Help me understand something?

Help and Feedback Scripting Support
, ,
#1

Hi reader,

recently i found out you can set typs of variables and make your own types aswell.
I typed over another ones code but just the part i want to understand.

The script

export type Person = {
	__index: Person,
	
	Name: string,
	Age: number,
	Object: Instance,
	
	new: () -> (Person),
	setName: (self: Person) -> ()
}

local personClass: Person = {} :: Person
personClass.__index = personClass

function personClass.new()
	local self: Person = {} :: Person
	
	self.Name = "Person"
	self.Age = 18
	self.Object = Instance.new("Model")
	
	return setmetatable(self :: any, personClass)
end

function personClass:setName (name)
	self.Name = name
	
	return self
end

local person1 = personClass.new()
local person2 = personClass.new()

warn(person1, person2)

person1:setName("Another name")

warn(person1, person2)

it all works and does what you expect but i have some questions like:

What is the first and second () for?

setName: (self: Person) -> ()

What does :: do?

And what are other possiblities by coding like this?