(seq x) will return a sequence if x is not empty, regardless of what
type x was, e.g., (seq [1 2 3]) => (1 2 3)
(not-empty x) will return the original collection if it is not empty,
e.g., (not-empty [1 2 3]) => [1 2 3]
If you need a sequence, you'll want to use seq; if you need the
original collection type, you'll want to use not-empty.
On Mon, Jan 7, 2013 at 1:47 PM, Alexander Pugachev
<alexander.pugac...@gmail.com> wrote:
> Hi,
>
> sorry for touching this subject, but I have a question which looks to me
> related to the thread.
>
> There is not-empty function in the sequences library.
> If not-empty is there should we use it instead of (seq c) to check if a
> sequence is not empty?
> The doc does not propose to use (not-empty c) instead of (seq c) but what is
> the reason of having not-empty then?
>
> Thanks.
>
> воскресенье, 14 марта 2010 г., 0:22:32 UTC+2 пользователь Meikel Brandmeyer
> (kotarak) написал:
>>
>> Hi,
>>
>> On Fri, Mar 12, 2010 at 08:25:23AM +1100, Alex Osborne wrote:
>>
>> > The list equivalent to the vec or set functions is (apply list ...) --
>> > there's no shorthand for it as you shouldn't be using lists much
>> > explicitly, use a vector instead.
>>
>> In fact there is a short-hand:
>>
>> user=> (seq [])
>> nil
>> user=> (vec [])
>> []
>> user=> (set [])
>> #{}
>> user=> (sequence [])
>> ()
>>
>> Sincerely
>> Meikel
>
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