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instance method
Set#subset?
subset?(set)
lib/set.rb
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# File tmp/rubies/ruby-3.0.5/lib/set.rb, line 278
def 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? { |o| set.include?(o) }
else
raise ArgumentError, "value must be a set"
end
end
Returns true if the set is a subset of the given set.