This document goes into fairly deep dive on other ways to do it, including a gotcha on edge cases of using something like (comp - compare) that will rarely if ever bite you, but some people may want to know about them to avoid them.
https://clojure.org/guides/comparators Andy On Wed, Oct 14, 2020 at 7:58 AM Matthew O. Smith <m0sm...@gmail.com> wrote: > Google brought this up in 2020 > > Try > (comp - compare) > > > > On Tuesday, December 23, 2014 at 10:04:35 AM UTC-7 > julian...@googlemail.com wrote: > >> That's awesome! (though I'm slightly surprised there isn't an easier >> way). >> >> Thanks. >> >> >> On Tuesday, 23 November 2010 21:03:37 UTC, Tyler Perkins wrote: >>> >>> Nice! And with just a bit more, we have a clean, sorting DSL: >>> >>> (def asc compare) >>> (def desc #(compare %2 %1)) >>> ;; compare-by generates a Comparator: >>> (defn compare-by [& key-cmp-pairs] >>> (fn [x y] >>> (loop [[k cmp & more] key-cmp-pairs] >>> (let [result (cmp (k x) (k y))] >>> (if (and (zero? result) more) >>> (recur more) >>> result))))) >>> >>> (sort (compare-by :last-name asc, :date-of-birth desc) coll) >> >> -- > 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/769d3b44-e1dc-43f4-8728-7ecfdce86e79n%40googlegroups.com > <https://groups.google.com/d/msgid/clojure/769d3b44-e1dc-43f4-8728-7ecfdce86e79n%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- 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/CAKvLtDZEuD3%3DAzGW0HHC5-NGwbSba0hyUnLTn4vOPkWvWuGrgQ%40mail.gmail.com.
