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module Gorillib
  module Hashlike
    module ReverseMerge
      # Allows for reverse merging two hashes where the keys in the calling hash take precedence over those
      # in the <tt>other_hash</tt>. This is particularly useful for initializing an option hash with default values:
      #
      #   def setup(options = {})
      #     options.reverse_merge! :size => 25, :velocity => 10
      #   end
      #
      # Using <tt>merge</tt>, the above example would look as follows:
      #
      #   def setup(options = {})
      #     { :size => 25, :velocity => 10 }.merge(options)
      #   end
      #
      # The default <tt>:size</tt> and <tt>:velocity</tt> are only set if the +options+ hash passed in doesn't already
      # have the respective key.
      def reverse_merge(other_hash)
        other_hash.merge(self)
      end unless method_defined?(:reverse_merge)

      # Performs the opposite of <tt>merge</tt>, with the keys and values from the first hash taking precedence over the second.
      # Modifies the receiver in place.
      def reverse_merge!(other_hash)
        merge!( other_hash ){|k,o,n| o }
      end unless method_defined?(:reverse_merge!)
    end
  end
end

Version data entries

18 entries across 18 versions & 1 rubygems

Version Path
gorillib-0.6.0 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.5.2 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.5.0 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.4.2 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.4.2pre lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.4.0pre lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.4.1pre lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.11 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.9 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.8 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.7 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.6 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.5 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.4 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.3 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.2 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.1 lib/gorillib/hashlike/reverse_merge.rb
gorillib-0.1.0 lib/gorillib/hashlike/reverse_merge.rb