lib/regexp-examples/helpers.rb in regexp-examples-0.0.0 vs lib/regexp-examples/helpers.rb in regexp-examples-0.0.1

@@ -5,13 +5,15 @@
   # element from each array
   #
   # For example:
   # permutations_of_strings [ ['a'], ['b'], ['c', 'd', 'e'] ] #=> ['acb', 'abd', 'abe']
   # permutations_of_strings [ ['a', 'b'], ['c', 'd'] ] #=> [ 'ac', 'ad', 'bc', 'bd' ]
-  def self.permutations_of_strings(arrays_of_strings)
-    return arrays_of_strings[0] if arrays_of_strings.size == 1
+  def self.permutations_of_strings(arrays_of_strings, options={})
     first = arrays_of_strings.shift
-    first.product( permutations_of_strings(arrays_of_strings) ).map {|x| x.flatten.join}
+    return first if arrays_of_strings.empty?
+    first.product( permutations_of_strings(arrays_of_strings, options) ).map do |result|
+      options[:no_join] ? result.flatten : result.flatten.join
+    end
   end
 
   # TODO: For debugging only!! Delete this before v1.0
   def self.show(regexp)
     s = regexp.examples