crazy.rb

def create_multipler(factor)
  ->param{param * factor}
end

times_2 = create_multipler(2)
p times_2.(4)
exit
class Foo
  1_000_000_000.times do |n|
    define_method("times_#{n}") do |param|
      param * factor
    end
  end
end

Foo.new.times_873874

class MyClass
  def self.create_multipler(factor)
    define_method("times_#{factor}") do |param|
      param * factor
    end
  end
end

MyClass.create_multipler(2)  
m = MyClass.new  
puts m.times_2(3)   #=> 6  
puts m.times_2(4)   #=> 8  
  
MyClass.create_multipler(3)  
puts m.times_3("Ho! ")  #=> Ho! Ho! Ho!