4e00\u4e0b Ruby String object \u7684\u7279\u6027\u548c\u5e38\u7528\u7684 methods \u5427\uff01<\/p>\n","protected":false},"author":1,"featured_media":2638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[184,90],"tags":[193],"_links":{"self":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2630"}],"collection":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/comments?post=2630"}],"version-history":[{"count":10,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2630\/revisions"}],"predecessor-version":[{"id":2666,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/posts\/2630\/revisions\/2666"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media\/2638"}],"wp:attachment":[{"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/media?parent=2630"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/categories?post=2630"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/jimmyswebnote.com\/wp-json\/wp\/v2\/tags?post=2630"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}