What does this even do

[cardboardthethird (unfun)]

self explanitory really

whats the point of this notation
why do people do it
what makes it useful

thing:() -> ()

???
help

[Sqowly (jellytarzan)]

A function that returns a function?

[EffBeeCee]

That is a type. Specifically, a type for a function that takes zero inputs and creates zero outputs.

Read more about it here:

Type checking

---

The full code would most likely be:

type thing = () -> ()

Or (this would be in a module; the type would be used in another script):

export type thing = () -> ()

---

For an average person, you generally wouldn’t need to define the type like this since it is very simple. In most cases, you could just do:

local function thing(): ()
	
end

Or generally:

local function Function(input: InputType): (outputs: OutputType)
	
end

-- This is the equivalent to:

type FunctionType = (InputType) -> (OutputType)

local Function: FunctionType = function()

end

---

There’s some more info I could talk about, but it would probably be best if you learn the basics of type checking first, since it isn’t a super easy topic.

Sorry for so many edits.