@Yarin显然我在这里错了一半;似乎print(true and false)是一个语法错误,我没有意识到。 很好的答案 - 谢谢! 和/或用于控制流程。 Ruby不允许将此作为??有效语法: 1 false||raise"Error" 但这是有效的: 1 falseorraise"Error" 您可以使用()进行第一项工作,但使用or是正确的方法。 1 false||(raise"Error...
(7)操作符Operators a = 100 # 赋值运算 a = (1 + 2) / (3 - 4) * 5 # 四则运算 a = (1 && 2) and (3 || 4) or !(5) # 逻辑运算 a = 7 % 2 # 取余数 a = (1 == 2) or (3 != 4) or (5 < 6) or (7 <= 8) # 比较运算 a > 5 ? puts(a) : "oh no" ...
Ruby Operators 在Ruby 中编写单行 if 语句 Ruby JSON 在Ruby 中解析 JSON 字符串 Ruby CLI 在Ruby 中使用 Get 接受用户输入 Ruby Input 在Ruby 中使用 Get 接受用户输入 Ruby Safe Navigation 在Ruby 中使用安全导航 Ruby Pattern Matching 在Ruby 中使用模式匹配运算符 ...
bar # => nil (undefined) 3.4.10 Ruby Dot "." and Double Colon "::" Operators 调用模块方法用点(.)操作符,引用常量使用双冒号(::) 如果没有前缀,默认是主模块。 MR_COUNT = 0 # constant defined on main Object class module Foo MR_COUNT = 0 ::MR_COUNT = 1 # set global count to 1 ...
%x(echo command interpretation with interpolation and backslashes) 反斜线符号: 以下是由Ruby支持反斜线符号列表: Ruby数组: 创建对象引用方括号内放置一个逗号分隔的一系列Ruby数组的文字。一个被忽略尾随逗号. 例子: #!/usr/bin/ruby ary = [ "Ali", 10, 3.14, "This is a string", "last element", ...
(Ruby operators) Operators are the symbols which assist compiler or interpreter to carry out certain mathematical, logical and relational tasks and produce the results. Operators are method calls with parameters. 运算符是帮助编译器或解释器执行某些数学,逻辑和关系任务并产生结果的符号。 运算符是带有参数...
5. Bitwise Operators Bitwise operators work on bits. Below are the bitwise operators used in ruby. 1.&: This AND operator will perform AND operation on bits. 2.|: This OR operator will perform OR operation. <<: This operator will shift the bits left side. ...
1.1.6 Punctuation Suffixes and Prefixes We saw previously that methods whose names end with = can be invoked by assignment expressions. Ruby methods can also end with a question mark or an exclamation point. A question mark is used to mark predicates—methods that return a Boolean value. For...
ENRuby on Rails是一个服务器端Web应用程序框架。它维护了一组策划组件和“约定优于配置”的理念，使得...
We can see that the logical && and || operators have higher precedence than the AND and OR operators. In most cases, the difference in precedence is negligible. However, there are a couple of situations where it is important, particularly when doing variable assignment:...