-- Pure Lua:
hello = 2
-- Roblox Lua:
hello = 2
_G.hello = 2
getgenv().hello = 2

--Getfenv used the make normal variables into a global variable
myVariable = "Hello, environments" -- Note: a global variable (non-local)
local env = getfenv()
print(env["myVariable"]) --> Hello, environments

varname = varval

--[[
Global variables don't need a declaration like "local." Instead, you'd just
write like this:
]]--
variable = --value
--[[
Note, you don't always have to even assign a value to a variable. You can
use it for the first time and get a value of "nil" which you can update later.
]]--

-- roblox luau:
_G.getPlayer = function() print(game.Players.LocalPlayer)
end
_G.getPlayer()
-- <username>