How to make an object within a Module Script?
So I want to make an object that can be created in multiple scripts, so I went with this approach:
Module Script Example:
local module = {}
Object = {}
function module:constructObject(x, y)
return setmetatable({x = x, y = y}, Object)
end
Object.__index = Object
function Object:getX()
return self.x
end
function Object:getY()
return self.y
end
return module
Now if I were to construct the object in another script written in the module above and call one of its methods, it would be considered to be nil. Is there a way around having to write object methods that are considered to be nil when called from a script that requires from the module?
1 answer
Your wording is a bit confusing, but hopefully this will help. The way that I create object oriented style classes in Lua is with the closure-based objects described at the bottom of this page: http://lua-users.org/wiki/ObjectOrientationTutorial
Doing it this way, you can write your module script like so:
local MyModule = {}
function MyModule.new(x, y)
local self = {}
-- Local variables are private to your class
local x = x
local y = y
-- Public variables can be created like this
self.thisIsPublic = "Hello World"
-- A private function
local function CombineString(str)
return str .. "!!"
end
-- A public function
function self.PrintStuff()
print(CombineString(self.thisIsPublic), x, y)
end
return self
end
return MyModule
Then in another script somewhere:
local MyModule = require(game.ServerStorage.MyModule) local m1 = MyModule.new(4, 5) print(m1.thisIsPublic) m1.PrintStuff() -- Notice the . syntax, not : local m2 = MyModule.new(1, 3) m2.PrintStuff() m1.PrintStuff()
Which outputs:
Hello World
Hello World!! 4 5
Hello World!! 1 3
Hello World!! 4 5
So you can see that every object you create this way is a seperate instance. I hope this helped.
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