Thanks Ken .. "into" is cool .. it does better..
Sunil.
On Tue, Mar 22, 2011 at 4:09 PM, Ken Wesson <kwess...@gmail.com> wrote:
> 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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