Code cleanup

core/ruby/hash.rb

@@ -8,13 +8,14 @@ class Hash
   # Recursively deep merge two hashes together
   # @param [Hash] hash Hash to be merged
   # @return [Hash] Combined hash
-  # @note Duplicate keys are overwritten by the value defined in the hash calling deep_merge (not the parameter hash)
+  # @note Duplicate keys are overwritten by the value defined
+  #       in the hash calling deep_merge (not the parameter hash)
   # @note http://snippets.dzone.com/posts/show/4706
   def deep_merge(hash)
     target = dup
     hash.keys.each do |key|
-      if hash[key].is_a? Hash and self[key].is_a? Hash
-        target[key] = target[key].deep_merge(hash[key])
+      if hash[key].is_a?(Hash) && self[key].is_a?(Hash)
+        target[key] = target[key].deep_merge hash[key]
         next
       end
       target[key] = hash[key]

core/ruby/object.rb

@@ -35,4 +35,9 @@ class Object
     self.is_a?(Class)
   end
 
+  # Returns true if the object is nil, and empty string, or empty array
+  # @return [Boolean]
+  def blank?
+    self.respond_to?(:empty?) ? !!empty? : !self
+  end
 end