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Re^3: Perl oddities

by merlyn (Sage)
on Mar 01, 2005 at 18:24 UTC ( #435557=note: print w/ replies, xml ) Need Help??

in reply to Re^2: Perl oddities
in thread Perl oddities

There's no promise in the docs that less than and greater than return 1 and 0. Just "true" and "false". It could return 37 for true, and undef for false.

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

Comment on Re^3: Perl oddities
Re^4: Perl oddities
by Roy Johnson (Monsignor) on Mar 01, 2005 at 18:46 UTC
    As someone who has just posted a couple of times about undocumented behavior, I will not protest too loudly about being called on this one. Still, it's a convention that has been relied on and seems unlikely to change.

    The obvious fix is:

    sub ceil { my $n = shift; int($n) + ($n > int($n) ? 1 : 0); }

    Caution: Contents may have been coded under pressure.
Re^4: Perl oddities
by TimToady (Parson) on Mar 01, 2005 at 19:02 UTC
    We will try to nail those down a little better in Perl 6. Returning the null string for false was a premature optimization on my part, and a false economy (as it were), so the standard boolean operators will return 0 and 1 in Perl 6 so that when you print them out, they look like something rather than nothing. Also, since Perl 6 distinguishes boolean from numeric and string contexts, it can optimize away the actual production of a 0 or 1 value in many cases.

    That's not to say that we're ever going to require people to use 0 and 1 for boolean values. Perl 6 will be just like Perl 5 in letting you treat just about anything as a boolean value. So non-zero numbers are still true, as are strings that aren't null or "0". And maybe we can fix the "0" problem too.

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