Question

how to access the var in the “default” scope in other class definition , do something like this?

var = 1

class MyClass
def self.show
var
end

MyClass.show #=> 1

and BTW I notice the self in the “default” scope return main, what’s this?

Answer 1

It’s not possible. Variables defined like var = ... are always local variables.

Defining a global variable is done by $var = ....

Another more hacky approach would be defining an instance variable (@var = ...), but this would require you to somehow get the main instance into your MyClass.show which doesn’t seem to be worth the work.