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47 lines
2.8 KiB
Markdown
47 lines
2.8 KiB
Markdown
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---
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layout: single
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title: "Luau Recap: April 2021"
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---
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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.
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[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-april-2021/).]
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## Editor features
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Luau implementation now provides an internal API for type-aware autocomplete suggestions.
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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!)
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## Performance improvements
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Performance is a very important part of Luau implementation and we continue bringing in new performance optimizations:
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* 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/)
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* 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
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* Improved performance of `table.insert` and `table.remove`. Operations in the middle of large arrays can be multiple times faster with this change
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* Improved performance of internal table resize which brings additional 30% speedup for `table.insert`
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* Improved performance of checks for missing table fields
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## Generic functions
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We had to temporarily disable generic function definitions last month after finding critical issues in the implementation.
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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.
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## Debugger improvements
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Debugging is now supported for parallel Luau Actors in Roblox Studio.
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Read more about the feature [on Roblox Developer forums](https://devforum.roblox.com/t/parallel-lua-beta/) and try it out yourself.
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## Behavior changes
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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:
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* __eq tag method will always get called for table comparisons even when a table is compared to itself
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## Coming soon...
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* 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
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