autovivification

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Getting frequency of nested elements, with relationship retained

I have an array of shop objects which belong to city objects which belong to prefec开发者_运维问答ture objects[详细]

2023-03-25 10:11 分类：问答
Perl vivification question while dereferencing undefined array reference

I\'m having tough time in understanding why the following works: my $array_reference; foreach $element (@{$array_reference}) {[详细]

2023-03-14 18:15 分类：问答
Does PHP have autovivification?

Searching PHP.net for autovivification gives no results. At the time of writing, Wikipedia claims that only Perl has it. There are no clearly definitive results when searching Google for \"php autoviv[详细]

2023-03-05 07:27 分类：问答
PHP autovivification

Update: My original intention for this question was to determine if PHP actually has this feature. This has been lost in the answers\' focus on the scalar issue. Please see this new question instead:[详细]

2023-03-04 21:06 分类：问答
How to assign hash['a']['b']= 'c' if hash['a'] doesn't exist?

Is there any way simpler than if hash.key?(\'a\') ha开发者_JAVA技巧sh[\'a\'][\'b\'] = \'c\' else hash[\'a\'] = {}[详细]

2023-03-02 10:01 分类：问答
Python: How to update value of key value pair in nested dictionary?

i am trying to make an inversed document index, therefore i need to know from all unique words in a collection in which doc they occur and how often.[详细]

2023-02-12 21:01 分类：问答
Autovivification in PHP

if I have this SQL query: select substring(id for 2) as key, yw, count(*) from pref_money group by yw, key[详细]

2023-01-27 05:24 分类：问答
Why is `exists` modifying my constant?

The exists function can unexpectedly autovivify entries in hashes. What surprises me is that this behavior carries over to constants as well:[详细]

2023-01-21 16:22 分类：问答
How to handle combination []+= for auto-vivifying hash in Ruby?

In order to implement auto-vivification of 开发者_如何学运维Ruby hash, one can employ the following class[详细]

2023-01-06 09:46 分类：问答
In a dict of dicts, how do you emulate Perl's auto-vivification behavior? [duplicate]

This question already has answers here: What is the best way to implement nested dictionaries? 开发者_如何学编程[详细]

2023-01-05 06:29 分类：问答