u/DotGlobal8483

your*

Only know of these ways but kinda curious if there's more

Proceedural(?)

function make\_vector(x,y)
  return {
    x = x or 0,
    y = y or x or 0
  }
end

function print\_vector(vector)
  print( "X: ".. vector.x .. " Y: " .. vector.y)
end

local pos1 = make\_vector(10,15)
print\_vector(pos1)
pos1.x = 0
print\_vector(pos1)

No metatables

local Vector = {}

function Vector.new(x,y)
  local self = {}

  self.x = x or 0
  self.y = y or self.x

  function self.print()
    print("X: " .. self.x .. " Y: " .. self.y)
  end

  return self
end

local pos1 = Vector.new(10,15)
pos1.print()
pos1.x = 0
pos1.print()

metatables

local Vector = {}
Vector.__index = Vector

function Vector.new(x,y)
  local self = setmetatable({},Vector)

  self.x = x or 0
  self.y = y or self.x

  return self
end

function Vector:print()
  print("X: " .. self.x .. " Y: " .. self.y)
end

local pos1 = Vector.new(10,15)
pos1:print()
pos1.x = 0
pos1:print()