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luau/docs/_posts/2021-03-29-luau-recap-march-2021.md
ajeffrey@roblox.com 2b22827113 Fleshed out Luau Recap for March 2021
2021-03-29 16:38:55 -05:00

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single Luau Recap: March 2021

Luau is our new language that you can read more about at https://roblox.github.io/luau. It's been a busy month in Luau!

[Cross-posted to the Roblox Developer Forum.]

Typed variadics

[TODO]

Generic functions

[TODO]

Typechecking improvements

  • Check bodies of methods whose self has type any
  • More precise types for debug.* methods
  • Better typechecking for Instance:IsA.

Performance improvements

  • Optimized coroutine.resume (a 10% speed-up in benchmarks)
  • New implementation of string mutations, which mutates in place rather than copying if there's only one copy of the string buffer (a 20% speedup)
  • New FASTCALL specializations, optimizing common cases for methods such as table.insert (a 40% speedup)
  • Improved table.move performance (often 3x faster!)

Library changes

  • Added the debug.info function which allows retrieving information about stack frames or functions; similarly to debug.getinfo from Lua, this accepts an options string that must consist of characters slnfa; unlike Lua that returns a table, the function returns all requested values one after another to improve performance.

Luau now has a shiny new logo!

!["New logo!"]({{ site.url }}{{ site.baseurl }}/assets/images/luau.png)

Coming soon...

  • Better treatment of cyclic requires
  • [Anything else?]