LÖVE

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-- Class Pointer --
function conNewPointer()
  local Pointer = {}

  -- Variables --
  Pointer.x = 0
  Pointer.y = 0

  function Pointer:update(dt)
    -- Original update --
    self.x = self.x + 1
    -- Compensating for not being able to keep old properties --
    self:abstractUpdate(dt)
  end
  
  -- Too complex abstract function to try to compensate. --
  function Pointer:abstractUpdate(dt)
    
  end

  return Pointer
end

-- Class Dimension --
function conNewDimension()
  local Dimension = conNewPointer()
  
  -- Using this function to compensate for not being able to keep old commands of previous function,
  -- when calling Dimension:update(dt) --
  function Dimension:abstractUpdate(dt)
    -- Inconvinient solution. --
    self.y = self.y + 1
  end
  
  return Dimension
end

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-- Class Pointer --
function conNewPointer()
  local Pointer = {}

  -- Variables --
  Pointer.x = 0
  Pointer.y = 0
  
  function Pointer:abstractUpdate(dt)
  end
  
  function Pointer:update(dt)
    Pointer.x = Pointer.x + 1
    Pointer:abstractUpdate(dt)
  end

  return Pointer
end

-- Class Dimension --
function conNewDimension()
  local Dimension = conNewPointer()
  
  function Dimension:abstractUpdate(dt)
    Dimension.y = Dimension.y + 1
  end
  
  return Dimension
end

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-- I don't know when to use periods
function SampleClass.update(dt) end
-- and when to use colons
function SampleClass:update(dt) end

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-- I ALWAYS do this
SampleClass.x = SampleClass.x + whatever
-- Because I never know when to use this
self.x = self.x + whatever

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-- Class Pointer --
function conNewPointer()
  local Pointer = {}

  -- Variables --
  Pointer.x = 0
  Pointer.y = 0
  
  function Pointer:update(dt)
    Pointer.x = Pointer.x + 1
  end

  return Pointer
end

-- Class Dimension --
function conNewDimension()
  local Dimension = conNewPointer()
  
  function Dimension:update(dt)
    Dimension.x = Dimension.x + 1
    Dimension.y = Dimension.y + 1
  end
  
  return Dimension
end

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-- Class Point --
local Point = {}
Point.__index = Point

function Point:update(dt)
	-- Point's update
	self.x = self.x + 1
end

function newPoint()
	local p = {
		x = 0
	}

	setmetatable(p, Point)

	return p
end



-- Class Line --
local Line = {}
Line.__index = Line

-- Note: If you want Line instances to fall back to point methods automatically if Line doesn't have them, then you'd need to do something like this instead:
--[[
local Line = {}
local mtLine = {__index = Point}
Line.__index = mtLine
setmetatable(Line, mtLine)
--]]

function Line:update(dt)
	Point.update(self) -- Calls other "Class"'s update function containing only the x param updater.
	-- Line's update
	self.y = self.y + 1
end

function newLine()
	local l = newPoint()

	-- Add second dimension field
	l.y = 0

	-- Fix the metatable so it's a line instead of a point.
	setmetatable(l, Line)

	return line
end