For those who don't know that's the thread macro and IMHO it should be a bigger selling point of the language. I think of it like the Unix pipe operator (i.e. "ls | grep X") but for programming.

https://clojuredocs.org/clojure.core/->

edit: I usually pretty-print it, too:

  (-> g              ;; input value
      (partial a)    ;; runs as (partial g a), hands off A
      (comp f)       ;; runs as (comp A f), hands off B
      (map x))       ;; runs as (map B x), this returns a value

or

  (-> 5
      (< 10))        ;; runs as (< 5 10)
  => true

with a little tom-foolery (lambda functions) you can have the incoming value land anywhere in the function's argument list