lib/class_extensions.rb in rspreadsheet-0.2.3 vs lib/class_extensions.rb in rspreadsheet-0.2.4

@@ -1,5 +1,7 @@
+# @private
+
 class LibXML::XML::Node
   def elements
     result = []
     each_element { |e| result << e }
     return result
@@ -31,7 +33,17 @@
        
     return nil
   end
   def equals?(node2)  #TODO redefine == with this
     self.simplification_of?(node2) and node2.simplification_of?(self)
+  end
+end
+
+class Array
+  def sum(identity = 0, &block)
+    if block_given?
+      map(&block).sum(identity)
+    else
+      inject { |sum, element| sum + element } || identity
+    end
   end
 end
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