Clojure: Insert spaces into string every x chars

Question

I have a long clojure String, and I need to split it with spaces every 2 characters (ex: "1234567890" --> "12 34 56 78 90". The solution I used is:

(->>
  (partition 2 2 "" s)
  (map (partial join ""))
  (join " "))

Is there any simpler way to do this?

Answer 1

You can do it with regex, but is this simpler? For me - yes, but it looks like a matter of taste.

user> (clojure.string/replace "1234567890" #"(.{2})(?!$)" "$1 ")
"12 34 56 78 90"

Answer 2

Another possible variant:

user=> (->> "1234567890" (partition 2) (map #(apply str %))
            (clojure.string/join " "))
"12 34 56 78 90"