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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 (hashes)


How do I make a deep copy of a hash (or other data structure)? — 2⭐ / 2
Revision controlled Perl DataStructure — 1⭐ / 4
How do I push new data into an existing hash? — 2⭐ / 6
Union of Two Hashes — 1⭐ / 1
How to check similarity of two hash tables — 1⭐ / 2
How do I find out if a hash is empty? — 4⭐ / 7
Deleting Hash Entries while Iterating — 1⭐ / 3
Get the Key corresponding to any given value — 2⭐ / 4
How do I make all the values in %a with common keys in %b equal to %b's values? — 1⭐ / 7
How do I use a hash as a set? — 4⭐ / 5
How do I extract the number of times a value appears in a hash? — 1⭐ / 3
how to use reversehash if there are more than one keys same — 1⭐ / 1
How do I test if a 'thing' is a hash (or array or scalar)? — 2⭐ / 2
How do I modify the KEYS in a hash (copy) — 3⭐ / 6
How do I dynamically create a hash table? — 1⭐ / 7
How do I completely remove a key/value pair from my hash? — 2⭐ / 2
How do I empty out a hash? — 2⭐ / 3
How do I select a random key from a hash? — 3⭐ / 4
How Do I pass a hash to a subroutine? — 3⭐ / 6
how do i sort hash by key numerically — 1⭐ / 5
How can I find the number of elements in a hash? — 3⭐ / 5
How can I assign the elements in an array to only the key values in a hash? — 3⭐ / 5
Can a hash name have the same value twice. — 2⭐ / 8
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