Hi,
For the purposes of testing another function (not discussed here), I
wrote a function to generate random strings. This is what I ended up
with after some trial and error.
(defn generate-data [size maxlength]
; Returns a collection of 'size random strings, each at most
'maxlength chars.
(let [alphabet "abcdefghijklmnopqrstuvwxyz"
rand-letter (fn [_] (nth alphabet (rand-int 26)))
rand-stream (map rand-letter (iterate inc 0))
rand-string (fn [n] (apply str (take n rand-stream)))]
(map (fn [_] (rand-string (rand-int maxlength)))
(range size))))
; test
(generate-data 25 19)
The output of the testing function is something like ("gr", "gry",
"gr", "g", "gry"). That is, is always _takes_ from the same sequence
of random characters.
Is there a way I might modify the above code so rand-stream is indeed
a stream (with new random data each time) instead of a sequence (where
every _take_ starts from the beginning)?
Of course, I'd love to see other people's approach to implementing
'generate-data, but I'm also curious about the idea of streams
themselves.
Cheers,
Gavin [second post]
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