Le Wed, 27 Jun 2007 17:06:51 +0200, Quôc Peyrot a écrit : > It has been said multiple times on this > mailing list, but I think we really miss a book about these design > patterns and optimization tricks often specific to a given (or a set > of) feature (functional, lazy computations, garbage collector...). _Purely functional data structures_ by Chris Osaki might interest you. It's a very good book, covering lazy evaluation and persistent amortized data structures (among other things). Moreover, it does insist on optimizations (often left as exercises to the reader, with enough hints to be easy to figure out). Regards, -- Gabriel