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Re: not 4,3,2,1,0;
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From:
Larry Wall
Date:
May 16, 2005 12:49
Subject:
Re: not 4,3,2,1,0;
Message ID:
20050516194913.GA9688@wall.org
On Tue, May 17, 2005 at 01:48:20AM +0800, Autrijus Tang wrote:
: This evaluates to 1 in Perl 5:
:
: not 4,3,2,1,0;
:
: Namely, the "not" listOp is taking the last of a variadic, non-slurpy
: argument list, boolify it, and return its negation.
:
: What is the Perl 6 signature that correspond to this behaviour?
There is none. Wherever Perl 5 defaults to "last of list", Perl
6 doesn't. If you wanted to emulate it in user code, you'd have "is context(Scalar)" or some such and then explicitly ignore all
but the last value in your implementation. But no built-ins rely on
C-comma behavior.
: Also, is this still sane for Perl 6's ¬?
No. In list context it should do !«[4,3,2,1,0]. In scalar context it
should probably return something like !any(4,3,2,1,0) or none(4,3,2,1,0)
or whatever we decide makes our collective brain hurt the least.
Larry
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