Javascript arrays

[Yehonathan Sharvit]

I was surprised when I discovered that the following code worked:

(some #{2} (clj->js [1 2]))
(count (clj->js [1 2]))

My question is: Could javascript arrays be safely passed to core functions that received a vector?

[David Nolen]

Yes JavaScript arrays work with all of the sequence functions.

David

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[Yehonathan Sharvit]

Great!

Will you consider doing the same with javascript objects?

[David Nolen]

We will not. The handling of arrays is in correspondence with Clojure on the JVM.

David

[Gary Trakhman]

I tried to implement cljs protocols over standard javascript objects for angularJS's sake, but it quickly got tedious, and Om was instantly a much more convenient way to go for the sake of mental overhead and just minimizing problems overall :-).  I'm sold on the approach.

here's the code if you want to glance at it: https://github.com/gtrak/quewww/blob/master/src-cljs/cljs_app/js_prot.cljs

In general, it's a fundamental mismatch.  I'm not sure how it feels in something like purnam or if you've worked that way long enough, but here are some tradeoffs to think about.

Wrapper functions/boxing or transparent impls?

Deep or shallow?

Strings or keywords?

When I was thinking about this before, 'specify' did not yet exist, that eases some of the pain.

[Yehonathan Sharvit]

What about js typed arrays?

Why (array? (js/Float32Array. 3)) is false.

(IndexedSeq. (js/Float32Array. 3) 0) seems to work fine.

Will it be safe to modify array? so that it returns true for js typed arrays?

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[Yehonathan Sharvit]

Also, in Clojure on the JVM get works with Java Maps, while in Clojurescript get doesn’t work with js object. 

Is there a reason for that?

[Gary Trakhman]

you can use aget, get requires ILookup.

[szx]

see http://keminglabs.com/blog/angular-cljs-weather-app/ for an example of how to extend ILookup to js objects.

[Gary Trakhman]

The keming article was also my starting point, also the motivation to use angular :-)