get instance variable name from itself in ruby

Question

I have an instance variable @foo and I want to write some code so that I get string \'foo\'

any hint?

Answer 1

You can call the method instance_variables to get the name of all instance variables of an object. Caution though that instance variables are only included in that list after they have been initialized.

>> class A; attr_accessor :foo; end
=> nil
>> a = A.new
=> #
>> a.instance_variables
=> []
>> a.foo = 42
=> 42
>> a.instance_variables
=> ["@foo"]