roelof.rb

class Timer
  def initialize(seconds = 0)
    @seconds = seconds
    @minutes = 0
    @hours = 0

    calculate
  end

  attr_reader :seconds, :minutes, :hours

  def time_string
    padding(@hours.to_s) + ":" + padding(@minutes.to_s)+ ":" + padding(@seconds.to_s)
  end

  def padding(string)
    return "0" + string if string.length < 2

    string
  end

  private

  def calculate
    while @seconds > 60
      @minutes = @minutes + 1
      @seconds = @seconds - 60
    end

    while @minutes > 60
      @hours = @hours + 1
      @minutes = @minutes - 60
    end
  end
end