How can I properly chain custom methods in Ruby?

Question

I am trying to do a chaining method for the following two methods. After running this code, I kept getting the following output:

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Answer 1

This fellow (tjackiw.tumblr.com) uses this as an interview question and gives a very clean walkthough of how & why the correct answer is similar to the following:

class Interpreter

  def initialize(&block)
    instance_eval(&block)
  end

  def at(time)
    @time = time
    self
  end

  def when(date)
    @date = date
    self
  end

  def we(*people)
    @people = people
    self
  end

  def going(where)
    @where = where
    self
  end

  def output
    [@people.join(' and '), "are going", @where, @date, "at", @time].join(' ')
  end

end