End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Set#flatten

flatten

# File tmp/rubies/ruby-3.1.3/lib/set.rb, line 387
def flatten
  self.class.new.flatten_merge(self)
end

Returns a new set that is a copy of the set, flattening each containing set recursively.

See also #flatten! #filter! #empty? #include? also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.0