On 2010 Apr 6, at 9:09 AM, Christophe Grand wrote:
On Mon, Apr 5, 2010 at 4:54 PM, Douglas Philips <d...@mac.com> wrote:
Immutability is orthogonal to reference-ness.
There is nothing "wrong" with having immutable cyclic graphs of
values.
There is something wrong with immutable cyclic data structures: an
undefined (or unexpected) behaviour on update because of identity
and state being conflated again.
... details elided ...
This is not exactly the expected result. The result is confusing
because the cyclic reference must be to the identity of the user
account not to its actual value.
(def john-doe {:name "John Doe" :email "j...@doe.com"})
(def account {:identity john-doe :balance 100} )
(assoc john-doe :email "john.doe at gee mail.com")
Now the account contains old/obsolete data and no cycles are needed to
cause that.
Doesn't seem that cycles are the problem...
-Doug
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