On Thu, Sep 26, 2013 at 1:49 AM, Marshall Bockrath-Vandegrift
<[email protected]> wrote:
> Vincent Chen <[email protected]> writes:
>
>> - Use something else than records to model structs (suggestions welcome)?
>
> Maps.
>
> Records have concrete Java types, which allows them to implement
> interfaces and participate in protocols. Fields defined on a record
> type are backed by JVM object fields, which can increase performance.
> But there are no strictness benefits – a record may have any number of
> additional keys associated to values:
>
> (defrecord Foo [bar])
> ;;=> user.Foo
> (map->Foo {:bar 1, :baz 2})
> ;;=> #user.Foo{:bar 1, :baz 2}
> (class (map->Foo {:bar 1, :baz 2}))
> ;;=> user.Foo
>
> So my suggestion would be to instead turn your `struct` definitions into
> functions validating that the expected fields are present within plain
> maps. (Assuming some sort of strictness/validation is the goal.)
>
Thanks for the suggestions.
My records (structs) do actually implement protocols, since the
structs represent something which has to be sent over the wire.
Clojure being a dynamic language means that I have to specify the
types of each field of a struct, and I do it as part of a protocol
implemented by the records.
If I'm getting you correctly, you're suggesting that instead of
(defrecord Foo [a b c])
I should rather have
(defn make-foo [a b c]
{:a a, :b b, :c c})
? That could work, even though I had tried to avoid having to do this
when I started. I guess rather than protocols I'll just use
multimethods instead.
Thanks for your help,
Vincent
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