在向量的Clojure地图中排序向量

Question

I have a map of vectors, like this:

{2 ["a" "c" "b"], 1 ["z" "y" "x"]}

I want to get a map that is sorted by keys, and then each corresponding vector is also sorted, like this:

{1 ["x" "y" "z"], 2 ["a" "b" "c"]}

I know I can sort by keys by doing (into (sorted-map) themap) , and I know that I can supply a transducer to into , but I'm coming up short as to exactly how the transducer should look. Here's a transducer I've tried:

(defn xform [entry]
  (vector (first entry) (vec (sort (second entry)))))

However, when I try to apply it to my map, I get this exception:

java.lang.IllegalArgumentException: Don't know how to create ISeq from: clojure.core$conj__4345

How can I get this to work? Is there a better way then using into with a transducer?

Answer 1

Like this:

(into (sorted-map)
      (map (fn [[k v]] [k (vec (sort v))]))
      {2 ["a" "c" "b"], 1 ["z" "y" "x"]})