Re: Is it safe to unpack { nil, a, b } ?
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- Subject: Re: Is it safe to unpack { nil, a, b } ?
- From: "Pierre Chapuis" <catwell@...>
- Date: Mon, 2 Nov 2015 08:35:02 +0100
> Officially, it's not correct to do "table.unpack{nil, 'something',
> 'another'}" because the nil makes it legitimate for table.unpack() to
> regard the length of the table as 0.
>
> However, all Lua implementations I've checked (Lua 5.1, 5.2, 5.3, JIT)
> do calculate #{nil,a,b} to be 2, not 0. Let's assuming a and b are
> never nil.
>
> So I was wondering if this is a special case we can trust to always work.
Depends on what you call "safe", but remember:
> t = {nil, 2, 3}
> #t
3
> t={}
> t[2] = 2
> t[3] = 3
> #t
0
--
Pierre Chapuis