Clojurians Log v2

Why is thread-last not able to resolve the % here?

(defn avg-noise-index [coll1 coll2]
  (->> (map noise-index-pairwise coll1 coll2)
       (reduce +)
       (/ % (count coll1))))

I assume you want this part (/ % (count coll1)) to be a lambda? If so you’d need to add #. So it would look like this #(/ % (count coll1))

You might be looking for as->

% only works in the context of an anonymous function ie #(/ % 5)

If you want to go the lambda route, don't forget to wrap it in an additional set of parens, otherwise it will return the function

I have a struct in my program that stores some variables about stock-count, stock-price, etc I am not sure how I should approach this in a functional way... any suggestions?

the values would somehow have to change I think, and I need to keep track of the initial values

@sunchaesk atoms are useful for holding on to data. you can change the value of an atom using swap! which takes a function to apply to the data, or reset! which sets the data anew. if you are storing your values in a map, you can use something like (swap! atom assoc key value) and if it is nested you can rely on assoc-in [:path :to :value] in general I think what you are looking for is swap!

Hmm okay thank you. I thought there was some way to manually place arguments in positions that aren’t the last position

you’d want as-> if you want to be able to control the position

also #() can prove surprising when used with arrow macros. it expands to (fn [%] (... %)) so the arrow would end up inserting your thing at the tail of that. while awkward you'd need to use (#(/ % (count coll1))) for that

(loop []
    (if-let [pom (try
                   (read-pom* url)
                   (catch java.net.ConnectException e
                     (if (= "Operation timed out" (ex-message e))
                       (log/error (str "Fetching pom from " url " failed because it timed out, retrying"))
                       (throw e))))]
      pom
      (recur)))

☝️ surely there is a more elegant way to write this?

Hi, I'm Pattern-chaser, a retired firmware designer of many years. I've programmed with many languages over the years, but mainly the old ones. In order of my usage (most used first): C, ASM, C++, then BASIC, Pascal, Fortran, and a bit of C#. All prehistoric. 😉

(or (try ...) (recur))

But if you want something more complete/robust, diehard works well https://github.com/sunng87/diehard

Well, of course 🙃 Thanks @clojurians-slack100 - I’m changing someone elses code, so minimal intervention.

Thanks! That's a good idea

what would be the bestway to handle maps(google maps/ mapbox) in clojure -> integrate it in js or handle it with clojure

Hard to provide unconditional advice without understanding a bit more about what you are trying to do.

Is your app server-side rendered (written in Clojure and generating HTML), or does it already have a ClojureScript front end?

Most of those are younger than LISP 😉

good explanation

@xx.slack fair point! 😄