问Ruby:将标签映射到布尔条件中以获得true/false结果

EN

buy_it = "(new || expensive) && !lame"
buy_it_expr = buy_it.gsub(/(\w+)/, 'tags.include?("\1")')

puts buy_it_expr
=> (tags.include?("new") || tags.include?("expensive")) && !tags.include?("lame")

buy_it_proc = eval "Proc.new { |tags| #{buy_it_expr} }"

buy_it_proc.call(item1)
=> true
buy_it_proc.call(item2)
=> false

items = {'ipad' => ['new', 'expensive'], 'kindle' => ['expensive', 'lame']}
items.each do |name,tags|
  if tags.include?('new' || 'expensive') && !tags.include?('lame')
    puts "buy #{name}."
  else
    puts "#{name} isn't worth it."
  end
end