Example of the new keyword argument / map function call syntax:

(defn destr [& {:keys [a b] :as opts}]
  [a b opts])

(destr :a 1)
->[1 nil {:a 1}]

(destr {:a 1 :b 2})
->[1 2 {:a 1 :b 2}]

I’m so glad the Clojure team is adding all of these new functions, like update-keys and update-vals. It’s easy to say (as they have in the past), “The implementation is simple, so just write it yourself.” But this leads to a proliferation of implementations that have subtly different semantics and performance characteristics, which makes it hard to move between codebases.

Here’s to adding the rest of weavejester’s medley library to clojure.core! 😉