Ruby On Rails Interview Questions and Answers
Ques. What are Class Variables? How to define them?Ans.
Class variables are created using the @@ prefix to denote the variable as class level.
It works just like any other variable, however in the case of inheritance it works more like a static variable that is accessed across all variable instances.
Another example can be found here:
class DemoClass @@my_var = nil def initialize @@my_var = "hello world" end def my_var puts @@my_var end end class Demo2Class < DemoClass def initialize @@my_var = "goodbye world" end end demo1 = DemoClass.new demo1.my_var demo2 = Demo2Class.new demo2.my_var demo1.my_var The output would be as shown below: hello world goodbye world goodbye world
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