Alex, I plan to explore this idea. Many thanks!
Jack On Fri, Aug 14, 2020 at 1:38 PM Oleksandr Shulgin < oleksandr.shul...@zalando.de> wrote: > <snip.> > > > Nevermind transducers: I've just realized that reduced can be used with > the normal reduce. E.g. here's short-circuiting AND-reduction fn: > > (defn andr > ([] true) > ([i] i) > ([r i] (let [o (and r i)] > (if o > o > (reduced o))))) > > When it comes to the actual lists, it depends how you'd like to represent > them. E.g. I could imagine something like the following can be a useful > notation: > > [:and 1 2 [:or 3 4] 5] > > or even more direct: > > (quote (and 1 2 (or 3 4) 5)) > > If you really want an interface-like look and feel, then protocols might > be the right answer: > > (defprotocol Evaluable > (evaluate [this])) > > (defrecord AndList [items] > Evaluable > (evaluate [this] > (reduce andr (:items this)))) > > user> (evaluate (->AndList [1 2 3])) > 3 > user> (evaluate (->AndList [1 false 3])) > false > > To complete it, you'll need to add the OrList and sneak (map evaluate) in > the reduce call in both And- and OrList. > > Cheers, > -- > Alex > <snip> > -- 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. To view this discussion on the web visit https://groups.google.com/d/msgid/clojure/CAH6s0fwVA5zhAJVdUaEMZN%2BhzThM8XMU1VtEWcej3PogPmxoLg%40mail.gmail.com.
