Let's not forget that allocations on the JVM are super, super cheap. In the
order of something like 10 cycles. So don't worry so much about throw-away
objects.
Timothy
On Mon, May 13, 2013 at 8:48 AM, Jim <jimpil1...@gmail.com> wrote:
> So the following is not encouraged because we disregard the result of
> calling seq?
>
> (def dummy
> {:a [1 2 3]
> :b [4 5 6]
> :c []
> })
>
> =>(every? seq (vals dummy)) ;make sure all values are non-empty
> false
>
> Jim
>
>
> On 13/05/13 15:08, Meikel Brandmeyer (kotarak) wrote:
>
> Hi,
>
> Am Montag, 13. Mai 2013 13:57:57 UTC+2 schrieb Herwig Hochleitner:
>>
>> 2013/5/13 Meikel Brandmeyer (kotarak) <m...@kotka.de>
>>
>>> seq belongs to seq-land. empty? belongs to data structure land. It
>>> should actually be implemented as #(zero? (count %)). But unfortunately it
>>> is not.
>>>
>>
>> I'd argue it shouldn't
>>
>> (empty? (cycle [1 2 3])) => false
>> (zero? (count (cycle [1 2 3]))) ... infinite loop
>>
>
> You misunderstood my argument. cycle returns a sequence => use seq.
> count is the wrong thing to call here. And calling seq without using its
> return value (with a name) is a smell. count should not be called in
> sequences. (In fact I believe that count should be O(1).)
>
> (Shameless plug in case it clarifies what I mean:
> http://kotka.de/blog/2010/11/Beware_the_unnamed_seq.html )
>
> Meikel
>
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