Re: why not ++ in lua?

[Andreas Stenius <kaos@...>]

Rici Lake wrote:
[...]

> An intermediate proposal with simpler semantics (although its arguably a 
> lot uglier) is to allow pseudovariables of the form $<integer> to appear 
> in assignment statements; $<i> refers to the rvalue corresponding to the 
> i'th lvalue, and, for convenience, the <integer> defaults to the current 
> position in the expression list. This would allow things like:
>
>   a[i] =$+ 1  -- increment a[i], or whatever a's metamethods make of it.
>   a[i], a[j] = $2, $1 -- swap a[i] and a[j]
>
> [...] so it might 
> satisfy the need. The second example could be handy if i and j were 
> actually expressions.

I like this. What I would like to see is to not have to type the var name
twice in the assignment (especially those with quite long names, maybe even
in tables, with a long key var too..), which this solves quite neatly, IMO.

Feels like it shouldn't be too hard to achieve either :)

//Andreas