Re: [Challenge] Smallest table copy

[Philipp Janda <siffiejoe@...>]

Am 08.05.2014 20:11 schröbte Pierre-Yves Gérardy:
> On Thu, May 8, 2014 at 5:35 PM, Philipp Janda <siffiejoe@gmx.net> wrote:
> > Am 08.05.2014 17:24 schröbte Pierre-Yves Gérardy:
> > > L="local a,b,c=..."load(L.."")load(L.."")
> > > function(a,b,c)endfunction(a,b)end
> >
> >
> > Yes, and we also rely on upvalues, so we would need the `function` keyword
> > in there after all ...
> > But for a moment it was a good idea.
>
> No need for upvalues, a Lua chunck really is a vararg function:
>
>      add = load"local a,b = ... return a + b"
>      add(1,2) --> 3

If you want to use the `type` (or `next`) function in there without 
passing it in every call, then you need them as upvalues. E.g.:

    add = load[[
      local t = ...
      return function( a, b )
        if t( a ) == t( b ) then
          return a + b
        end
      end]]( type )

Personally, I usually don't localize all globals in toy programs, but 
the OP seems to care. Better safe than sorry, I guess.

> —Pierre-Yves

Philipp