update-in, get-in, and assoc-in

update-in.md

Not using these functions is doing it wrong.

I recently went back and looked at some clojure I wrote when I was learning.

Given:

(def x {:a 1 :b {:c 3}})

So for a case like this, where I wanted to increment {:c 3} and have the change persist in x I was doing code like this:

(let [val (:c (x :b))
      updated (inc val)]
      (set! x (assoc x :b (assoc (:b x) :c updated))))