I've seen magic variables like this used in Ruby. $_ $' $0
我在Ruby中看过像这样的魔术变量。 $ _ $'$ 0
Is there a complete reference for what all of them mean and how they are set?
是否有完整的参考资料来说明它们的含义以及它们是如何设定的？
3 个解决方案
#1
34
Their name is global variables. There are several different references.
他们的名字是全局变量。有几个不同的参考。
You can get a full list by calling the method Kernel#global_variables
您可以通过调用Kernel＃global_variables方法获取完整列表
puts global_variables
Ruby also includes a file called "English.rb" in the standard library which provides an in-depth explanation of several global variables.
Ruby还在标准库中包含一个名为“English.rb”的文件，该文件提供了对几个全局变量的深入解释。
Also, there's (an archived version of) "Cryptic Ruby Global Variables and Their Meanings".
此外，还有（Cryived Ruby Global Variables及其含义）的存档版本。
Finally, the Ruby Programming wikibook has a "Predefined Variables" reference.
最后，Ruby Programming wikibook有一个“预定义变量”参考。
#2
4
They are called "global variables" (complete list at the bottom of the page): http://www.rubyist.net/~slagell/ruby/globalvars.html
它们被称为“全局变量”（页面底部的完整列表）：http：//www.rubyist.net/~slagell/ruby/globalvars.html
#3
2
The Ruby documentation used to be very class orientated. In recent versions of Ruby however there are rdoc files about literals, precedence, syntax, globals and much more.
Ruby文档过去非常以类为导向。在最近的Ruby版本中，有关于文字，优先级，语法，全局等的rdoc文件。
#1
34
Their name is global variables. There are several different references.
他们的名字是全局变量。有几个不同的参考。
You can get a full list by calling the method Kernel#global_variables
您可以通过调用Kernel＃global_variables方法获取完整列表
puts global_variables
Ruby also includes a file called "English.rb" in the standard library which provides an in-depth explanation of several global variables.
Ruby还在标准库中包含一个名为“English.rb”的文件，该文件提供了对几个全局变量的深入解释。
Also, there's (an archived version of) "Cryptic Ruby Global Variables and Their Meanings".
此外，还有（Cryived Ruby Global Variables及其含义）的存档版本。
Finally, the Ruby Programming wikibook has a "Predefined Variables" reference.
最后，Ruby Programming wikibook有一个“预定义变量”参考。
#2
4
They are called "global variables" (complete list at the bottom of the page): http://www.rubyist.net/~slagell/ruby/globalvars.html
它们被称为“全局变量”（页面底部的完整列表）：http：//www.rubyist.net/~slagell/ruby/globalvars.html
#3
2
The Ruby documentation used to be very class orientated. In recent versions of Ruby however there are rdoc files about literals, precedence, syntax, globals and much more.
Ruby文档过去非常以类为导向。在最近的Ruby版本中，有关于文字，优先级，语法，全局等的rdoc文件。