Move NilPerson to own file

1 files changed, 31 insertions, 0 deletions

diff --git a/lib/nil_person.rb b/lib/nil_person.rb
new file mode 100644
index 0000000..30a175f
--- /dev/null
+++ b/lib/nil_person.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+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