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instance method
Set#<=>
<=>(set)
lib/set.rb
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# File tmp/rubies/ruby-3.0.5/lib/set.rb, line 306
def <=>(set)
return unless set.is_a?(Set)
case size <=> set.size
when -1 then -1 if proper_subset?(set)
when +1 then +1 if proper_superset?(set)
else 0 if self.==(set)
end
end
Returns 0 if the set are equal, -1 / +1 if the set is a proper subset / superset of the given set, or nil if they both have unique elements.