Name Begins WithVariable Scope

$	A global variable
@	An instance variable
[a-z]?or?_	A local variable
[A-Z]	A constant
@@	A class variable

以一個簡單例子示例各種變量的區別：

class Female# ConstantSEX = 'female'# Class variable: shared among all instances of this class@@sex = SEXdef initialize( weight, height)# Instance variable: accessible to specific instance of this class@weight = weight@height = heightenddef self.sex@@sexenddef description# Local variable: local to this blockideal_weight = @height * 0.8puts 'This female ideal weight would be ' + ideal_weight.to_s + ' and her actually weight is ' + @weight.to_sendendputs Female.new(130, 170).description puts Female.sex

Console中進入此文件所在文件夾，假設此文件名位test.rb，輸入 ruby test.rb 運行此文件，得到如下結果：

總結

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