encapsulated hash codes
mjs at apple.com
Wed Nov 4 16:50:12 PST 2009
On Nov 4, 2009, at 2:49 PM, Allen Wirfs-Brock wrote:
> A straw man proposal for Harmony encapsulated hash codes has been
> posted to the Wiki athttp://wiki.ecmascript.org/doku.php?id=strawman:encapsulated_hashcodes
1) Wouldn't it be simpler to have a single Object.hash() function that
returns a uniformly distributed number in the 0..2^32 range, and leave
the mod operation up to code using the hash code? Making a new
function that (essentially) encapsulates the hash operation and the
mod does not seem to pull its weight in API complexity.
2) What about non-objects? It would be nice if strings, numbers, and
perhaps other primitive types could hash by value rather than by
identity, so you could reasonably mix them as hash keys with objects.
3) Security considerations: it should be recommended that the hash
code, if computed from the address of the object, is not reversible.
(Of course, with a copying collector you probably can't compute the
hash code from the address).
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the es-discuss