[Solved] Instance variable outside of instance method

Question

#what does line 2 do?

class Person
@age = 0
def initialize(name, age)
@name = name
puts @age
end
end

ob = Person.new("Jafca", 42)

https://code.sololearn.com/cj3L4nsnZsy4/?ref=app

Answer 1

Finally found something:
Line 2 sets the default value of @age to 0.
Line 2 @age is a "class instance variable".
Line 4 @age is an "instance variable".
These two are separate variables, even though they have the same names!
The class instance variable is accessible in class methods e.g.
def self.c
...
end
The instance variable is accessible in instance methods e.g.
def initialize
...
end
def m
...
end

Source: http://stackoverflow.com/a/27649945

Answer 2

This is the ruby program