On Tue, Mar 22, 2011 at 5:08 AM, Shantanu Kumar
<kumar.shant...@gmail.com> wrote:
> On Mar 22, 1:15 pm, Sunil S Nandihalli <sunil.nandiha...@gmail.com>
> wrote:
>> Hello everybody,
>> I was wondering why there is no 1 argument version of conj and disj. I
>> think that would be very convenient. Especially when used in the following
>> way
>>
>> (apply conj some-collection collection-of-elements-to-be-conjed)
>>
>> Currently the above usage would fail for both conj and disj when the
>> collection of elements to be conjed is empty . So, I need to check if the
>> collection is empty and use appropriately.. but just thought having conj and
>> disj just return the original collection when there are no keys to be conjed
>> or disjed would be very convenient
>>
>> May be I should be using something else .. I would like to what that other
>> function is.
>
> Maybe these:
> user=> (reduce conj [] [1 2 3 4])
> [1 2 3 4]
> user=> (reduce disj #{1 2 3 4} [1 2 3 4])
> #{}
>
> Is that what you were looking for?
(into existing-coll coll-of-new-elements) works as well; and on my
copy of 1.2, (apply disj #{1 2 3 4} []) works. (Thus making the
failure of (apply conj x []) seem all the stranger.)
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