Oops, sorry. It seems weird to me that a function called select-keys would
take a single parameter and not a vector. Also, as you said, this does seem
like it would require some kind of check which would probably not worth the
tradeoff. Why not write a function called select-key that does what you
want?
On Sat, Feb 21, 2009 at 6:24 PM, Mark Volkmann <r.mark.volkm...@gmail.com>wrote:
>
> On Sat, Feb 21, 2009 at 5:07 PM, David Nolen <dnolen.li...@gmail.com>
> wrote:
> > dissoc is like assoc.
> > If you want to use collections with dissoc you can always use apply. It's
> > not too much to type:
> > (def my-map {:first "Bob", :middle "Joe", :last "Smith"})
> > (apply dissoc my-map [:first :middle])
>
> I think you misunderstood what I want. I want to be able to pass
> individual keys to select-keys. I'm not looking for a way to pass
> collections of keys to dissoc and assoc.
>
> My guess is that this inconsistency was purely accidental and could be
> fixed so select-keys also accepts individual key arguments.
>
> > On Sat, Feb 21, 2009 at 5:58 PM, samppi <rbysam...@gmail.com> wrote:
> >>
> >> Allowing dissoc and select-keys to accept both keys as arguments and
> >> as a collection would be nice, and backwards compatible. In any case,
> >> ostensibly it should be consistent; otherwise, it's just an
> >> idiosyncrasy in the language that people will have to deal with. I
> >> wonder what the reasoning is behind it, or if it was completely
> >> arbitrary.
> >>
> >> On Feb 21, 1:28 pm, Mark Volkmann <r.mark.volkm...@gmail.com> wrote:
> >> > (def popsicle-map {:red :cherry, :green :apple, :purple :grape})
> >> >
> >> > ; Note how the keys passed to dissoc are individual arguments.
> >> > (dissoc popsicle-map :green :blue) ; -> {:red :cherry, :purple :grape}
> >> >
> >> > ; Note how the keys passed to select-keys are in a vector, not
> >> > individual arguments.
> >> > (select-keys popsicle-map [:red :green :blue]) ; -> {:green :apple,
> >> > :red :cherry}
> >> >
> >> > I wonder why these were implemented differently. Maybe both dissoc and
> >> > select-keys should accept both individual key arguments and a sequence
> >> > of keys.
>
> --
> R. Mark Volkmann
> Object Computing, Inc.
>
> >
>
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