Set logic for Ruby hashes. Somehow nothing like this is built in.

hash-set-logic.rb

require 'set'

class Hash
  # Returns true if the set of this Hash's key/value pairs
  # is a superset of the given hash's key/value pairs.
  #
  # See Set#superset?
  def superhash?(hash)
    self.to_set.superset?(hash.to_set)
  end

  # Returns true if the set of this Hash's key/value pairs
  # is a proper superset of the given hash's key/value pairs.
  #
  # See Set#proper_superset?
  def proper_superhash?(hash)
    self.to_set.proper_superset?(hash.to_set)
  end

  # Returns true if the set of this Hash's key/value pairs
  # is a subset of the given hash's key/value pairs.
  #
  # See Set#subset?
  def subhash?(hash)
    self.to_set.subset?(hash.to_set)
  end

  # Returns true if the set of this Hash's key/value pairs
  # is a proper subset of the given hash's key/value pairs.
  #
  # See Set#proper_subset?
  def proper_subhash?(hash)
    self.to_set.proper_subset?(hash.to_set)
  end
end