On Wed, Mar 27, 2013 at 10:48 PM, Shane Green <shane@umbrellacode.com> wrote:
That's clever: even works for zero because it's returned by or as second false.  Cool.  So I suppose I have to come up with more examples now ;-)  

Actually, on that point, I actually think the seen.added(value)  (with a better name) is quite a bit cleaner than the one using "or".   Clever as it is, I think someone learning the language would flinch when they saw that… :-)

Yes, I suppose it's a bit obscure but you're only going to use it in a case where you value brevity over clarity, right?
The C comma operator which always returns the second value, not depending that the first value is false. You can write this in Python as:

    (foo, bar)[1]

or is there some cleaner way to write that?

    #define comma  and False or
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