On 23 November 2010 19:01, Ken Wesson <kwess...@gmail.com> wrote:
> On Tue, Nov 23, 2010 at 7:49 AM, Laurent PETIT <laurent.pe...@gmail.com> 
> wrote:
>> try
>> (def x #(iterate inc 1))
>> (take 1 (drop 1000000000 (x))
>>
>> if you do not want to blow up the memory.
>
> I wonder if an uncached lazy seq variant that cannot hold onto its
> head would be useful to have in core?

Such a thing would surely be a very dangerous structure to have around.

Clojure's approach is one of immutability and minimal global state,
and a non-cached lazy seq would either have to generate the whole
sequence up to the last value required every time it was accessed, or
it would be creating a  nasty implicit side effect in the var, as the
seq would need to lose the new value each time it was accessed.


R.

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