Re: IDBObjectStore/IDBIndex.exists(key)

On Sat, Jun 21, 2014 at 9:45 PM, ben turner <bent.mozilla@gmail.com> wrote:

> I think this sounds like a fine idea.
>
> -Ben Turner
>
>
> On Sat, Jun 21, 2014 at 5:39 PM, Jonas Sicking <jonas@sicking.cc> wrote:
>
>> Hi all,
>>
>> I found an old email with notes about features that we might want to put
>> in v2.
>>
>> Almost all of them was recently brought up in the recent threads about
>> IDBv2. However there was one thing on the list that I haven't seen brought
>> up.
>>
>> It might be a nice perf improvement to add support for a
>> IDBObjectStore/IDBIndex.exists(key) function.
>>
> This sounds redundant with count().

Was count() added to the spec after that note was written? (count() seems
to be a relatively late addition, given that it occurs last in the IDLs)

> This would require less IO and less object creation than simply using
>> .get(). It is probably particularly useful when doing a filtering join
>> operation between two indexes/object stores. But it is probably useful
>> other times too.
>>
>> Is this something that others think would be useful?
>>
>> / Jonas
>>
>
>