lib/modalsupport/enumerable.rb in modalsupport-0.2.0 vs lib/modalsupport/enumerable.rb in modalsupport-0.3.0

@@ -1,11 +1,11 @@
 module Enumerable
 
   def grep_each(pattern)
     grep(pattern){|str| yield(Regexp.last_match)}
   end
-  
+
   if RUBY_VERSION < "1.8.7"
     require 'enumerator'
     alias enumerator_each_slice each_slice
     def each_slice(n, &blk)
       if blk
@@ -14,18 +14,33 @@
       else
         enum_slice(n, &blk)
       end
     end
   end
-  
+
   def each_pair(&blk)
     each_slice(2, &blk)
   end
-  
+
   # Convert to pairs [[e1,e2], [e3,e4], ...]
   # Note that for a Hash, this is equivalent to hash.to_a.to_pairs which may not be what's intended; hash.to_a is
   # an array of key-value pairs; to_pairs is an array of pairs of key-value pairs.
   def to_pairs
     each_pair.to_a
   end
- 
+
+  # cartesian product
+  #  note that for Ruby >= 1.8.7 a.each_product_pair(b).to_a == a.to_a.product(b.to_a)
+  def each_product_pair(other)
+    if block_given?
+      self.each do |this|
+        other.each do |that|
+          yield [this, that]
+        end
+      end
+    else
+      enum_for(:each_product_pair, other)
+    end
+  end
+
+
 end