这本Programming Ruby虽然不是一本称职的参考手册，却足够帮助一个初学者步入Ruby世界而不致误入歧途，并且能够在很少见的一些情况下——譬如说忘了yield的用法——给有经验的Ruby程序员提供帮助。-Programming Ruby not a competent Reference Manual, but enough to help a beginner into the the Ruby world without going astray, and can in some cases rare- say, forget yield usage- experienced Ruby programmer help.