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)

---

---

Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!

Titles consisting of a single word are discouraged, and in most cases are disallowed outright.

Read Where should I post X? if you're not absolutely sure you're posting in the right place.

Please read these before you post! —

• How do I compose an effective node title?
• How do I post a question effectively?
• Markup in the Monastery

Posts may use any of the Perl Monks Approved HTML tags:

a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr

You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)

	For:		Use:
	&		&
	<		&lt;
	>		&gt;
	[		&#91;
	]		&#93;

Link using PerlMonks shortcuts! What shortcuts can I use for linking?

See Writeup Formatting Tips and other pages linked from there for more info.