Quick survey 😺 How long does builds take for you folks in average? I am being told node builds take 5-10 minutes and I want to make sure I am not doing anything wrong before answering. At the moment a monorepo build takes 22 minutes and it downloads ~50 deps. I am using shadow-cljs and no m2 caching between builds at the moment.

currently my builds take ~10 mins in CI

we cache the .shadow-cljs dir, node_modules and maybe m2?

I have around ~ 10 repos and on Azure CI which makes it very tough to cache...I mean ...a docker image away I know but still,some work.

I wish I were on CircleCi

is there anyone working on an iOS clojurescript interpreter for iOS like pyhtonista? I saw that Apple's Siri shortcuts allow some amount of coding (https://www.reddit.com/r/shortcuts/comments/9hgblf/pythonista_and_shortcuts/)

Is there such a thing as doing an optimised build without name mangling? I'm after the dead code elimination but would prefer not to pay the price of dealing with externs.

Is it idiomatic in re-frame to directly query the db for something?

or must you dispatch an event?

I'm currently reading certain js properties this way: (let [index (when (pos? (alength elements)) (.-_index (aget elements 0)))]. Now I repeat this for some different properties. How can I pass the .-_index part as a function, so I can do (prop-fn (aget elements 0)?

Ah nvm, I can do (aget foo "_index") and pass the string.

I don't know whether there is a more idiomatic way of doing so though.

@johb.maier the a in aget stands for "array", you can't do this on maps, although it happens to work. It will break in the future.

^ See https://clojurescript.org/news/2017-07-14-checked-array-access

I would be pro for a bot which links that article any time aget is mentioned.

Okay so I won't do that then. But is there a way to abstract over the property name? I don't mind using strings, but how can the -_index part in (-_index obj) be passed as argument?

@johb.maier Instead of (aget foo "_index") do (goog.object/get foo "_index")

If using :advanced and the property name can be renamed, goog.reflect/objectProperty looks promising. (Never used it myself.)

TBH, a challenge with that API is that the property name strings seem to need to be compile-time constants.

I'm not proficient with this (as can be guessed), but I don't think optimization is a problem in my case as they are fixed properties in chartjs.

Thanks, I will use goog.

Yeah, especially if it a foreign lib not being passed through Closure Compiler, :advanced is Ok if you use goog.object/get

@olivergeorge stepping back a bit - there's no need to be concerned about externs

inference works - so I think you're starting with a now old assumption

I haven't written a extern in the past 3 months

Thanks David. That sounds perfect.

@polkafreaku Have you seen the re-view/re-frame-simple project?

you can do things like

db/get-in [:x :y :z]

without the suscription

How do folks package ClojureScript libraries with clj?

what do you mean?

@richiardiandrea Same as clojure? Pack, Sean's depstar etc. ?

hello

w

*wrt to reframe, I can't seem to find what's the second argument passed into reg-sub's computation function

all of the examples I've dug seems to ignore it

what is it?

@wvelezva no I haven't. I'll take a look

@polkafreaku The second argument to the reg-sub computation function is the argument that was passed to rf/subscribe. It's commonly ignored because often the only thing in it is the name of the subscription. If you want to pass more information to your subscription, though, you can do this:

(rf/reg-sub
  :demo/special
  (fn [db [_ extra-stuff]]
    (let [stuff (get-in db [:demo :special])]
      (str stuff extra-stuff))))

(subscribe [:demo/special "Hi, mom"])

@manutter51 I see.

Is there currently a way to target certain components during dispatch?

for example if I have two identical components, each displaying something (like a name maybe), and I want to update just one of the components

sounds like you have two different pieces of state

looks like it, yeah

would you recommend using reframe for a html game then?

I'd like to explore html/css using cljs, but games are notoriously stateful things.

depends on the game, IMO 🙂

I built a simple minesweeper game using just React and a reagent-ish framework I wrote

something that requires a lot of complex graphics & animations you might want to look at using canvas instead of HTML/CSS

with respect to that, I’m not sure how reagent does with canvas today

same as react: you can wrap the canvas in a component but then you are on your own

speaking of which… I’ve been working on a library as a thinner wrapper around React. I just whipped up a quick demo using the material-ui framework and I’m very impressed with how well it works! 😄 https://github.com/Lokeh/hx/blob/master/examples/workshop/material.cljs

OK, here’s a grosser example: using react-dnd https://github.com/Lokeh/hx/blob/master/examples/workshop/react_dnd.cljs

obviously react hooks will make this better w.r.t. not requiring a class component to manage state, but I hope it will also remove the need for these gross HOC chains that so many React libraries promote