That clears things up completely. Thanks for the help, everybody! On Monday, April 22, 2013 10:48:11 PM UTC-4, tbc++ wrote: > > To simplify the problem: > > ((binding [*funkybind* true] > (fn [] *funkybind*))) > > This is the same problem as your lazy-seq example. The issue is that > *funky-bind* is not deref'ed when the anonymous fn is created, but when it > is executed. In this example, by the time the fn is executed, *funkybind* > has reverted back to its old state. > > Timothy > > > On Mon, Apr 22, 2013 at 8:08 PM, Carlo Zancanaro > <carloza...@gmail.com<javascript:> > > wrote: > >> If you want to capture the binding and have laziness together you can >> also use `bound-fn`. >> >> (binding [*funkybind* true] (map (fn [_] *funkybind*) [0 1])) >> ;=> (false false) >> (binding [*funkybind* true] (map (bound-fn [_] *funkybind*) [0 1])) >> ;=> (true true) >> >> >> On Tue, Apr 23, 2013 at 11:52 AM, Travis Vachon >> <travis...@gmail.com<javascript:> >> > wrote: >> >>> Hi Daniel >>> >>> map is creating a lazy seq, which isn't evaluated until the REPL's >>> forces it to be printed, which is outside the scope of the binding. >>> >>> This: >>> >>> (binding [*funkybind* true] >>> (doall (map (fn [_] *funkybind*) [1 2]))) >>> >>> forces evaluation inside the binding, and does what you want. >>> >>> This is something I've been bitten by a few times, but the power that >>> lazyness brings ends up being worth it, IMHO. >>> >>> Good luck! >>> >>> Travis >>> >>> On Mon, Apr 22, 2013 at 9:41 PM, Daniel Higginbotham >>> <nonrec...@gmail.com <javascript:>> wrote: >>> > I've encountered a situation where the binding function doesn't work >>> as I >>> > expect it: >>> > >>> > user> (def ^:dynamic *funkybind* false) >>> > >>> > ;; expected >>> > user> (binding [*funkybind* true] >>> > *funkybind*) >>> > true >>> > >>> > ;;expected >>> > (binding [*funkybind* true] >>> > ((fn [] *funkybind*))) >>> > true >>> > >>> > ;;... huh? >>> > (binding [*funkybind* true] >>> > (map (fn [_] *funkybind*) [1 2])) >>> > (false false) >>> > >>> > In the last example, why is the value of *funkybind* false instead of >>> true? >>> > >>> > Thanks! >>> > Daniel >>> > >>> > -- >>> > -- >>> > You received this message because you are subscribed to the Google >>> > Groups "Clojure" group. >>> > To post to this group, send email to clo...@googlegroups.com<javascript:> >>> > Note that posts from new members are moderated - please be patient >>> with your >>> > first post. >>> > To unsubscribe from this group, send email to >>> > clojure+u...@googlegroups.com <javascript:> >>> > For more options, visit this group at >>> > http://groups.google.com/group/clojure?hl=en >>> > --- >>> > You received this message because you are subscribed to the Google >>> Groups >>> > "Clojure" group. >>> > To unsubscribe from this group and stop receiving emails from it, send >>> an >>> > email to clojure+u...@googlegroups.com <javascript:>. >>> > For more options, visit https://groups.google.com/groups/opt_out. >>> > >>> > >>> >>> -- >>> -- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To post to this group, send email to clo...@googlegroups.com<javascript:> >>> Note that posts from new members are moderated - please be patient with >>> your first post. >>> To unsubscribe from this group, send email to >>> clojure+u...@googlegroups.com <javascript:> >>> For more options, visit this group at >>> http://groups.google.com/group/clojure?hl=en >>> --- >>> You received this message because you are subscribed to the Google >>> Groups "Clojure" group. >>> To unsubscribe from this group and stop receiving emails from it, send >>> an email to clojure+u...@googlegroups.com <javascript:>. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >>> >> -- >> -- >> You received this message because you are subscribed to the Google >> Groups "Clojure" group. >> To post to this group, send email to clo...@googlegroups.com<javascript:> >> Note that posts from new members are moderated - please be patient with >> your first post. >> To unsubscribe from this group, send email to >> clojure+u...@googlegroups.com <javascript:> >> For more options, visit this group at >> http://groups.google.com/group/clojure?hl=en >> --- >> You received this message because you are subscribed to the Google Groups >> "Clojure" group. >> To unsubscribe from this group and stop receiving emails from it, send an >> email to clojure+u...@googlegroups.com <javascript:>. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> > > > > -- > “One of the main causes of the fall of the Roman Empire was that–lacking > zero–they had no way to indicate successful termination of their C > programs.” > (Robert Firth) >
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