Re: NIL in arith. and string op.

[Luis Carvalho <carvalho@...>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

> Is it possible - if nil used in arithmetic or
> string (concat.) operations set it's value
> to 0 or empty string, not raising error?
> 
> Eg., 10 + nil == 10; "ab"..nil.."c" == "abc"

I think it is, but why? A simpler solution is:

a = 2 + (nil or 0) + 5		-- a = 7
c = "Merry " .. (nil or "") .. "Christmas!"

Cheers,
Luis.

- -- 
Mathematicians practice absolute freedom.
                -- Henry Adams

- -- 
Luis Carvalho
Applied Math PhD Student
Brown University
carvalho at dam dot brown dot edu

PGP Key: E820854A <carvalho@dam.brown.edu>
Available at: http://www.dam.brown.edu/people/carvalho/pgp-key

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.2.1 (GNU/Linux)

iD8DBQE/6u9Z1zi/pugghUoRAikQAKCcj3KWkSXt0I21o2QghlceP6ISUwCg5duE
kE5jKKIrJmB9ioTsKish8lw=
=aZhb
-----END PGP SIGNATURE-----