Re: _ENV vs _G
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- Subject: Re: _ENV vs _G
- From: Tom N Harris <telliamed@...>
- Date: 2014年8月12日 06:51:20 -0400
On Tuesday, August 12, 2014 09:16:59 AM Dirk Laurie wrote:
> 2014年08月12日 8:51 GMT+02:00 Mason Mackaman <masondeanm@aol.com>:
> > Also, so far it seems like _G is the equivalent Lua 5.2’s appendix.
>
> Maybe, for the sake of conceptual integrity, it could be deprecated
> in Lua 5.3.
I think it still has a place.
local _ENV = setmetatable({}, {__index=_ENV})
function print(...)
_G.print("my print:", ...)
end
There are three general scopes that most sensible programs will concern
themselves with: local, file (or module or class), and global. The first has
the `local' keyword, the second has the _ENV upvalue, and the last has _G.
--
tom <telliamed@whoopdedo.org>