On Thu, Feb 17, 2011 at 12:29 AM, Andreas Kostler
<andreas.koestler.le...@gmail.com> wrote:
> Is there an easy and idiomatic way of getting the digits of a number in
> clojure?
>
> (defn explode-to-digits [number]
> (map #(- (int %) (int \0)) (str number)))
> (explode-to-digits 123456)
> => (1 2 3 4 5 6)
>
> Seems a bit clunky...
How about
(defn explode-to-digits [n]
(if (= n 0)
[]
(let [d (rem n 10)
r (quot n 10)]
(conj (explode-to-digits r) d))))
or if you want to avoid consuming stack
(defn explode-to-digits* [n out]
(if (= n 0)
out
(let [d (rem n 10)
r (quot n 10)]
(recur r (cons d out)))))
(defn explode-to-digits [n]
(explode-to-digits* n nil))
It should also be possible to make a lazy sequence version, but
returning the digits in the reverse order.
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