mraleph

11 ms·

61.
by mraleph 9y ago
People use Dart on the server and seem to be quite happy with it: see for example https://aqueduct.io/ as an example of homegrown server framework that heavily relies on mirrors. But it is true that mirrors more dead than a
62.
by mraleph 9y ago
I should have stated this more clearly in the post - that it is lazy. I referred to the code itself, but did not explain what the code does very clearly, just said that it has a lot of overhead.
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by mraleph 9y ago
> This all smacks of a language that isn't very mature, at least for general-purpose programming. Could you clarify what "smacks" of a language that isn't very mature? There are libraries written in any language that
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by mraleph 10y ago
> multiple times faster This is an unsubstantiated claim. If LuaJIT was indeed multiple times faster on arbitrary code, everybody would be just running JS on something like LuaJIT in browsers :) LuaJIT does spectacular job on loops, espe
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by mraleph 10y ago
> And slightly off topic, but what are the plans for the dart VM? Is it going to end up using TurboFan or will it stay with Crankshaft? Dart VM is a code base independent of V8, so V8's plans to adopt one or another compiler have no
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by mraleph 10y ago
That seems to be this bug https://github.com/flutter/flutter/issues/6586
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by mraleph 10y ago
> Regarding Flutter [...] none of the devices I own was able to launch the application. Is it still the case that none of your devices are able to launch Flutter Galler App? In an unfortunate coincidence the build that was published to P
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by mraleph 10y ago
if I were to make a bet, I'd say that they don't implement the whole JavaScript and that there is some sort of a static type system which either rejects some programs where types can't be inferred or causes performance to fal
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by mraleph 10y ago
> It's almost like those kuh-razy V8 people I don't get what's the connection between V8, less_dart and naive implementation that `RegExp.matchAsPrefix` had in Dart VM.
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by mraleph 10y ago
I guess I should have been more clear in my advice about not using regular expressions: if you have a tool that allows glueing multiple regular expressions together and erasing the cost of the abstraction (e.g. no allocation of temporary ma
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by mraleph 10y ago
If one heads over to GitHub to check some recently closed issues and recent commits one will discover that there are people who can understand and debug LuaJIT issues. LuaJIT is not magic, it's a software. Very neat and tightly written
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by mraleph 10y ago
I think the question we all should really be asking is how long will it take to get to the point where WASM is practically useful for anything that noticeable chunk of web users cares about.
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by mraleph 11y ago
> http://goto.ucsd.edu/~andrysco/errol/ seems to be the artifact in question. The artifact reveals that authors of the paper benchmarked Grisu3 in the debug mode (low compiler optimization level, ASSERTions e
74.
by mraleph 11y ago
> Do you have any insight on why that still has not been done after so many years? I can't really speak for either V8 or SpiderMonkey but I think there are few reasons - a) nobody got to doing it, even though it was discussed multip
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by mraleph 11y ago
> no edge-case of an implementation can make its way into programmers' habits, something that tends to happen a lot with JavaScript. Edge cases should not, and they almost never do... However performance optimizations is a very spec
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by mraleph 11y ago
> The variable has to be in the local scope and can't be in any higher or lower scope, not just a global scope (which your words acknowledge, but your code snippet doesn't) Sure! I am just trying to say that in my opinion whene
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by mraleph 11y ago
> optimization decisions that the V8 team have made Optimization decisions that V8 team have made are much more universal than it might seem. It is true there are sometimes strange artificial corner cases - but those are often either bug
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by mraleph 11y ago
> Does anyone know how Dart will be affected by web assembly? WebAssembly right now is a suitable target only for C++ like languages. There is a hope that in the future WebAssembly will introduce features enabling efficient compilation o
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by mraleph 11y ago
I am glad you find my stuff useful enough to recommend it to other people! Thanks. I just wanted to point out a minor detail: I am an ex-V8 engineer - I have not been working on V8 since 2012.
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by mraleph 11y ago
Some of this slide is a bit outdated by now. Using Object.seal, Object.freeze and Object.defineProperty with writable, enumerable, configurable not set to true does not cause object named properties convertion to dictionary mode. However th
81.
by mraleph 11y ago
> At the same time, if I'm trying to simplify the test case and set only numeric values and not object ones, I've got nearly the same results: 3.953s and 3.922s for 10x more iterations (prop-benchmark-f.js and prop-benchmark-g.
82.
by mraleph 11y ago
There is a bug in your code: var o = new F(i, i, i, i, i, i, i, i, i, i, z) z = o // ... skipped o.z = z This makes o.z = o, so only the last object survives. When you use constructor you actually link all of
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by mraleph 11y ago
> Is worrying about this for normal web apps just a micro-optimization or can you see instances where this would affect an application's speed significantly? I don't think there is such thing as an average web application so th
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by mraleph 11y ago
It was originally written for the jsconf talk and since has always been sitting in that repo. I was planning to move it out - but never got to it.
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by mraleph 11y ago
ES2015 class does not provide you with a way to declare instance fields. You still create them imperatively in the constructor. Which means for the purposes of the post ES2015 classes are not different from standalone constructor functions
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by mraleph 11y ago
It's done with my original Dart version of Shaky. The CoffeScript version is a port of the Dart version. You can also notice that http://shaky.github.bushong.net/ does not support certain additional features that the p
87.
by mraleph 11y ago
> I guess it's an obvious way to design it. It's an obvious way to design it... if you start with explicitly declared properties in your language. For JavaScript a state-of-art for a long time was more like this: +-------+
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by mraleph 11y ago
I wrote the original code (not this CoffeeScript port) so that I could create simple diagrams fast without resorting much to dragging stuff around with mouse. If you want to create a sequence of diagrams where each next one is just slightly
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by mraleph 11y ago
I should probably update the screencast because I have changed UI since recording it. Mostly changing colors, but also adding few important features, like "interesting mode" which I sometimes demo in the talks[1]. "Interestin
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by mraleph 11y ago
I'd love to work more on it, but sadly it's really outside of my real work right now - as I haven't been working on V8 for several years now. It is past the demo stage though - I know people who use it and it is the only tool

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