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

instance method

Set#member?

member?(o)

# File tmp/rubies/ruby-3.1.3/lib/set.rb, line 403
def include?(o)
  @hash[o]
end

Returns true if the set contains the given object.

Note that include? and member? do not test member equality using == as do other Enumerables.