Method: Set#proper_subset?

Defined in:
lib/set.rb

#proper_subset?(set) ⇒ Boolean Also known as: <

Returns true if the set is a proper subset of the given set.

Returns:

  • (Boolean) 


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# File 'lib/set.rb', line 441

def proper_subset?(set)
  case
  when set.instance_of?(self.class) && @hash.respond_to?(:<)
    @hash < set.instance_variable_get(:@hash)
  when set.is_a?(Set)
    size < set.size && all?(set)
  else
    raise ArgumentError, "value must be a set"
  end
end