dotnet VS luau

Not https://github.com/CommunityToolkit/dotnet

Here's some: - MVVM Toolkit - PolySharp - ComputeSharp

Started programming by writing some apps for Windows Phone later UWP during university. A few years ago I started collaborating a lot on GitHub to some Microsoft projects, like the Windows Community Toolkit. There I created a lot of new APIs and libraries, like all the new animation APIs and pipeline brush APIs, etc. I then also proposed adding some general .NET APIs to it, and that's how the MVVM Toolkit was born, along with other libraries which are now moved to the .NET Community Toolkit. Fast forward until about late 2020, and they pinged me saying the new Microsoft Store (which hadn't been announced yet back then) was using several of those new APIs I had written, so we started collaborating more so that I could add more functionality they needed. After that shipped, at some point there was a new opening to which I applied, and here I am in the Microsoft Store team and also leading the .NET Community Toolkit 🙂

This is tracked by https://github.com/CommunityToolkit/dotnet/issues/409. The issue is likely that AppCenter image using an older version of Visual Studio (and Roslyn). The MVVM Toolkit needs at least Roslyn 4.0 (ie. Visual Studio 2022) in order to work. Unfortunately this is not something we can change from the MVVM Toolkit, you have to open a support request for AppCenter to ask for a newer Roslyn version, or see if there is a way for you to enable that in your pipeline 🥲

The toolkit's:

https://github.com/CommunityToolkit/dotnet/issues/224 - one ask and fix.

Yeah, the fact properties use fields with annotations right now isn't ideal, it's just the best we could do until C# gets partial properties. I do plan on adding support for that though as soon as C# gets that feature. You can follow the progress here 🙂

For comparison, CommunityToolkit.Diagnostics has a guard library.

There is some stuff in CommunityToolkit to lower allocations of frequently converted Spans, StringPool comes to mind.

Most likely this: https://github.com/CommunityToolkit/dotnet/blob/main/src/CommunityToolkit.Mvvm/DependencyInjection/Ioc.cs

As far as I can tell, they aren't.

http://lua-users.org/wiki/SandBoxes

There is a lot of information there, but it doesn't handle resource exhaustion, execution time limits or give any guarantees. It does indicate that it's possible, and has a decent example of the most restrictive setup, which is a good start. But I would for example compare it with Luau's SECURITY.md.

From https://github.com/luau-lang/luau/blob/master/SECURITY.md:

> Luau provides a safe sandbox that scripts can not escape from, short of vulnerabilities in custom C functions exposed by the host. This includes the virtual machine and builtin libraries. Notably this currently does not include the work-in-progress native code generation facilities.

> Any source code can not result in memory safety errors or crashes during its compilation or execution. Violations of memory safety are considered vulnerabilities.

> Note that Luau does not provide termination guarantees - some code may exhaust CPU or RAM resources on the system during compilation or execution.

So, even luau will have trouble with untrusted code, but it specifies exactly what happens and so on. I think that's fair enough.

Alternatively, Luau is a well-supported Lua variant with type checking and performance improvements, aimed more towards being a sandboxed embedded scripting environment.

https://luau-lang.org/

If you need Lua but also type-safety, how about Luau [1] then?

[1] https://luau-lang.org/

I had the pleasure of working with Lua 5.1 back in the late noughties. For me it's replaced Tcl whenever I want something I can configure above a C library. At the time I used it I found it quite nice but I'll also not forget the hours I wasted tracking down nil table corruptions which could have easily been caught by a type checker.

I had some hope that Luau https://luau-lang.org or Teal https://github.com/teal-language/tl would make things better but with the following example

    function foo(x: number): string

Looking at other replies here, I can see I wasn't the only one who didn't realize there is Lua and Luau. Luau is an extension of Lua: https://luau-lang.org/

> Luau is syntactically backwards-compatible with Lua 5.1 (code that is valid Lua 5.1 is also valid Luau); however, we have extended the language with a set of syntactical features that make the language more familiar and ergonomic.

Lua is usually the embedded language of choice. If you are focused on security, you could check out the Roblox fork, Luau (https://github.com/Roblox/luau) where the creators took extra care to lock down the language on what scripts could do.

Luau - Lua variant by Roblox

On a side note, I've heard that they recently switched from Lua to Roblox's own fork of Lua, Luau.

https://www.youtube.com/results?search_query=luau+roblox&sp=...

Luau

https://github.com/Roblox/luau

Roblox wrote a superset of Roblox Lua which is way faster

https://luau-lang.org/ - some documentation, and examples https://create.roblox.com/docs - documentation, tutorials, and examples https://www.youtube.com/user/AlvinBLOX - tutorials https://www.youtube.com/@TheDevKing/videos - tutorials https://www.lua.org/manual/5.1/ - not specific to Roblox, but Lua reference manual https://www.codecademy.com/learn/learn-lua - Lua on Codecademy