It's not pattern matching, but would replacing the apply with a reduce achieve the same result?
I'm not in a position to test this right now, but I believe (reduce f init ()) returns init without invoking f, and (conj x a b c) is equivalent to (reduce conj x [a b c]), so replacing apply with reduce should let you get rid of the if. On Tuesday, 9 February 2016, Stuart Sierra <the.stuart.sie...@gmail.com <javascript:_e(%7B%7D,'cvml','the.stuart.sie...@gmail.com');>> wrote: > Clojure's destructuring is not the same thing as the "pattern matching" > found in some other functional languages. Pattern matching can do various > conditional checks, destructuring cannot. Clojure's "defn" supports > destructuring in the argument list. > > Full pattern matching is available in Clojure via libraries such as > core.match: > https://github.com/clojure/core.match > > –S > > > > On Monday, February 8, 2016 at 2:41:44 PM UTC-5, Laws wrote: >> >> Sean Johnson has a great video about pattern matching, where he suggests >> that any function that starts with a conditional should have the >> conditional removed and the conditional logic implemented as >> pattern-matching and restructuring in the signature of the function. But >> after some experimentation, I have failed to figure out a way to do this >> here: >> >> (defn add-parties-to-customer-queue [parties] >> (if (seq parties) >> (swap! customer-queue >> (fn [previous-customer-queue] >> (apply conj previous-customer-queue parties))))) >> >> "parties" sometimes has a vector of vectors, but sometimes it is simply: >> () >> >> Is there any way I can match against that pattern in the function >> signature? >> >> >> >> >> >> -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > 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+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com 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+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
