Could you please recommend a book that's more up-to-date? On Wednesday, October 31, 2012 11:26:48 AM UTC+8, Sean Corfield wrote: > > Yes, it's very unfortunate that Manning released Clojure in Action > without a final pass to make it Clojure 1.3 compatible. I talked to > them about it when they still had time to make changes but they > decided to go ahead and publish a book that is tightly wedded to > Clojure 1.2 after Clojure 1.3 had been released. I think it was a > disservice to both the author and the community :( > > Sean > > On Tue, Oct 30, 2012 at 6:36 PM, Andy Fingerhut > <andy.fi...@gmail.com <javascript:>> wrote: > > The code works as written in Clojure 1.2 and 1.2.1. > > > > It doesn't in 1.3 and later, unless you change the definition of twice > to > > annotate that it is a dynamic var, like so: > > > > (defn ^:dynamic twice [x] > > (println "original function") > > (* 2 x)) > > > > With that change, it works in Clojure 1.3 and later. > > > > Andy >
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