On Oct 15, 2006, at 11:41 AM, Rich Morin wrote:

>   Higher Order Ruby
>   Mark-Jason Dominus, ???
>
>     This would take MJD's notions from Perl, where they
>     are hard to implement, to Ruby, where they aren't.

Not a book and I'm not finished with it yet, but:

http://blog.grayproductions.net/articles/category/higher-order-ruby

James Edward Gray II