Luau Type Checking - Roblox Scripting Tutorial

[@dad8102]

Can you make a video about custom state machines, how to make a simple one and how you can use it for both players and npc I think it would be very useful for beginners.

[@Guwd208]

I second this, would be great

[@Glitchey]

I hope he made video about this.

[@Glitchey]

Hello there Suphi, can you make a tutorial about "Behaviour Tree" and implimentaions in NPC AI?

[@emotionallydeprived1889]

Agreed

[@Marcus001]

This is an awesome feature

[@PipsJacob]

can you make a noob to pro scripting series sir

[@BugerGFX]

Hey! can you make like a noob to pro scripting tutorial with each episode you teach something new

[@JPEGArtifact]

Type chicken 🤤

[@KLevn_]

huh, i thought i did everything on typechecking. I've learned something new today. Can you please make video about Generics for the follow up? i've read the docs and i dont know what it does.

[@sin_2]

dont forget to like the video

[@GamingMasterMind3000]

I would love it if you made a gun video that covered pistol type guns and automatic guns (and possibly shotguns that spreadshot).

[@METOPv2]

I just was thinking today "Ohh when Suphi will make video about type checkin"

[@aarongamerph]

Thank you! I never knew about this and often get confused on why there's Colons on function variables but now I know, and I will now be starting using it on my scripts, thank you!

[@MMMasterLego]

this will definitely be useful in my next project thanks for all the great video's

[@ZeroWZM]

Ik you most likely won’t see this but would you ever make or consider making a beginner scripting series

[@5uphi]

Have you watched this video? kzbin.info/www/bejne/o4uwpoqhmJWWj8k it's a good one for beginners hopefully I'll have more videos for beginners in the future

[@ZeroWZM]

@@5uphi thank you I’ll be sure to check it out I was looking through you’re page and was confused on where to start 😂

[@5uphi]

Other than the snake video my other videos are not designed for beginners hopefully I'll have more beginner friendly videos in the future and I'll put them all in a playlist

[@slyers04]

Could you explain generic types and generic functions? The Luau docs don't explain it in a way I can understand

[@il1ekp1e4]

haha nope Slyers!

[@Anobot]

This is a pretty helpful tip when working on module scripts

[@guestboy342]

Thanks for doing my suggestion! Or you coincidentally thought of this idea after I wrote my comment on your last video, it wasn't very clear. Anyways, I've understood it after this video! I have another suggestion for a video. It could be about string.format() or the string library and again, some use-cases of using them.

[@Kitsune_Dev]

Can you do a video on how to use VSCode and Rojo

[@Testbot379]

Basically is it like Statically typed language like C++?

[@CloverKismet]

Super epic, thanks!

[@akram-qn6my]

Keep going bro

[@DimoDimoo]

Question: what are good scenarios to use type checking and what are some bad scenarios?

[@5uphi]

It's personal preference it would be like asking what are some good scenarios when to add ketchup to your food

[@shreddedOrphans]

hey I understand that is it functionally the exact same but in the documentation for module scripts it says to put them inside of serverScriptService. I just thought u might want to know!!

[@PluffPenguin]

Thank you! This was very helpful. Is there a way to do type-checking with metatables? Specifically the self variables. I tried doing something like self.name : string = "Template", but with no luck.

[@5uphi]

You can do module.Func = function(self : myType) end You can also cast the type by doing self :: myType Or you can move self into a different variable local object : myType = self

[@cgl4de]

You could create custom types using the `type` keyword. Example: `type myCustomType = {Name: string, value: any}` and then type cast `self` to the type; local self = setmetatable(myTable, myMetaTable) :: myCustomType;

[@uliveulearnandregret]

@@5uphi thanks with this knowledge I made an object creator/editor no ui for it yet

[@marinavandelft3072]

Can you do a tutorial of how to script like a realm unlock GUI like in a Find the game? If you don't know what I mean, look at like Find the Chomiks realm unlock, or Find the Toasties realm unlock. Please, make a tutorial about this. It's been driving me crazy knowing how to do this!

[@ultrio325]

There are a lot of instances where I've gone "No, I don't care that you can't see metafunctions, the code works fine and you're gonna shut up" and put a --!nocheck up front

[@Smurfis]

How I don’t use the feature of multiple screens because I use a laptop is beyond me.

[@jam5936]

Essentially type checkikg makes the code more readable and easier to understand?

[@5uphi]

Some might say it makes it less readable but essentially its to give you a warning if you use the incorrect type

[@jam5936]

Seems worth it to me @@5uphi

[@ПокровскийМихаил-е9ц]

give tutorial for procedural animation

[@5uphi]

Have you watched this video kzbin.info/www/bejne/bpe5XouFhM9phZY

[@costo.]

What about (type) -> ()?

[@5uphi]

() -> () is a function type and a (number) -> () is a function that has a number parameter and () -> number is a function that returns a number

[@payh1591]

You should consider creating a udemy course

[@Xarphine]

You make really great videos for roblox developers I think your channel deserves way more than 10k subs!

[@74L]

Another amazing video by our favorite dev youtuber

[@codes8300]

Finally! Been waiting for this moment!

[@uliveulearnandregret]

this is a great video however I tried to do this with more functions inside the tables along with using self, I made a metatable, the first type is always string or whatever I set it as and the types after are always any...

[@manuedz]

this was so convenient. i was literally trying to learn how to use modules organised and this video pop out amazing

[@hdbsbejfbbf1864]

How can I implement this with oop, I couldn’t figure out how to have self with autocomplete

[@5uphi]

You can do module.Func = function(self : myType) end You can also cast the type by doing self :: myType Or you can move self into a different variable local object : myType = self

[@kif-zallrhat1870]

I know about this but I have absolutely no idea what to use it for. I always set my variable names in a way I know what their type, and I tend to remember how my codes work. Perhaps it will be handy for team creates and publishing open source code.

[@execute214]

when you need help from other people, seeing a return type of a function, looking at your own code in the future etc

[@goreacraft]

at 13:00 can "vector3.X = x :: number" be a valid solution?

[@5uphi]

no x is already considered as a number so doing that has zero effect

[@username-l7e]

Type chicken lol

[@ExePlr3270]

Gracias por enseñarnos algo nuevo.

[@kroomyw]

didn't type checking affected the game before?

[@5uphi]

no

[@jaszczurka5069]

so this doesn't do better for performance, right?

[@5uphi]

At this current time has no effect in game

[@UsuallyMurdering]

I'm trying to make a question type game and I'm want to use the same buttons and script for each questions. When I add multiple functions in one script they all run at the same time, was wondering if there was a way to stop one function then use another in the same script. If not, do I just have to make multiple scripts and run them?

[@vermilion4215]

I think what you need is coroutines

[@uliveulearnandregret]

for me I use task.wait() and I use boolean values you can use it to flip flop through your questions one at a time, I'll give you an example I made a button that teleports me vertically the same way back and forth 500 studs each, but when I press that button I don't move anywhere why? because I was teleported twice in less than a second, that's the same problem you are having, I made a boolean value set itself to false or true when I press the button, we still get the same issue, so we instead have to add a task.wait() right above where we change the value to true or false, you get it?

[@aze2795]

todays tutorial was really helpful, thanks!

[@5uphi]

Glad it was helpful!

[@Sand.]

oh this sounds cool

[@ritsu9837]

First

[@Xanthodion]

Luau!

[@m_r5723]

i got a question. What does the double colon symbol mean in coding, as i've seen it alot in modules that deal with exports and typechecking, typically somewhere in the end of the module placed a :: Also very compherensive and easy to understand tutorial organized into a short video, thanks!

[@tower9602]

:: is mostly comes from C++, from what I know luau does not have any non string purpose of ::

[@5uphi]

It's to cast a type onto something So doing variable :: number indicates the variable is a number

[@tower9602]

@@5uphi I think you have to use one : instead of two, correct me if I'm wrong

[@5uphi]

You use 1 when setting the variable to a type but use 2 to cast the variable something like this local function Func(x : number) return x :: string end

[@tower9602]

@@5uphi oh so it's more of telling what function will return as a result, ok thanks

[@miffclick3358]

Good for working with other people. But nothing fir optimization