Maybe in Ruby

maybe.rb

class Maybe
  attr_reader :run_maybe
  
  def initialize(result)
    @run_maybe = construct(result)
  end
  
  def construct(result)
    if result == ""
      Nothing.new
    else
      Just.new(result)
    end
  end
  
  class Nothing
  end
  
  class Just
    attr_reader :value
    
    def initialize(value)
      @value = value
    end
  end
end

a = Maybe.new("")

a.run_maybe # => #<Maybe::Nothing:0x007f883b899728>

b = Maybe.new("jolo")

b.run_maybe # => #<Maybe::Just:0x007f883b899278 @value="jolo">