So the steps are pretty clear from the comments: Write a function that expects one parameter (use defn, fn, or #()) That parameter should be a function, so check for that (fn?) Call that function Return the first element in the returned sequence (first) 3 solved Clojure creating higher order first function
You can use mapcat and an inner map like this: user=> (mapcat (fn [as b] (mapv #(vector % b) as)) [[1 2] [3 4]] [5 6]) ([1 5] [2 5] [3 6] [4 6]) solved Clojure – Combining Two vectors into a vector of vectors [duplicate]
From http://clojuredocs.org/clojure_core/clojure.core/apply ;you can also put operands before the list of operands and they’ll be consumed in the list of operands (apply + 1 2 ‘(3 4)) ; equal to (apply + ‘(1 2 3 4)) => 10 So (defn bar [x & ys] (apply foo (clojure.string/upper-case x) ys)) should work. For your problem with … Read more