Re: Slices (Was: Holes)

[Axel Kittenberger <axkibe@...>]

And when we are it, instead of using "end" lets use indentation as
block indicator.
Table keys are the greatest thing about Lua ever.

On Wed, Dec 15, 2010 at 9:47 PM, Dirk Laurie <dpl@sun.ac.za> wrote:
> On Wed, Dec 15, 2010 at 06:56:12AM +0200, David Manura wrote:
>> you'd probably prefer it in the
>> form of slices instead: `t[3:6] = ...` (i.e. replace elements 3
>> through 6 with the elements in the vararg list).
>
> Two extensions to Lua needed:
>    3:6             --> {3,4,5,6}
>    a[{3,4,5,6}]    --> {a[3],a[4],a[5],a[6]}
> Will this break many programs?  I doubt it: table-valued keys
> are close to useless.
>> a[{1,2}]='s'
>> print(a[{1,2}])
> nil
> At present a table-valued key hashes the address of the table.
> You can't use it, as I tried above, to simulate double indexing.
>
> The lexical analyzer will have to handle str:find(...) as a call
> to an overloaded function __colon(str,find)(..) (or whatever)
> instead of as syntactic sugar.  May be hard to do.
>
> Dirk
>
>