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Perl: the Markov chain saw

Re^2: $# -variable?

by GrandFather (Saint)
on Jul 27, 2006 at 09:15 UTC ( #563996=note: print w/replies, xml ) Need Help??

in reply to Re: $# -variable?
in thread $# -variable?

Umm, not quite. Consider:

use warnings; use strict; $[ = 2; my @array = ('a', 'b', 'c'); print "$#array\n"; $[ = 200; print $#array;


4 202


DWIM is Perl's answer to Gödel

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Re^3: $# -variable?
by reneeb (Chaplain) on Jul 27, 2006 at 12:59 UTC
    If someone plays with $[, and you are using a loop as shown above, you have problems with both expressions $#array and scalar(@array).

    So, if you want to ensure that your loop does what you want, you have to use this one:

    #!/usr/bin/perl use strict; use warnings; $[ = 3; my @array = qw(1 2 3 4); for my $i($[ .. $[ + (scalar(@array) - 1) ){ print $array[$i],"\n"; }

    #!/usr/bin/perl use strict; use warnings; $[ = 3; my @array = qw(1 2 3 4); for my $i($[ .. $#array ){ print $array[$i],"\n"; }

      I would hope these days that $[ is virtually never used. I can imagine a few places where it may be tempting to use, but none where there are not much better techniques available.

      $['s biggest problem is the surprise factor. Non-zero based arrays are not the norm in Perl and using them is likely to make the code obscure and hard to maintain and its bigest weakness is that it provides nothing that cant be done better differently.

      DWIM is Perl's answer to Gödel

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