method

proper_subset?

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proper_subset?(set) public

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

# File lib/set.rb, line 184
  def proper_subset?(set)
    set.is_a?(Set) or raise ArgumentError, "value must be a set"
    return false if set.size <= size
    all? { |o| set.include?(o) }
  end

proper_subset?

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