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以前在講類的時候總喜歡舉貓抓老鼠的例子，今天寫了一個Ruby版，稍后獻上Ruby語法速查

?

class Cat
? def initialize(name, speed)
??? @name = name
??? @speed = speed
? end
???
? def catch(rat)
??? if @speed > rat.speed
????? puts @name + " CAN catch " + rat.name
??? else
????? puts @name + " CAN NOT catch " + rat.name
??? end
? end
end
???
class Rat

? attr_reader :speed
? attr_reader :name
? def initialize(name, speed)
??? @name = name
??? @speed = speed
? end
?end
?
tom = Cat.new('Tom', 60)
jerry = Rat.new('Jerry', 50)
?
tom.catch(jerry)