The goal with your library is to transmit deltas between two systems, and
then apply those deltas to the other system to make them match, yes?
How would you use the diff return value ({:x {:y 1}} nil nil) to cause a
system that currently has {:x {:y 1}} to change to {:x {}}, as opposed to
some other state? That is, how would it know it needs to change the value
associated with :x to {} as opposed to removing the key :x and its value
entirely?
Andy
On Fri, Feb 20, 2015 at 5:34 PM, Timothy Pratley <[email protected]>
wrote:
> On Fri, Feb 20, 2015 at 4:40 PM, Andy Fingerhut <[email protected]>
> wrote:
>
>> Why not ({:x {:y 1}} {:x {}} nil) ?
>>
>
> Hi Andy,
>
>
> Great point! Both solutions convey accurately the same meaning? I have a
> subjective preference to nil as the absence of things in b that are not in
> a. Conversely {:x {}} implies that :x is replaced by an empty map, which is
> indeed equivalent, but to my mind the map was always there. It does call
> out the fact that the collection is now empty, which might be useful if one
> was interested in identifying that condition.
>
> Do you have any thoughts on why {:x {}} might be better?
>
>
> Regards,
> Timothy
>
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