Luau Recap: March 2021

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Luau open source confirmed?

To be honest, an open-source version of Luau would be amazing. I already love the language and bringing it to a non-Roblox environment is useful for developers like me who also like to write backend code that works with Roblox APIs. Soon all my Roblox stuff can be done in a single language.

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Honestly, that new logo could use some work. I’m not getting any Roblox vibes from it. There’s no gradient or box in the middle. :slightly_frowning_face:

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Was the U supposed to be lowercased? But yeah It looks good lol!

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ROBLOX IS LISTENING!

What will these “better tools” look like, and when can we expect to see these released. Since i think many of us on the forums have expressed our concern about the current tools for memory analysis on roblox will this finally quench our thirst?

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The u is intended to be lowercased since Luau is meant to be pronounced the same way as the Hawaiian lūʻau (also spelled luau) AFAIK.

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thanks for the PascalCas’ed :grinning: :grinning:

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Nice.

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:grimacing: Time to switch all instances of table[#table+1]=value in my code to use table.insert now
Nevertheless, this is a nice change and will definitely make it easier to write easy-to-read code while still maintaining performance!

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Time to update some code! This is great, especially when dealing with large arrays of data.

It’s great to keep seeing improvements being squeezed out built-ins, can’t wait to see what’s in store for the future.

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Luau looks really confusing on these screenshots
will old games break because of this script update?

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Luau is additive: It only adds additional features to the language. Your normal Lua code will continue to work like it did before if you choose not to use the additional Luau features.

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How can I use type-checking? I don’t see any changes when running code.

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Here is what I think the Luau logo should be:

image

So it looks more similar to the Studio logo

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The Luau Type Checker doesn’t change anything when running the code, it’s a script editor system. It does enhance performance however.

--!strict
local function add(a: number, b: number) : number
   return a + b
end

add("hey", 5) -- warning
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Oh ok, I thought it would change something when running code as well, thanks for telling me!

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You mean


? >:D

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I tried using generic functions and typed variadics, but this seems to generate a warning? It looks like it should work, since it returns all values and T... should be (number,number).

--!strict
local function f<T...>(...:T...):T...
	return ...
end
local a,b = f(1,2)
-- W000: (5,1) Function only returns 0 values. 2 are required here

This also doesn’t seem to work.

--!strict
local function f<T...>(...:T...):...any
	return ...
end
-- W000: (3,2) Failed to unify variadic packs

Shouldn’t everything be ok for ...any (any amount of values with any types)?

Am I doing something wrong in these examples, or are these bugs?

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You are trying to use generic variadics that aren’t quite ready. The syntax you use means “T… refers to a tuple of types that don’t have to be the same”. Some bugs in this area will be fixed in the coming weeks with a proper announcement next month, as well as better error messages.

You can, however, do this today:

local function f<T>(...:T): ...T
	return ...
end

Which means that f() takes any number of values of the same type and returns all of them.

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Finally! All the code I’ve written using table.insert(t, v) is no longer inferior!

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