erase

erase

class Whiteboard
  attr_accessor :contents

  def initialize(contents = [])
    @contents = contents
  end

  def erase
    @contents = []
  end

end

class DryEraseMarker
  attr_reader :color, :capacity
  def initialize(color)
    @color = color
    @capacity = 100
  end

  INK_USE_PER_CHARACTER = 0.01
  def write(contents, whiteboard)
   if ink_remaining?

    @capacity = @capacity - (INK_USE_PER_CHARACTER * contents.length)
   
    whiteboard.contents << contents
  else
    puts 'out of ink'
  end
  
  end
  def ink_remaining?
    if @capacity <= 0
      return false
    else
      return true
    end
  end

end