I am looking for a function that returns the first element in a sequence for which an fn evaluates to true. For example:
(first-map (fn [x] (= x 1)) '(3 4 1))
The above fake function should return 1 (the last element in the list). Is there something like this in Clojure?
user=> (defn find-first
[f coll]
(first (filter f coll)))
#'user/find-first
user=> (find-first #(= % 1) [3 4 1])
1
Edit: A concurrency. :) No. It does not apply f
to the whole list. Only to the elements up to the first matching one due to laziness of filter
.