Having done some tests, and it also seems to make perfect sense to me... the 2nd version,
my @slice=@{$href}{'item1','item2'};
Is the only one which seems valid for the purpose at hand. The target is to get a hash slice, which is array (ahem, list) context, so
@{$href} is what places it in that context, dereferencing as an array, to mimic
@hash{'item1','item2'}
${$href} on the other hand attempts to dereference as a scalar, which, in my test, didn't yeild anything but undef:
#!/usr/local/bin/perl
use strict;
my %hash = map { chr(ord('@')+$_) => $_ } (1..26);
my $hashref = \%hash;
my @list = qw/A B L S Z/;
my @slice = @{$hashref}{@list};
my $multi = ${$hashref}{@list};
print '@slice == ['. join(', ', @slice). "]\n";
print "\$multi == '$multi'\n" if defined $multi;
print "\$multi == undef\n" if !defined $multi;
Output:
@slice == [1, 2, 12, 19, 26]
$multi == undef
So it seems only one of these gets the desired result, and thus no ambiguity.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.