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Postings from January 2003
Re: More Array Behaviors
From:
John Williams
Date:
January 27, 2003 14:38
Subject:
Re: More Array Behaviors
Message ID:
Pine.LNX.4.33.0301271231400.26403-100000@sharkey.morinda.com
On Mon, 27 Jan 2003, Michael Lazzaro wrote:
> Some requests for verification, plus additional questions. If anyone
> has any arguments/clarifications/questions on these, please discuss so
> I can document.
>
> 1) Edge cases in array indexing:
>
> @a[ undef ] # undef, or 1?
> @a['foo'] # undef, or 1?
These should generate warnings, at least.
I don't know whether undef or 1 is more correct.
Perl5 chooses 1, but it's smart enough to distiguish between $a["1e0"]
(returns 2) and $a["1e"] (returns 1 and a non-numeric warning), so it's
definitely choosing to return $a[0] for non-numeric indexes.
(0+"1e" is 1, not 0)
> Is [undef] the same as [0] in Perl6? Is there any index value you can
> give that will cause an exception?
What about @a[NaN]? Just another warning probably.
~ John Williams