Luau Recap April 2021 (#28)

* Base for the April post * Finished April 2021 recap post * Removed features that are not enabled yet (bye, type-checking section) * Update docs/_posts/2021-04-30-luau-recap-april-2021.md Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com> * Update docs/_posts/2021-04-30-luau-recap-april-2021.md Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com> * Update docs/_posts/2021-04-30-luau-recap-april-2021.md Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com> * Added 'Coming Soon' for type refinements Co-authored-by: Arseny Kapoulkine <arseny.kapoulkine@gmail.com>
2025-04-03 18:30:54 +01:00 · 2021-05-03 23:05:05 +03:00 · 2021-05-03 23:05:05 +03:00 · b8627707c4
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+---
+layout: single
+title:  "Luau Recap: April 2021"
+---
+
+Luau is our new language that you can read more about at [https://roblox.github.io/luau](https://roblox.github.io/luau). Another busy month in Luau with many performance improvements.
+
+[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-april-2021/).]
+
+## Editor features
+
+Luau implementation now provides an internal API for type-aware autocomplete suggestions.
+
+Roblox Studio will be the first user of this API and we plan for a new beta feature to come soon in addition to existing Luau-powered beta features like Go To Declaration, Type Hovers and Script Function Filter (you should check those out!)
+
+## Performance improvements
+
+Performance is a very important part of Luau implementation and we continue bringing in new performance optimizations:
+
+* We've finished the work on internal `vector` value type that will be used by `Vector3` type in Roblox. Improvements of up to 10x can be seen for primitive operations and some of our heavy `Vector3` benchmarks have seen 2-3x improvement. You can read more about this feature [on Roblox Developer forums](https://devforum.roblox.com/t/native-luau-vector3-beta/)
+* By optimizing the way string buffers are handled internally, we bring improvements to string operations including `string.lower`, `string.upper`, `string.reverse`, `string.rep`, `table.concat` and string concatenation operator `..`. Biggest improvements can be seen on large strings
+* Improved performance of `table.insert` and `table.remove`. Operations in the middle of large arrays can be multiple times faster with this change
+* Improved performance of internal table resize which brings additional 30% speedup for `table.insert`
+* Improved performance of checks for missing table fields
+
+## Generic functions
+
+We had to temporarily disable generic function definitions last month after finding critical issues in the implementation.
+
+While they are still not available, we are making steady progress on fixing those issues and making additional typechecking improvements to bring them back in.
+
+## Debugger improvements
+
+Debugging is now supported for parallel Luau Actors in Roblox Studio.
+
+Read more about the feature [on Roblox Developer forums](https://devforum.roblox.com/t/parallel-lua-beta/) and try it out yourself.
+
+## Behavior changes
+
+Backwards compatibility is important for Luau, but sometimes a change is required to fix corner cases in the language / libraries or to improve performance. Even still, we try to keep impact of these changes to a minimum:
+
+* __eq tag method will always get called for table comparisons even when a table is compared to itself
+
+## Coming soon...
+
+* Better type refinements for statements under a condition using a new constraint resolver. Luau will now understand complex conditions combining `and`/`not` and type guards with more improvements to come