Clojurians Log v2

Nothing that's built into Clojure. You gotta do some manual processing of opts to merge the default values in. Something like

(defn configure [val & {:as opts}]
  (let [opts (merge-with (fn [v _] v) opts {:debug false :verbose false})]
    ...))

usually I just merge into a defaults map, then destructure

(defn configure [val & opts]
  (let [{:keys [debug verbose]} (merge {:debug false, :verbose false} opts)]
    (println "val =" val " debug =" debug " verbose =" verbose " opts =" opts)))

(configure 1)
val = 1  debug = false  verbose = false  opts = nil

can explicitly bind the "opts with defaults" too if you want to break it apart

and I don't think it's possible to change what :or does now without breaking lots of code. but perhaps something could be added that did this like :defaults, that just did the merge above for you

:and instead of :or :)

I logged a jira https://clojure.atlassian.net/browse/CLJ-2957 for enhancement to keep track of this, feel free to vote on the ask above

Oh, what a brain fart on my end with merge-with, lol.

Maybe one of the biggest advantage of an "extended" support of this inside the function signature itself, would be to "auto-document" such a 'default', as most IDEs show "full function signatures":

yes

may have interesting entanglements with the upcoming required keys enhancements

Required keys enhancements?

@jason.bullers last clojure dev call dropped some info (caveat, everything is still being designed) about adding something like :keys! destructuring that requires the keys specified (e.g. throws IllegalArgumentException if they are not present). See https://clojurians.slack.com/archives/C06E3HYPR/p1779828764865859

Cool, I'll check that out. Hadn't heard about it before. Thanks!