Test whether a list contains a specific value in Clojure

Question

What is the best way to test whether a list contains a given value in Clojure?

In particular, the behaviour of contains? is currently confusing me:

Answer 1

The recommended way is to use some with a set - see documentation for clojure.core/some.

You could then use some within a real true/false predicate, e.g.

(defn in? [coll x] (if (some #{x} coll) true false))