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Questions tagged [hash-of-hashes]

A hash-of-hashes is a multi-dimensional hash that contains nested hashes.

A multi-dimensional hash is a flexible, nested structure where hash values are allowed to be other hashes. This data structure is natively supported by languages such as:

  • Perl
  • Python
  • Ruby

and may be simulated by others.

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How to access a multidimensional hash session?

I am using the session method of Ruby on Rails so that I have a session[:user_params] hash like this: password_confirmation: "test" password: test email: test@test.ij I can access that simply using the syntax session[:user_params] in my view…
user502052
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Building a hash of hashes to determine largest numerical value in ruby

I have a data file that looks like this: FBpp0070000 acyr193594273 acyr 866 FBpp0070000 acyr193577824 acyr 536 FBpp0070000 acyr193693009 acyr 445 FBpp0070000 bomb193605819 bomb 503 FBpp0070000 bomb193676398 bomb 101 FBpp0070001 acyr193618043 acyr…
user511038
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Perl -> compare same postitions in arrays in a hash of hashes of arrays

I working a on bash script made by a colleague. Since there is no multidimensional data structure in bash, there was lots of workarounds to process the input files. When I saw his script, I thought Perl can handle that much more easily. I did a…
Marc-Olivier Duceppe
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how does reduce or inject work in this code

Found this on code wars as one of the solutions. Can someone explain to me how "args.reduce(self)" works in this code; the block after makes sense. config = { :files => { :mode => 0x777 }, :name => "config" } class Hash def get_value( default,…
Wolf_Tru
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Trying to access a hash in a constant list of hashes in perl

Okay so this is my current code which works, but I need to access each error hash in a different way in order to be compatible with other parts of the program. Here is my Error list library: Type.pm package ASC::Builder::Error::Type; use strict; …
Paul Russell
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Multilevel Hash Default Parameters When Accessing Non-Existant Keys as in h[1][1] += 1

I'm trying to create a Hash of Hash-es. The value of the 2nd level hash is an integer defaulted to 0. What I'm trying to do is start with an empty hash of hashes, and then when I add a value if the key doesn't exist, they key should be added with…
John Dibling
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perl - help with hash and dumping of records

I have a perl script that is only keeping the last set of records for a named set and I have more than one set of records. So its over writing the data in the hash and just keeping the last set. I need help in printing out all the…
jdamae
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Dereferencing an array reference from a nested Perl hash

I hope I've stated that subject correctly. I have a hash of hashes that I've built from reading a file. The outer hash is groups, then the inner hash is parameters within that group. Each parameter value can either be a scalar or array, and the…
Andy
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help understanding perl hash

Perl newbie here...I had help with this working perl script with some HASH code and I just need help understanding that code and if it could be written in a way that I would understand the use of HASHES more easily or visually?? In summary the…
jdamae
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how to increment hash of hash in perl

failing to properly populate a HoH using this code: when i run the loop using below: while (my $form = $form_rs->next ()){ my $menu=$form->get_column("fmenu"); my $script=$form->get_column("fscript"); my…
rajeev
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Storing a hash of hashes in Redis

What's the best way to store an hash in Redis which looks like this: id1->{key1->value1, key2->value2, key3->value3….} , id3->{key1->value1, key2->value2, key3->value3….} …. where key1, key2, key3... is two-letters code of language (en, es, etc),…
Incerteza
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How to use the sort_by method to sort teams from Win/Loss Data

I'm confused as to how to use the sort_by method. How do I rearrange this: @final_leaderboard = { "Patriots" => {"Win"=>3, "Loss"=>0}, "Broncos" => {"Win"=>1, "Loss"=>1}, "Colts" =>…
Dan Rubio
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Perl - Hash of Hash - test if entry exists

I have a problem, when I try to find if a entry exists in my Hash of Hash and if it don't exists, Perl create me this entry. Exemple of my code : use warnings; use strict; my %hash; $hash{'key1'}{'subkey1'} = "value1"; if (…
user3009852
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Filter hash of hashes array to get only certain key & values

Using psd.rb gem to return a hash of the properties of a psd file. However I would like to somehow filter the results down just to the font name. Is there a method that can get the value of keys nested within a certain hash e.g the :font…
Sam Mason
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Perl: inserting array of arrays in into a array which is a value for a key

I have a need of inserting an array of arrays into an array.And this whole array is a value for a key in a hash.i meant hash should look like this: "one" [ [ 1, 2, [ [ 3, 4 ], [ 5, 6 ] …
user1939168
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