lib/refinements/arrays.rb in refinements-9.5.0 vs lib/refinements/arrays.rb in refinements-9.6.0

@@ -6,9 +6,11 @@
   # Provides additional enhancements to the Array primitive.
   module Arrays
     refine Array do
       import_methods Shared::Enumerables::Many
 
+      def combinatorial?(other) = !other.empty? && size == union(other).size
+
       def compress = dup.compress!
 
       def compress!
         compact!
         delete_if { |element| element.respond_to?(:empty?) && element.empty? }