./lib/animoto/support/hash.rb in animoto-1.1.1 vs ./lib/animoto/support/hash.rb in animoto-1.2.0

@@ -5,18 +5,18 @@
       # Returns a new hash with only the listed keys from this hash.
       #
       # @param [Array<Object>] keys the keys to include
       # @return [Hash{Object=>Object}] a new hash with only the listed keys
       def only *keys
-        self.dup.delete_if { |k,v| !keys.include?(k) }
+        inject({}) { |h,(k,v)| h.merge(keys.include?(k) ? {k => v} : {}) }
       end unless {}.respond_to?(:only)
       
       # Returns a new hash with all keys from this hash except the listed ones.
       #
       # @param [Array<Object>] keys the keys to exclude
       # @return [Hash{Object=>Object}] a new hash without the listed keys
       def except *keys
-        self.dup.delete_if { |k,v| keys.include?(v) }
+        inject({}) { |h,(k,v)| h.merge(!keys.include?(v) ? {k => v} : {}) }
       end unless {}.respond_to?(:except)
       
     end
   end
 end
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