Errata

Remove the ending right parenthesis ")" after "list context"

The words "that" and "modules" appear to have been swapped and the word "with" seems superfluous. The sentence currently reads:

Throughout this book, we?ll try to identify that modules come with perl (and usually,
with which version of perl first included them).

This should probably read:

Throughout this book, we?ll try to identify modules that come with perl (and usually,
which version of perl first included them).

(Note that I previously reported an error in this sentence, but did not include removal of the word "with" in that report.)

The line currently reads:

We?ve included on the top portion of the documentation to show the most important

This is referring to the top part of the output of "perldoc File::Basename". The word "on" is not appropriate. Should probably read:

We?ve included the top portion of the documentation to show the most important

"Although we don't go into here"
should be
"Although we don't go into it here".

The value of $basename should be "plan7.rtf", not "plan 7.rtf". No embedded space.

Sentence starts with

If we have the a recent version of Perl, should also already have Module::CoreList

This should probably be:

If we have a recent version of Perl, we should also already have Module::CoreList

Note from the Author or Editor:
Changed as noted in r546856.

"One way to fix this is to add a BEGIN block around the push" should be "One
way to fix this is to add a BEGIN block around the unshift".

Middle of paragraph seems to be missing the word "do". Line shows as:

as friendly since not only we have to change the code but also because it might not be

Should probably be:

as friendly since not only do we have to change the code but also because it might not be

It appears that there is no longer a "country_code" method available in the Business::ISBN module. I am assuming you meant "group_code"?

Note from the Author or Editor:
country_code was correct at the time of printing. The module changed to group_code, the correct term according to the ISBN Agency, after printing.

"Now instead of copying the entire provision list into the @_ array, we get A SINGLE ELEMENT OF A REFERENCE to that provisions array."

shouldn't it say "we get a single element, which is a reference to that provisions array."

maybe showing a major lack of my understanding but this doesn't quite make sense to me.

Note from the Author or Editor:
change to "we get a single element which is a reference to
that provisions array.".

"When we compare reference with ==" should read "When we compare references with =="

Note from the Author or Editor:
Change as noted

"The show_hash subroutine expects a hash and ..." should read
"The show_hash subroutine expects a hash reference and ..."

Note from the Author or Editor:
Change as noted

Currently reads:
----
If the scalar already has a value, this doesn't work because Perl won't stomp on our
data.
----

This should read:
----
If the scalar already has a value, this doesn't work because Perl won't stomp on our
data. Perl tries to use the value in C<$log_fh> as a symbolic reference, so it tries
to print to the filehandle named C<5>. Under C<use strict>, this is a fatal error.
----

In the 10/07 printing, it currently reads:

'...Perl tries to use the value in C<$log_fh> as a symbolic reference, so it tries to print to the filehandle named C<5>. Under C<use strict>, this is a fatal error.'

The 'C<...>' text is in a larger monospace font never before used before in the book. I saw a note about this in errata for the most recent printing saying to *add* this sentence. I'm guessing they meant that C<alpha> signifies that 'alpha' should be formatted as code.

Note from the Author or Editor:
Remove the C<> formatting codes and print their contents in the code font.

In line 6 IN should be $IN::
1 while (@handlepairs) {
2 @handlepairs = grep {
3 my ( $IN, $OUT ) = @$_;
4 my $line;
6 defined( $line = <IN> ) and print $OUT $line;
7
8 } @handlepairs;

Note from the Author or Editor:
Fixed in sources (revision 426516)

The only difference between a class method and an instance method is
whether the first parameter is an instance (a blessed reference) or a
class name (a string).

should read instead:

The only difference between a class method and an instance method is
whether the first parameter is a class name (a string) or an instance (a
blessed reference).

"We've been burned in the past when a setter became a getter because
another function returned more parameters than expected after an
upgrade."

should read:

"We've been burned in the past when a getter became a setter because
another function returned more parameters than expected after an
upgrade."

"setter became a getter"
should read
"getter became a setter"

Note from the Author or Editor:
Change as noted

All references to subclasses should be turn to superclasses. You don't inherit
from subclasses.

Note from the Author or Editor:
Change as noted

package Cow;
use parent qw(Cow);
sub sound { 'neigh' }
1;

... should be ...

package Cow;
use parent qw(Animal);
sub sound { 'moooo' }
1;

Note from the Author or Editor:
Fixed in r546857.

[...], how we do we test the test?
should probably read
[...], how do we test the test?

Note from the Author or Editor:
Change as noted

Code sample generates one warning and one error if run with perl -w.
The problem is with the file test.

#!/usr/bin/perl

my @smaller_than_1000 = grep { -s < 1000 } @ARGV;

print map { " $_
" } @smaller_than_1000;

the -s < is ambiguous to the interpreter, so fails when the interpreter tries to resolve < to the first part of a diamond operator.
grep { (-s) < 1000 } @ARGV; # works
grep { 1000 > -s } @ARGV; # also works

The same applies for the one-liner 2nd example:
print map { " $_
" } grep { -s < 1000 } @ARGV;

Note from the Author or Editor:
Change to have parens around the -s calls. All -s should be (-s).

"country_code" method seems to no longer exist.

Note from the Author or Editor:
The country_code method is now the group_code method. The book was correct at the time of printing.

use Exporter is redundant, use base qw(Exporter) already takes care of that.

Note from the Author or Editor:
remove the line that says

use Exporter;