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63 lines
2.1 KiB
Markdown
63 lines
2.1 KiB
Markdown
---
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layout: single
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title: "Luau Recap: March 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). It's been a busy month in Luau!
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[Cross-posted to the [Roblox Developer Forum](https://devforum.roblox.com/t/luau-recap-march-2021/).]
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## Typed variadics
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Luau supports *variadic* functions, meaning ones which can take a variable number of arguments (varargs!) but previously there was no way to specify their type. Now you can!
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```
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function f(x: string, ...: number)
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print(x)
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print(...)
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end
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f("hi")
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f("lo", 5, 27)
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```
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This function takes a string, plus as many numbers as you like, but if you try calling it with anything else, you'll get a type error, for example `f("oh", true)` gives an error " Type `boolean` could not be converted into `number`"
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Variadics can be used in function declarations, and function types, for example
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```
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type T = {
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sum: (...number) -> number
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}
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function f(x: T)
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print(x.sum(1, 2, 3))
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end
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```
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## Generic functions
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[TODO]
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## Typechecking improvements
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* Check bodies of methods whose `self` has type `any`
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* More precise types for `debug.*` methods
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* Better typechecking for `Instance:IsA`.
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## Performance improvements
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* Significantly optimized non-variadic function calls, improving performance by up to 10% on call-heavy benchmarks
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* Improve performance of `math.clamp`, `math.sign` and `math.round` by 2.3x, 2x and 1.6x respectively
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* Optimized `coroutine.resume` with ~10% gains on coroutine-heavy benchmarks
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## Library changes
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* 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.
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## New logo
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Luau now has a shiny new logo!
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## Coming soon...
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* Generic variadics!
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* Better treatment of cyclic requires!
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* [Anything else?]
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