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- Subject: Re: Lexical environments
- From: Luiz Henrique de Figueiredo <lhf@...>
- Date: Tue, 2 Feb 2010 21:14:48 -0200
> I have always found Peter Shook's "Unpack Tables by Name" patch
> very convenient with Lua 5.1. You could simply write
> local x,y,z in t
> in place of
> local x,y,z = t.x,t.y,t.z
> In Lua 5.2 the syntax of Shook's patch would appear to clash
> with that for lexical environments, because after "local x,y,z in t"
> the keyword "do" is expected. Does anybody have any suggestions
> for a resolving this clash. Shook's patch is for reading values
> from a table without having to keep repeating the table expression,
> whereas lexical environments are for writing to a table without
> having to keep repeating the table expression. It would be more
> be more balanced if both could be done.
Lexical environments can be used for reading as well. The code below
does the equivalent of "local x,y,z in t":
in t do
local x,y,z = x,y,z
There's still a repetition but it's like that already in 5.1.