LÖVE

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-- other.lua
local m = {}
m.a = 1
m.b = function(x) return x end
return m

-- main.lua
local h = require "other"
print(h.b(h.a))

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function love.load()
	State={}--This is my main state. It holds my lua states
	require('menu')
	State=menu--this time, when I start my aplication, it will load my menu
end
function love.update(dt)
	dt=love.timer.getDelta()
	checkState=State:isDead()--true if its Dead. If a state is "dead" then I'll get back to the menu
	pass=State:isPassed()--true if its Passed. If a state is "passed" then I'll be redirected to the next state
	name=State:getID()--true if... no! that's a String. it'll help me know inside which state I am and to what I'll go
	if checkState then
		if name~="menu" then
			require('menu')
			State=menu
			State:init()
		end--returning to menu if the state "die"
		if name=="menu" then
			require('stage1')
			State=stage1
			State:init()
		end--going to first state
	end
	if name=="stage1" then
		if pass then
			require('stage2')
			State=stage2
			State:init()
		end
	end--going to next state
end
	State:update(dt)--updating the current state
	collectgarbage()
end

function love.draw()
	State:draw()drawing whatever you need to draw
end

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--set up for levels
local title   = require 'assets.levels.title'
local level01 = require 'assets.levels.level01'

--variable for adjusting physics values for movement speed and jumping
physicsMultiplier = 1000

--table for all player related stats
playerStats = {
                health       = 3,
                score        = 0,
                invul        = 0,
                weaponEquip  = 0}

--variable for level selection
levelSelector = 0

function love.load()
  if levelSelector == 1 then loadLevel_01() end
end



function love.update(dt)
  
  if levelSelector == 1 then
    updateLevel_01(dt)
  else
    updateTitle(dt)
  end

end

function love.draw(dt)
  
  if levelSelector == 1 then
  drawLevel_01()
  else
  drawTitle()
end

end

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if levelSelector == 1 then
...
else if levelSelector == 2 then
...
else if levelSelector == 3 then
...
else if levelSelector == 4 then
...
end

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level01 = {}
function level01.draw() -- instead of level01_draw
...
end
function level01.update(dt)
...
end

level02 = {}
function level02.draw()
end
function level02.update(dt)
  if levelExit:touchesPlayer() then -- for example
    currentlevel = level03
  end
end


function love.load()
  currentlevel = level01
  currentlevel.load()
end

function love.draw()
  currentlevel.draw()
end

function love.update(dt)
  currentlevel.update(dt)
end

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level01 = require "level1"
level02 = require "level2"
level03 = require "level3"

local current_level = level01

function love.draw()
  current_level.draw()
end

function love.update(dt)
  current_level.update(dt)
end

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local level = {}
function level.update(dt)
 ...
end
function level.draw()
...
end