> On Oct 15, 2016, at 8:34 PM, Dave Abrahams via swift-evolution
> <swift-evolution@swift.org> wrote:
>
>
> on Fri Oct 14 2016, Paul Cantrell <swift-evolution@swift.org
> <mailto:swift-evolution@swift.org>> wrote:
>
>> A late-arriving strong +1 for me. The index-related stuff is elegant and
>> much needed. I’m surprised
>> to learn that dict.keys and dict.values are copies and not already
>> views!
>
> They are views.
Oh, OK. I stand … er, type … corrected! I was thinking of this bit of the
proposal:
> this approach requires a linear search through a dictionary's keys to find a
> match.
>
> if dict.keys.contains("one") {
I had wrongly assumed in the past that contains() would forward to an efficient
lookup against the underlying dictionary. That’s what surprised me. It clearly
deserves fixing.
>From that, I made the incorrect leap to assuming that dict.keys made a copy.
>On more careful rereading and a visit to the docs for LazyMapCollection, the
>problem is much clearer to me now! Thanks as always for setting me right on
>the details.
Cheers, P
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