I'm working my way through "Programming Clojure" and got an unexpected
result with sequences:
user> (take 10 (filter even? (iterate inc 1)))
(2 4 6 8 10 12 14 16 18 20)
user> (take-while #(< % 10) (iterate inc 1))
(1 2 3 4 5 6 7 8 9)
user> (take 10 (filter #(< % 10) (iterate inc 1)))
; Evaluation
Hi everybody,
I'd like to create a lazy sequence which has first element x and all
the rest from another lazy sequence. I couldn't find a suitable
function in the docs. Can somebody give a hint?
Best regards
PŁ
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On Dec 9, 10:35 pm, Mike K wrote:
> The first two work but the third one hangs. Why?
user> (take 5 (filter #(< % 10) (iterate inc 1)))
(1 2 3 4 5)
OK, I figured out that it won't hang with taking <= 9 elements, which
is the total that pass the filter.
But shouldn't it give me 9 items without
There are only 9 items that satisfy your predicate. (take 10 ...)
demands a 10th, and it keeps searching the (iterate inc 1) stream
forever, endlessly searching for that 10th item it will never find.
On Wed, Dec 9, 2009 at 9:41 PM, Mike K wrote:
> On Dec 9, 10:35 pm, Mike K wrote:
>
>> The firs
> But shouldn't it give me 9 items without hanging when I ask for 10 or
> more as in the first case?
No.
take returns a lazy sequence. The printer is trying to realize it in
order to print it. It can't be completely realized until it's taken
ten elements (at which point it's done, by definiti
> Neither filter nor take know to abandon their attempt. That's how this
> works.
Ah, of course. Thanks Mark and Richard!
Mike
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On Dec 9, 9:46 pm, Mark Engelberg wrote:
> There are only 9 items that satisfy your predicate. (take 10 ...)
> demands a 10th, and it keeps searching the (iterate inc 1) stream
> forever, endlessly searching for that 10th item it will never find.
Aww. You make it sound so sad.
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Is conf what you're looking for?
http://clojure.github.com/clojure/clojure.core-api.html#clojure.core/cons
~Kasper
On 11/30/11 2:27 PM, Paweł Łoziński wrote:
Hi everybody,
I'd like to create a lazy sequence which has first element x and all
the rest from another lazy sequence. I couldn't find
On 30 Lis, 22:31, Kasper Galschiot Markus wrote:
> Is conf what you're looking for?
>
> http://clojure.github.com/clojure/clojure.core-api.html#clojure.core/...
>
> ~Kasper
Of course. Thanks!
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