How to check how many arguments the method accepts

arguments_count.rb

# How to check how many arguments the method accepts?

class Foo 

  def initialize
    
  end 

  def bar(a,b)
    
  end 

  def foo(&block)
    
  end 

  def baz(*args)
    
  end 

end

%w[initialize bar foo baz].each do |method|
  puts "#{method} has #{Foo.instance_method(method).arity} arguments"
end