Question

I can read some data in like this in the repl. For a real program I plan to assign in a let special form.

(def x1 (line-seq (BufferedReader. (StringReader. x1))))

If I enter 5 5, x1 is bound to (“5 5”)

I would like to convert this list of one element into a list of two integers. How can I do that? I have been playing around with parsing the string on whitespace, but am having trouble performing the conversion to integer.

Answer 1

Does this help? In Clojure 1.3.0:

(use ['clojure.string :only '(split)])
(defn str-to-ints
  [string]
  (map #(Integer/parseInt %)
        (split string #" ")))
(str-to-ints "5 4")
; => (5 4)
(apply str-to-ints '("5 4"))
; => (5 4)

In case the Clojure version you’re using doesn’t have clojure.string namespace you can skip the use command and define the function in a following way.

(defn str-to-ints
  [string]
  (map #(Integer/parseInt %)
        (.split #" " string)))

You can get rid of regular expressions by using (.split string " ") in the last line.