Yuescript
luau
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Yuescript
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Why Fennel?
I'm a big fan of moonscript, but occasionally wish it was still be improved and worked on. Yuescript¹ looks like it fixes most of my bugbears with moonscript, and it is largely a faster² drop-in replacement.
There was s little discussion here ~18 months ago³, but it will largely circular if you look as people are suggesting fennel there ;)
¹ https://github.com/pigpigyyy/Yuescript
² This probably only matters if you have tonnes of moonscript, not just a little neovim/mpv/awesomewm config or something.
³ https://news.ycombinator.com/item?id=29903133
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Using other languages
There's also some languages made to compile straight to Lua: - MoonScript is the most popular Lua wrapper - it's built to be more Python-like, featuring indentation-based scopes, function calls without parentheses, lambda syntax, list comprehension, and much more. - Yuescript is a modern update to MoonScript that adds more features (I haven't used it myself, so I'm not entirely sure exactly how it differs from MS). - Teal is a version of Lua that adds static typing for better code standards.
- data types in function definition
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Lua, a Misunderstood Language
Yes, this is unfortunately true.
There's a spiritual successor: https://yuescript.org/
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I've designed a re-imagined version of the Lua logo and some other Lua flavors just for fun, what do you guys think?
Yuescript in yellow
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100 Languages Speedrun: Episode 90: YueScript
What I didn't know about is that its fork YueScript is actively maintained, and with some extra features.
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Trying to move to Emacs again
I've put together a Lua config with Neovim, but it was still kind of obnoxious to put together. Lua isn't that great of a language, because people seem to forget it's an embed-able language for a reason (it's not supposed to give you tons of features). Using something that makes some of your more complex problems easier like Moonscript or Yuescript can make things more complex in regards to your configuration.
luau
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Building a baseline JIT for Lua automatically
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.
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Pluto, a Modern Lua Dialect
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/
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Buzz: A lightweight statically typed scripting language
If you need Lua but also type-safety, how about Luau [1] then?
[1] https://luau-lang.org/
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Lua Criticism Is Unwarranted
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
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Ask HN: Looking for platforms, other than Roblox, that have adopted Luau
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.
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Embeddable Common Lisp 23.9.9
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.
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Creating a simple sandboxed language
Luau - Lua variant by Roblox
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The Warframe Lexicon for Updates
On a side note, I've heard that they recently switched from Lua to Roblox's own fork of Lua, Luau.
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Lua: The Little Language That Could
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
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Scripting Resources MegaThread
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
What are some alternatives?
moonscript - :crescent_moon: A language that compiles to Lua
lua-languages - Languages that compile to Lua
kakoune - mawww's experiment for a better code editor
LuaJIT - Mirror of the LuaJIT git repository
emacs-pure
moonsharp - An interpreter for the Lua language, written entirely in C# for the .NET, Mono, Xamarin and Unity3D platforms, including handy remote debugger facilities.
open-builder - Open "Minecraft-like" game with multiplayer support and Lua scripting support for the both client and server
lua-language-server - A language server that offers Lua language support - programmed in Lua
dotemacs - My Emacs configuration
tl - The compiler for Teal, a typed dialect of Lua
forkleft - Fegeya Forkleft, C++ implementation of ~new generation~ mark-up language.