does anyone know how to require functions from this ns? https://github.com/clojure/clojurescript/blob/master/src/main/cljs/clojure/data.cljs

i've tried things like (use 'cljs.clojure.data), (require 'cljs.data), etc

clojure.data

go by the name given in the ns form

(use 'clojure.data) throws an error. something i'm missing here?

in cljs repl

oh hey i got it working by adding clojure.data to the namespace form, outside of the repl

thanks

()

@anmonteiro Wouldn't it make sense to squeeze the "module which is not package" cases close to :npm-deps and index all the things in one go?

Does anyone have any links to documentation about monitoring atoms and memory usage? I’ve got a situation where I think I’m doing something a bit odd and it’s causing big garbage collection pauses

Also, the project is using Matter.JS as a physics engine, and I’ve got lots of references to JS objects that it creates and updates. Would there be any particular issues with storing these in a map in a global state atom?

@bunkers Chrome DevTools’s Memory tools do not work for you?

well I’ve been profiling with that, but the output is a bit incomprehensible for me! That’s why I was wondering if there was any tutorials for using tools like that to profile ClojureScript

I doubt you will find anything better than that 😕

I think I’m probably using it wrong, and/or need a better understanding of it. It chucks out a load of stuff but I can’t see how it relates to the objects and data structures in my clojurescript code

you could hand-roll something to track number of your atoms and how much is stored there, I would double check that you don’t keep references to “historical” objects, so that each frame you release all garbage properly

have you got any pointers on using the memory profiling in dev tools?

no, I’m sorry

no problem, I’ll try sticking in some logging like you suggest

@gmercer (def format js/goog.string.format), but that assumes that you required the goog.string.format package correctly

or goog.string?

let me look where exactly it is provided

I have the require done

#?(:cljs [goog.string.format :as gsf]) )

was hoping for

#?(:cljs
       [goog.string.format :as format])
    )

this case is a bit tricky: https://github.com/google/closure-library/blob/master/closure/goog/string/stringformat.js#L39

it is provided in goog.string.format, but adds format method on goog.string

so this require should work: [goog.string.format] [goog.string :refer [format]]

gimme a sec

or use [goog.string.format] [goog.string :as gstr] and then gstr/format

or just [goog.string.format] and then js/goog.string.format, because goog.string.format pulls in goog.string implicitly: https://github.com/google/closure-library/blob/master/closure/goog/string/stringformat.js#L27

not having any luck with the :refer suggestion .. I was hoping to leave the current clj alone - the def seems to be doing the trick

or [goog.string.format :as format] might work as well

that doesn't work .. I think that was one of my first attempts

yep, I think the problem is that goog.string.format is both namespace and a method

I’m 100% sure [goog.string.format] [goog.string :as gstr] and then gstr/format worked for me at some point in the past

IIRC think :refer only works for CLJS

you can do then (def format gstr/format) and call it a day, no?

I can live with the def .. which is better than reader hacking all of the working clj code

I think your best bet is to require [goog.string.format] and then (def format js/goog.string.format)

> I’m 100% sure [goog.string.format] [goog.string :as gstr] and then gstr/format worked for me at some point in the past

this works fine and is better than pull it into a local var

defing seems the best when working with an exiting clj codebase

Is there an interop form for async/await from es7?

@dominicm no we compile to ES3

How do you test for exception on cljs.test?

(is (thrown? js/TypeError ....)

for example

Does cljs allow defining one protocol implementation for multiple types with this syntax: (extend-protocol IFoo BarType BazType (foo [_]...))?

trying to do the cljs equivalent of viewer.open({tileSource: "/dzi/testdz.dzi"}); what I currently have

(. js/viewer (open "{tileSource:
\"/dzi/testdz.dzi\"}"))

I need to pass json with a string to the js object

not a whole string

(.open js/viewer #js {:tileSource "string"})

looking for some examples of passing cljs functions to be invoked as js callbacks

nothing special about it (js/setTimeout some-cljs-fn 1000)

(js/setTimeout (fn [] (println "hello")) 1000)

thanks, I meant passing cljs functions to js as callbacks (onsuccess, onfailure, etc.)

what is the difference?

setTimeout is a js function expecting a callback as the first param

quite correct, thank you

Trying to translate a bit of JS into CLJS...

var imageData = context2d.createImageData(width, height);
imageData.data.set(new Uint8ClampedArray(bufferToReturn));
context2d.putImageData(imageData, x_offset, y_offset);

I'm getting a blank canvas atm

@john that looks fine, is buffer-to-return a js or clj data structure?

@oahner I've tried passing it a (js/Float32Array. [0 1 2 3 4 5]) and (.-buffer ... version of that. I can see there is data in the array I'm passing to the UInt8ClampedArray constructor. I must not be using the constructor right.

right

(js/Float32Array. #js [0 1 2 3 4 5])

it's the Uint8ClampedArray that's constructed wrong

mdn says it takes an object. To pass a buffer, it says, new Uint8ClampedArray(buffer [, byteOffset [, length]]); ... Does that mean I should do (js/Uint8ClampedArray buffer #js [0 #js [4]])?

imageData.data.set is TypedArray.set, it can take a TypedArray instance or a regular array

(.set (.-data imageData) #js [0 1 2 3 4 5])) should work

@oahner rgr, I'll give it a shot. thanks

@oahner Oh, also, I'm trying to send arrays to and from web workers and so I need to send the Transferable ArrayBuffer. Is there a way to pass the ArrayBuffer in instead? Or convert the ArrayBuffer back into an Array?

Basically, trying to do as much of the image prep on the worker side as possible, and just feed the finished buffer into the canvas context on the main thread side.

you can pass typed arrays around with postMessage

postMessage isn't liking specific TypedArrays. Chrome only seems to send ArrayBuffers

@john you can get the underlying buffer with TypedArray.prototype.buffer and send that

@oahner Thanks. Any idea how to convert an ArrayBuffer back into the TypedArray?

don't they all take an arraybuffer as constructor arg?

(js/Int32Array. buffer)?

I need to call js constructor as a function, how do I do that? e.g. (apply js/Date. x) won’t work

or in other-words: I need to pass vector of things into js constructor? How do I do that?

or in other-words, I need to translate something like this to Clojurescript syntax:

new (Function.prototype.bind.apply(Date, [null, "2008-10-10"]))

any ideas?

(let [x (js/Function.prototype.bind.apply js/Date #js [nil, "2008-10-10"])] (x.))

btw. why don’t you simply call date’s constructor like this? new Date("2008-10-10") ah ok, that was just an example