第一个ruby程序

# 数据源定义，原应为关联数据库，这里只是进行模拟
class DS
  parts = ‘cpu‘, ‘mouse‘, ‘keyboard‘  # 临时数组用于批量生成方法
  parts.each do |part|
    define_method "get_#{part}_info".to_sym do |id| # 生成三种设备的信息函数
      "This is #{part} #{id}."
    end
    define_method "get_#{part}_price".to_sym do |id|  # 生成三种设备的价格函数
      parts.zip([150, 50, 40]).to_h[part] # 通过zip合并数组转换为哈希结构再索引
    end
  end
end
# 电脑配件定义
class Computer
  def initialize(computer_id, data_source)  # 初始化id和数据源
    @id = computer_id
    @data_source = data_source
  end
  parts = ‘cpu‘, ‘mouse‘, ‘keyboard‘
  parts.each do |part|
    define_method part.to_sym do
      info = @data_source.send("get_#{part}_info".to_sym, @id)
      price = @data_source.send("get_#{part}_price".to_sym, @id)
      result = "#{info} ($#{price})"
      return " * #{result}" if price >= 100 # 判断价格是否高于100，加星号显示
      result
    end
  end
end
puts "DS methods: #{DS.instance_methods(false)}"
puts "Computer methods: #{Computer.instance_methods(false)}"

ds = DS.new
computer = Computer.new(10, ds)
puts computer.cpu
puts computer.mouse
puts computer.keyboard