Alex, it's funny that the example you showed about using the new extension
mechanism looks very much like implementing lifecycle hooks in React.js
(and the various CLJ/CLJS wrappers).
Indeed having value-based extension makes it much more flexible than having
to use deftype/defrecord. My understanding is that since it's based on
metadata, one could extend after the fact with `reset-meta!`/`alter-meta!`
right?
On Tuesday, November 6, 2018 at 2:42:45 PM UTC+1, Alex Miller wrote:
>
> 1.10.0-beta5 is now available.
>
> You can try it with clj using:
>
> clj -Sdeps '{:deps {org.clojure/clojure {:mvn/version
> "1.10.0-beta5"}}}'
>
> Changes in 1.10.0-beta5:
>
>
> - In addition to prior methods of extension, values can now extend
> protocols by adding metadata where keys are fully-qualified symbols naming
> protocol functions and values are function implementations. Protocol
> implementations are checked first for direct definitions (defrecord,
> deftype, reify), then metadata definitions, then external extensions
> (extend, extend-type, extend-protocol). datafy has been updated to use
> this
> mechanism.
> - `symbol` can now be passed vars or keywords to obtain the
> corresponding symbol
> - CLJ-2420 <https://dev.clojure.org/jira/browse/CLJ-2420> error
> reporting enhancements - more refined phase reporting, new
> clojure.main/ex-triage split out of clojure.main/ex-str, execution errors
> now report the top *user* line in the stack trace omitting frames from
> core, enhancements to providing file and line via meta on a form
> - CLJ-2425 <https://dev.clojure.org/jira/browse/CLJ-2425> add java 11
> javadoc url
> - CLJ-2424 <https://dev.clojure.org/jira/browse/CLJ-2424> fix test bug
> from CLJ-2417
>
> You can read the full 1.10 changelog here:
> https://github.com/clojure/clojure/blob/master/changes.md
>
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