Here's another way to do what you want, without creating an intermediate %keepers hash:
use strict;
use warnings;
use Data::Dumper;
# Data Structure
my %h = (
'a' => 'z',
'b' => 'y',
'c' => 'x',
'd' => 'w',
);
my @to_keep = qw{ a c };
%h = map { $_ => $h{$_} } @to_keep;
print Dumper \%h;
Update: If by chance your @to_keep array might contain elements that do not necessarily occur as keys in your input hash, it would probably be better to change the penultimate line to:
%h = map { $_ => $h{$_} } grep { defined $h{$_} } @to_keep;
-
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.
|