Adding an instance variable to a class in Ruby

Question

How can I add an instance variable to a defined class at runtime, and later get and set its value from outside of the class?

I\'m looking for a metaprogramming so

Answer 1

Ruby provides methods for this, instance_variable_get and instance_variable_set. (docs)

You can create and assign a new instance variables like this:

>> foo = Object.new
=> #

>> foo.instance_variable_set(:@bar, "baz")
=> "baz"

>> foo.inspect
=> #