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Illuminations

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Welcome to the Illuminations!

Here you will find questions (from the Seekers of Perl Wisdom section) which have been esteemed by our venerable monks to be exceptional.

These questions are organized with categories (tags, keywords).

These exceptional questions will likewise have one or more replies which have been deemed best.

When you're viewing the SoPW section, or the threaded view of a question, each exceptional question and its best replies are indicated with a nice golden star: ⭐

The users empowered to designate questions and answers as "exceptional" are the Q&A Editors group.

For further information, see the FAQ How are the Illuminations maintained?

Good Questions in categories (subroutines)


Can I make recursive calls to subroutines? — 2⭐ / 3
Is it better to return a hash of hashes or a reference to a hash of hashes? — 2⭐ / 5
Running subroutines asynchronously — 3⭐ / 4
Is it computationally expensive to return a large string (50-100 kB) from a sub? — 2⭐ / 2
Subroutine args by-value vs. by-ref — 1⭐ / 2
Why does my subroutine not receive the scalar parameter as $_? — 1⭐ / 3
Can I get a subroutine's name from inside the subroutine? — 1⭐ / 1
How do I pass more than one array or hash to a subroutine — 2⭐ / 2
What is the difference between 'local' and 'my'? — 2⭐ / 5
calling a sub using its name assigned to a variable ? — 1⭐ / 2
How do I place a subroutine in an external file and call it? — 1⭐ / 4
Do I write one large program or lots of small programs? — 1⭐ / 1
Subroutine accessible as yourdomain.com/cgi-bin/foo.pl?foo — 1⭐ / 2
How to deal with undefined returned variables. — 2⭐ / 4
Is it possible to do pass by reference in Perl? — 5⭐ / 9
Defining a subroutine one of two ways depending on whether a package exists — 1⭐ / 4
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