gistfile1.rb

class Washer
  attr_reader :name, :status
  @@num_washers = 0
  @@num_washers_washing = 0
  @@num_washers_rinsing = 0

  def initialize(args = nil)
    @@num_washers += 1
    @name = args[:name]
  end

  def self.report
    [@@num_washers, @@num_washers_washing, @@num_washers_rinsing]
  end

  def wash!
    @@num_washers_washing += 1
    @status = :washing
  end

  def endwash!
    @@num_washers_washing -= 1
    @status = :inactive
  end

  def rinse!
    @@num_washers_rinsing += 1
    @status = :rinsing
  end

  def endrinse!
    @@num_washers_rinsing -= 1
    @status = :inactive
  end

  def to_s
    "#{name}"
  end
end


w1 = Washer.new(:name => "washer 1")
w2 = Washer.new(:name => "washer 2")
w3 = Washer.new(:name => "washer 3")
w4 = Washer.new(:name => "washer 4")

washers = [w1, w2, w3, w4]

p washers.map{|w| w.wash!}
p washers
p Washer.report

p washers.sample(2).map{|w| w.endwash!}
p washers.map{|w| w.status}
p Washer.report

p washers.select{|w| w.status == :inactive}.map{|w| w.rinse!}
p washers.map{|w| w.status}
p Washer.report