Question

I want to repeatedly executes a function for its side-effects on a collection.
The common way is:

(defn my-func [x] (println x))
(doseq [x '(1 2 3) ]
       (my-func x))

But the x variable is a little bit cumbersome. I prefer the following code:

 ((comp doall map) my-func '(1 2 3))

Do you think this is an elegant solution?

Answer 1

clojure.core/dorun is better than doall, because doall holds the whole sequence in memory in order to return it to you. dorun returns nil, just as doseq does. To say that the language core “should” offer something like domap is a bit aggressive – for a language that discourages mutation and side effects, Clojure already has plenty of functions that are very close to what you want and are easy to combine.