RE: local by default
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- Subject: RE: local by default
- From: "Jerome Vuarand" <jerome.vuarand@...>
- Date: 2007年1月12日 14:55:50 -0500
David Given wrote:
> Matt Campbell wrote:
> [...]
> > What is the position of the Lua team on making variables local by
> > default when they are assigned within a function without being
> > explicitly declared? Is the team considering this change
> for a future
> > version of Lua, or will the "local" keyword always be
> required? Also,
> > are any local-by-default patches available for Lua 5.x? Thanks.
>
> This shows up periodically on the list. I am not a member of
> the team, but I believe the general consensus is that it's
> not a good idea, because:
>
> function increment_i()
> i = i + 1 -- this doesn't do what you expect
> end
>
> But if you want the full discussion, I'd suggest checking out
> the list archives.
There has been a few good explanations in that topic iirc (check
preceding and following posts, that one has some particularly
interesting quotes):
http://lua-users.org/lists/lua-l/2006-09/msg00103.html
I remember that the conclusion was something like: global by default is
bad, local by default is much worse.