Just for the record:
Prototype lookup in ClassDefinitionEvaluation changed in draft rev. 14.,
so an API function should rather look like:
Mixin = (base, ...mixins) => mixins.reduce(Object.mixin, class extends
base {}.prototype).constructor
At least users now no longer need to access .prototype manually:
js> class Foo { where(){ return "Foo" } }
js> const BarMixin = { where(){ return "BarMixin" } }
js> (new class extends Mixin(Foo) {}).where()
"Foo"
js> (new class extends Mixin(Foo, BarMixin) {}).where()
"BarMixin"
- André
A tempest in a teapot. We can have better APIs that look nice for this
use-case. Develop some!
But let's not rush them into ES6, or invent custom syntax where API is
enough.
If someone does fast and good work, there's still time for ES6, or 7
(doesn't matter as much as the quality of the work; browsers are
prototyping parts of both).
/be
Dmitry Soshnikov wrote:
>/
/>/ On Jun 11, 2013, at 8:07 PM, Andrea Giammarchi wrote:
/>/
/>>/ if it's about being mature, then this is mature enough, if
/>>/ Object.mixin will be finalized:
/>>/
/>>/ ```javascript
/>>/ class Bar extends [M1, M2, M3].reduce(
/>>/ Object.mixin,
/>>/ Object.create(Foo.prototype)
/>>/ ) {
/>>/ // class definition ...
/>>/ }
/>>/ ```
/>>/
/>>/ I must admit that looks weird though ...
/>>/
/>/
/>/ Exactly - it might be really cool from the language abilities
/>/ perspective, but from the end-users, the example is not that useful:
/>/ if the language provides some abstraction (the "class" abstraction in
/>/ this particular case), the users which will join to JS starting form
/>/ ES6 will have complete right to not even know what that magic
/>/ "prototype" mean -- the one which you expose outside actually breaking
/>/ the class abstraction. The prototype chain is just the implementation
/>/ detail now (and all implementation detail should be hidden in the
/>/ best), not a feature.
/>/
/>/ P.S.: and I still need to choose my English words better :) for the
/>/ mature I probably more meant "syntactically solid" rather than a
/>/ library method.
/>/
/>/ But yeah, I promised not to do big off-topic in this for-of thread.
/>/
/>/ Dmitry/
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