On Thu, May 10, 2012 at 3:21 PM, Paul DeBruicker <pdebruic@gmail.com> wrote:

On 05/10/2012 04:21 AM, Nicolas Cellier wrote:

Sure, I already changed various Number>>hash and could as well change
Point hash to follow recommendations from Andres valloud book hashing
in smalltalk...

Nicolas

DateAndTime>>#hash could be changed to :

hash
� � � �^ (jdn hashMultiply bitXor: seconds + offset asSeconds) bitXor: nanos

which is 130x faster than whats currently in the image:

hash
� � � �^ self asUTC ticks hash


The collision rate on the proposed hash function is 0.04% ( 4 per 10,000 )