2010/8/5 Stuart Halloway <stuart.hallo...@gmail.com>
> If records implemented IFn, you could treat them as collections, which they
> are not.
>
Isn't the fact of making records associative for easing the use of treating
them as collections ?
user=> (assoc (user.R. 1) :b 2)
#:user.R{:a 1, :b 2}
user=> (seq (user.R. 1))
([:a 1])
user=>
> There is an asymmetry here: Maps can be used as (impoverished but easy)
> records, but the reverse is not true:
>
> (:foo x) ; x is logically a record (though might be a map for simplicity).
> (x :foo) ; x is a collection (not a record, entity, etc.)
>
> Records not implementing IFn forces you to do what you should do anyway --
> access records with the keyword first.
>
> Stu
>
>
>> Hi BG,
>> It is a common mistake to think that callability, corresponding to the
>> clojure.lang.IFn interface, is part of the persistent map contract
>> (I've done it myself, as did many others a Conj labs :). It is not. It
>> is actually just a feature of clojure.lang.PersistentHashMap (and the
>> other clojure map implementations).
>>
>>
> While I get that part, I wonder why records do not implement IFn, it'd be
> convenient if they did.
>
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