1 files changed, 4 insertions, 0 deletions
diff --git a/ruby/types.rb b/ruby/types.rb
index 16d8d1e..6f22041 100644
--- a/ruby/types.rb
+++ b/ruby/types.rb
@@ -6,6 +6,10 @@ end
 class Vector < Array
 end
 
+def sequential?(obj)
+    return obj.is_a?(List) || obj.is_a?(Vector)
+end
+
 class Function < Proc
     attr_accessor :ast
     attr_accessor :env