Set#<=>

(untyped other) -> 0?

<=>(set)

# File tmp/rubies/ruby-3.4.1/lib/set.rb, line 456
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.

See also #<= #== #<< #=== also in 4.1 · 4.0 · 3.3 · 3.2 · 3.1 · 3.0

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