Inconsistent behavior concerning "Can't use an undefined value as an ARRAY reference"...

Analysis of a Perl autovivification example...

Autovivification doesn't work even as lvalue...

How to avoid hash autovivification?...

Nested defaultdict of defaultdict...

What is the best way to implement nested dictionaries?...

Why does $foo->{bar} autovivify but %$foo doesn't?...

"no autovivication" pragma fails with grep in Perl...

How do I disable autovivification in Perl?...

perl check nested hash reference...

What's the Ruby equivalent of Python's defaultdict?...

perl autovivification when calling subroutine...

How to assign hash['a']['b']= 'c' if hash['a'] doesn't exist?...

Unintentionally adding keys to hash while iterating...

perl6 Catching non-fatal exceptions in autovivification...

PHP autovivification...

Why perl autovivification does not work for ->@* but ->@[0] does?...

How to create nested dictionaries with duplicate keys in python...

Autovivification in C#...

Autovivification and Javascript...

Why I can get subroutine address before it is declared without error?...

Why autovivification works at 'for'?...

Unexpected autovivification of arguments...

How can I pre-increment at an empty array index without throwing a notice?...

Is there a library to support autovivification on Javascript objects?...

Perl auto-vivification on assignment...

Is there autovivification for Go?...

How to implement autovivification for Ruby structs?...

In a dict of dicts, how do you emulate Perl's auto-vivification behavior?...

One line tree implementation...