(defn iterate [s]
(let [a (atom s)]
(fn []
(let [s @a]
(reset! a (next s))
(first s))))))
but it's not very idiomatic in clojure.
(In Lisp it is traditional to hide a state in a closure. A lot of toy
object language work like that)
On Thu, Oct 14, 2010 at 9:38 PM, Moritz Ulrich
<ulrich.mor...@googlemail.com> wrote:
> Are you sure you need to capture the state in next-sine? It's not very
> clojure-ly to have functions with state. I would capture the state in
> the caller as an integer and just use get or nth on the lazy seq.
> If you want to stick to your impure function, please mark it with a !
> at the end: next-sine!
>
> On Thu, Oct 14, 2010 at 9:52 PM, clwham...@gmail.com
> <clwham...@gmail.com> wrote:
>> I need a function that produces the 'next' value from a lazy-seq --
>> something like a Python generator. I imagine it would have to be some
>> sort of closure like:
>>
>> (def next-sine
>> (let [sines (atom (cycle (map sin (range 0 6.28 0.01))))]
>> #(swap! sines rest)))
>>
>> Is there a more idomatic way of doing this? I don't see a lot of use
>> of closures in clojure...
>>
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>
>
>
> --
> Moritz Ulrich
> Programmer, Student, Almost normal Guy
>
> http://www.google.com/profiles/ulrich.moritz
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>
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