lua - Setting __index of current environment in Roblox -


in roblox studio, have modulescript object implements analogous class 1 shown in chapter 16 of 1st edition of programming in lua, shown below:

local h4x0r = { }  local function setcurrentenvironment( t, env )     if ( not getmetatable( t ) )          setmetatable( t, { __index = getfenv( 0 ) } )     end      setfenv( 0, t ) end      setcurrentenvironment( h4x0r );              h4x0r.account = { };         setcurrentenvironment( h4x0r.account );         __index = h4x0r.account;          function withdraw( self, v )             self.balance = self.balance - v;             return self.balance;         end          function deposit( self, v )             self.balance = self.balance + v;             return self.balance;         end          function new( )             return setmetatable( { balance = 0 }, h4x0r.account )         end          setcurrentenvironment( h4x0r );     end end  return h4x0r

i attempted use following script access account class, assuming of members of 2nd do-end block assigned h4x0r.account:

h4x0r = require( game.workspace.h4x0r ); account = h4x0r.account;  account = account.new( ); print( account:withdraw( 100 ) );

the above script fails error workspace.script:5: attempt call method 'withdraw' (a nil value), must issue regarding line set __index field of h4x0r.account.

can please explain me went wrong?

try using getfenv(2) , setfenv(2, t) instead of getfenv(0) , setfenv(0, t). want change environment of encapsulating function, stack level 2.

0 special argument instead or set environment of thread, used default environment in cases, not affect individual closures have been instantiated in thread, hence doesn't work in case.


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