What's the right way to implement equality in ruby

Question

For a simple struct-like class:

class Tiger
  attr_accessor :name, :num_stripes
end

what is the correct way to implement equality correctly

Answer 1

To test all your instance variables equality at once:

def ==(other)
  other.class == self.class && other.state == self.state
end

def state
  self.instance_variables.map { |variable| self.instance_variable_get variable }
end