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Array(数组):顺序且有序的集合类型，Ruby中使用方括号来获取数组元素，索引使用数字，从0开始 Hash(哈希or散列):使用键值操作的集合类型，哈希中的索引不局限于使用数字，Hash中的索引也被称为键，使用花括号包含键值对的形式表示 Symbol(符号):Ruby中特有的数据类型，rails中经常用到，使用symbol会比使用字符串更有效率，比如“是否相等”这类问题，字符串是按字母一个一个

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3小时Mysql入门sql语句中<>与!=作用一样REGEXP–正则 REGEXP ‘[gim]e’—-搜索ge ie me REGEXP ‘[a-h]e’ where中，^—-beginning $—-end |—-logical or excise select *from customerswhere first_name REGEXP 'elka|a

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学习自【尚硅谷】Redis 6 入门到精通 超详细 教程 参考文档： http://redisdoc.com/ https://devdocs.io/ https://www.redis.net.cn/tutorial/3501.html NoSQL数据库简介概述NoSQL(NoSQL = Not Only SQL )，意即“不仅仅是SQL”，泛指非关系型的数据库。 NoSQL 不依赖业务逻辑方

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Proc类Proc类是个啥用来使块对象化的类！ 创建Proc对象Proc.new()irb(main):001:1* hello1 = Proc.new do |name|irb(main):002:1* puts "Hello, #{name}."irb(main):003:0> endirb(main):004:0> hello1.cal

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Proc类Proc类是个啥用来使块对象化的类！ 创建Proc对象Proc.new()irb(main):001:1* hello1 = Proc.new do |name|irb(main):002:1* puts "Hello, #{name}."irb(main):003:0> endirb(main):004:0> hello1.cal

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什么是条件判断某个条件时，执行oo处理，否则执行xx处理 if语句 unless语句 case语句 Ruby中的条件在Ruby中有个约定俗成的规则，为了使程序更容易理解，返回真假值的方法都要以？结尾 逻辑运算符一般用&&，||，！—->优先级高一些 if语句irb(main):001:0> a = 10irb(main):002:0> b = 20irb(ma

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