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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?
Sorted hash in Perl using Tie::IxHash
Key/Value Hash Slices
Create hash from two arrays: keys and values
How to sort a hash in Perl?
How to sort a hash of hashes by value?
The Hash-bang line, or how to make a Perl scripts executable on Linux
Reading CSV file as many hash-es
The easiest way to find the highest hash value without looping through all of them (max)
delete an element from a hash
exists - check if a key exists in a hash
exists, delete in hash - video
Fast lookup by name or by date - Array - Hash - Linked List
Can't use string (...) as an HASH ref while "strict refs" in use at ...
Useless use of hash element in void context
Merge hashes of arrays
undef on Perl arrays and hashes
each - iterate over Perl hash elements pair-by-pair