Re:What computer and software is used by the Falcon 9? (2015)
by davedx on Sunday May 31, 2020 @08:40AM
(#23369192)
You haven’t made any arguments about why Javascript isn’t good for building UIs there. Here’s mine for why it is:
- first class functions (callback style is a good fit for UI programming)
- async/await and single threaded - many components of UIs are async by nature, Javascript supports you well here while keeping things simple with its single threaded model
Re:What computer and software is used by the Falcon 9? (2015)
by heavyset_go on Sunday May 31, 2020 @03:40PM
(#23372050)
Sharing the UI thread with logic is something to be mitigated when building UIs, it's not a feature.
Re:What computer and software is used by the Falcon 9? (2015)
by davedx on Monday June 01, 2020 @08:33AM
(#23377759)
In theory, maybe. In practice, your UI thread very rarely has to do the kind of heavy lifting that would block it so badly you actually have problems.
I have encountered this -- for example parsing very large incoming JSON payloads -- but very rarely. And if you really need to mitigate it, there are webworkers.
Re:What computer and software is used by the Falcon 9? (2015)
by vertex-four on Sunday May 31, 2020 @10:52AM
(#23369928)
There's... a large number of languages with both of those features.
Re:What computer and software is used by the Falcon 9? (2015)
by scotty79 on Sunday May 31, 2020 @04:35PM
(#23372495)
Could you name few better than js?
Re:What computer and software is used by the Falcon 9? (2015)
by vertex-four on Sunday May 31, 2020 @05:45PM
(#23373054)
In the context of writing reliable software for a spacecraft? Pretty much anything with a reasonable type system, for a start. Maybe C#, or some reasonable subset of C++20, or Rust. Maybe Reason or OCaml.
Re:What computer and software is used by the Falcon 9? (2015)
by errantspark on Sunday May 31, 2020 @07:28PM
(#23373988)
I mean very clearly the good people at SpaceX have heard of these languages and decided against it. I think JS and Chromium are the best UI kit I can think of in terms of man hours to get X done. If you're careful the only thing I've ever had issues with is latency, but in space if you're in a situation where missing a frame or two is important you're already beyond fucked.
Re:What computer and software is used by the Falcon 9? (2015)
by zeroc8 on Monday June 01, 2020 @03:27AM
(#23376097)
From my experience, Qt/QML is way better for things like that.
I mean, the UI does not need to be responsive, does it?
Maybe they couldn't afford the Qt license.
Re:What computer and software is used by the Falcon 9? (2015)
by davedx on Monday June 01, 2020 @08:40AM
(#23377809)
Many people are using TypeScript these days, it works very well.
I like C# and Rust too. I've built UI's in C++ and MFC/OpenGL/DirectX. It remains my fairly strong opinion that JavaScript is well suited to UI development.
I disagree. It is easy to build something presentable with HTML and browsers, and there have been many JS frameworks that lower the barrier. However, that is not because JS is a good language for it; it is because JS is the only language available in that environment.
In fact, there are at least two other languages that transpile to JS, because you need JS to be able to run in a browser. But JS the language is not good enough, so you want two write your code in something else.
Building a UI in a completely different language, without a browser, is definitely harder, but you might have several advantages in the other, non-UI parts.