subset?(set)
public
Returns true if the set is a subset of the given set.
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def subset?(set)
case
when set.instance_of?(self.class)
@hash <= set.instance_variable_get(:@hash)
when set.is_a?(Set)
size <= set.size && all? { |o| set.include?(o) }
else
raise ArgumentError, "value must be a set"
end
end