From your question, I am assuming you are an experienced Python programmer, but new to Perl.

If you're looking for something similar to Python list comprehensions in Perl, start by mastering the basic Perl built-ins: foreach, map and grep. As LanX has pointed out, map is the right fit for your specific example. Effective Perl Programming has a nice item "Use foreach, map and grep as appropriate", which provides a handy summary of when to use foreach, map and grep:

• Use foreach to iterate read-only over each element of a list
• Use map to create a list based on the contents of another list
• Use foreach to modify elements of a list
• Use grep to select elements in a list

If you are interested in functional style programming in Perl, once you've mastered these basics, move on to the Perl core List::Util module. After that, CPAN List::MoreUtils.

Choosing "good" modules from CPAN is a bit of a dark art. Remember, CPAN is a "commons" with a very low barrier of entry ... so it is full both of gems, and utter rubbish. Before adding a dependency to some random third-party CPAN module, I suggest you check some basic things, to get a feel for how good the module is, like the module rating, CPAN Testers results, change log, test suite, reputable author responsive to bug reports, reported bug list, META.yml/json, pre-reqs, license, kwalitee, and so on, then perhaps google for the module to get a feel for how widely used it is and what folks think of it.

For List::Comprehensions, we see:

• No reviews. That is, nobody has bothered to review or rate it.
• No change log. No license. No META.
• The module has not been updated since 2003. Probably abandoned.
• This is the only module written by this author.
• Test results ok, but test suite not comprehensive (just one tiny test.t file).

Contrast with, for example, List::MoreUtils:

• Seven reviews. Good rating score.
• Comprehensive change log.
• The module has been updated many times.
• This author has written over 100 CPAN modules.
• Test results ok, test suite has six .t files and a Test.pm.

See Also

• List Utils References
• Re^2: using ef to hash of hash effectively (foreach, map and grep References)

> I already found List::Comprehensions

ugh ...

update

¹) yep :)

  DB<8>  [ map { 10-$_ } 1..10 ]
 => [9, 8, 7, 6, 5, 4, 3, 2, 1, 0]
[download]

Works like a charm, thanks!

You asked explicitly for an array reference, that's why I showed you this rather uncommon construction.

NB: in Perl you don't need the brackets for a plain list or a "normal" array (i.e. in "list form" @array )!

update

in > 90% of all cases something like

my @output = map { $_->meth } @input

is preferred and as soon as you really need a reference you'll use \@output

Cheers Rolf

_{(addicted to the Perl Programming Language and ☆☆☆☆ :)}