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First draft write-up of typed variadics

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ajeffrey@roblox.com 2021-03-29 17:24:26 -05:00
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docs/_posts/2021-03-29-luau-recap-march-2021.md
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@ -9,7 +9,26 @@ Luau is our new language that you can read more about at [https://roblox.github.
## Typed variadics
[TODO]
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!
```
function f(x: string, ...: number)
print(x)
print(...)
end
f("hi")
f("lo", 5, 27)
```
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`"
Variadics can be used in function declarations, and function types, for example
```
type T = {
sum: (...number) -> number
}
function f(x: T)
print(x.sum(1, 2, 3))
end
```
## Generic functions
@ -39,5 +58,6 @@ Luau now has a shiny new logo!
## Coming soon...
* Better treatment of cyclic requires
* Generic variadics!
* Better treatment of cyclic requires!
* [Anything else?]