Moose testing type constraint
How to sort a hash in Perl?
How to sort a hash of hashes by value?
How to dereference a reference to a hash or to an array in Perl
Merge hashes of arrays
Moo with hash reference as attributes - with or without default values
How to check if string is empty or has only spaces in it using Perl?
delete an element from a hash
exists - check if a key exists in a hash
exists, delete in hash - video
each - iterate over Perl hash elements pair-by-pair
Key/Value Hash Slices
Reading CSV file as many hash-es
The easiest way to find the highest hash value without looping through all of them (max)
Search for hash in an array of hashes
Create hash from two arrays: keys and values
Exchange values and keys of a hash - how to reverse a hash
Hashes in Perl