How to dereference a reference to a hash or to an array in Perl
Moo with hash reference as attributes - with or without default values
ref - What kind of reference is this variable?
Useless use of hash element in void context
Reading CSV file as many hash-es
The Hash-bang line, or how to make a Perl scripts executable on Linux
undef on Perl arrays and hashes
The easiest way to find the highest hash value without looping through all of them (max)
Sorted hash in Perl using Tie::IxHash
Hashes in Perl
How to sort a hash in Perl?
How to sort a hash of hashes by value?
Merge hashes of arrays
Exchange values and keys of a hash - how to reverse a hash
each - iterate over Perl hash elements pair-by-pair
How to get a slice of a hash?
Create hash from two arrays: keys and values
Key/Value Hash Slices
Fast lookup by name or by date - Array - Hash - Linked List