2017-09-06 10:13 GMT+02:00 dennis zhuang <killme2...@gmail.com>:
> 1.Maybe you can use :pre metadata:
>
> (defn create-pin
> ([] (create-pin 8))
> ([n]
> {:pre [(<= n 16)
> (>= n 4)]}
> (let [chars (map char (range (int \0) (inc (int \9))))]
> (reduce str (repeatedly n #(rand-nth chars))))))
>
> (create-pin 3)
> AssertionError Assert failed: (>= n 4) user/create-pin (NO_SOURCE_FILE:27)
>
>
> and clojure.spec is great too.
>
For the moment I will go for :pre, but I will also look into clojure.spec.
> 2. you can use concat
>
> (concat seq1 seq2)
>
I should have wait a little longer with asking. I already found it. But
thanks anyway.
--
Cecil Westerhof
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