Callable objects

Define a class with a call method

class Command
  def initialize(message)
    @message = message
  end

  def call(attempt)
    puts "I'm a command attempt \##{attempt}: #{@message}"
  end
end

Call the object

> do_this = Command.new("cool, huh?")
> do_this.(3)
I'm a command attempt #3: cool, huh?