How to declare a variable as a function

[Adi_DK (Adi)]

In Lua you can declare what datatype a variable is, for example

local myNumber: number = 2

and

local myString: string = "hello"

but how would you declare a variable as a function?

local myFunction: function = function()
    -- This isn't how it's used in my actual code, just a simplified example
end

I’ve been looking around for a while and haven’t been able to find anything, I thought asking here would be a good idea.

[athar_adv (athar_adventure)]

Just make a seperate function and declare a new variable that uses it.

local function MyFunction()
-- code
local myVariable = 1 -- example
return myVariable
end

local myVariable
myVariable = MyFunction()
print(tostring(myVariable)) -- prints 1

[athar_adv (athar_adventure)]

If this isn’t what youre looking for, I’m curious as to what you mean by “a variable that is a function”, because

local function

Already makes a name/variable for the function. just with () at the end to signify its a function

[Adi_DK (Adi)]

That wouldn’t really work in my case since the function is defined in a seperate module

This is my current code:

local Container = require(script.Container)

for cIndex, category in Container.Data do
	for sIndex, setting: {Name: string, Type: string, Min: number, Max: number, Function: } in category do
		if setting.Type == "NumberInput" then
			local frame = script.NumberInput:Clone()
			
			frame.TextBox.Changed:Connect(setting.Function)
		end
	end
end

[athar_adv (athar_adventure)]

Forgive me if i’m wrong, because I seldom work with module scripts, but couldn’t you just do Container:MyFunction() instead of declaring the function as a variable?

[wf_sh (wait)]

Functions can be typed in the format () -> () where the first parenthesis is the parameter types and the second is the return types.

e.g a function that takes a number and returns a number has type (number) -> (number)

local double: (number) -> (number) = function(n)
	return n * 2
end

The parameter types can also have a name associated to them
(parameter1: type, parameter2: type) -> (type)

[athar_adv (athar_adventure)]

Ah yes I forgot about the arrow thing

[Adi_DK (Adi)]

oh thank you so much! this was exactly what I’ve been looking for!