Re: Undefined variables returning nil
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- Subject: Re: Undefined variables returning nil
- From: TNHarris <telliamed@...>
- Date: 2013年3月20日 16:05:45 -0400
On Wednesday, March 20, 2013 03:21:10 AM Coda Highland wrote:
> Points 2 and 3 here could be addressed by having separate values for
> "undefined" and "no value". That much, at least, is relatively
> irrelevant. If such a feature were to be added to Lua, the only
> difference is that the automatic fallback would return "undefined"
> instead of nil, but omitted parameters and explicit nils would still
> be nil.
No, because function parameters and variable assignment are the same thing.
a,b,c = 1,nil -- 1,nil,undefined
a,b,c = (function() return 1,nil end)() -- ditto
(function(a,b,c)
-- 1,nil,???
end)(1,nil)
(function(...)
a,b,c = ... -- 1,nil,???
end)(1,nil)
I look at the issue as job security. If bugs were obvious and easy to find,
that would really cut into my billable hours.
--
tom <telliamed@whoopdedo.org>