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# frozen_string_literal: true
class Person
attr_accessor :name, :gender, :spouse
def initialize(name, gender, spouse = NilPerson.new)
@name = name
@gender = gender
@spouse = spouse
end
def ==(other)
other.is_a?(Person) && name == other.name && gender == other.gender && spouse == other.spouse
end
def eql?(other)
self == other
end
def hash
[name, gender, spouse].hash
end
def to_s
"#{name} (#{gender})"
end
end
class NilPerson
def name
nil
end
def father
self
end
def mother
self
end
def gender
nil
end
def ==(other)
other.is_a?(NilPerson)
end
def eql?(other)
self == other
end
def to_s
''
end
end
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