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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?
undef on Perl arrays and hashes
Sorted hash in Perl using Tie::IxHash
How to sort a hash in Perl?
How to sort a hash of hashes by value?
Dumping a hash - video
Hash of Arrays in Perl
Useless use of hash element in void context
Reading CSV file as many hash-es
The easiest way to find the highest hash value without looping through all of them (max)
Multi dimensional hashes in Perl
A hash and its uses - video
Creating a hash - video
Creating a hash from an array - video
Fetching data from a hash - video
Hashes in Perl
hash in SCALAR context - video
Printing hash of hashes of arrays by the array