Perl Cookbook, Second Edition > Hashes > Hashes with Multiple Values per Key - Pg. : Safari Books Online

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Perl Cookbook, Second Edition

Perl Cookbook, Second Edition

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Contents

Ch. 3. Dates and Times

Recipe 5.1. Adding an Element to a Hash

Recipe 5.2. Testing for the Presence of a Key in a Hash

Recipe 5.3. Creating a Hash with Immutable Keys or Values

Recipe 5.4. Deleting from a Hash

Recipe 5.5. Traversing a Hash

Recipe 5.6. Printing a Hash

Recipe 5.7. Retrieving from a Hash in Insertion Order

Recipe 5.8. Hashes with Multiple Values per Key

Recipe 5.9. Inverting a Hash

Recipe 5.10. Sorting a Hash

Recipe 5.11. Merging Hashes

Recipe 5.12. Finding Common or Different Keys in Two Hashes

Recipe 5.13. Hashing References

Recipe 5.14. Presizing a Hash

Recipe 5.15. Finding the Most Common Anything

Recipe 5.16. Representing Relationships Between Data

Recipe 5.17. Program: dutree

Ch. 6. Pattern Matching

Ch. 7. File Access

Ch. 8. File Contents

Ch. 9. Directories

Ch. 10. Subroutines

Ch. 11. References and Records

Ch. 12. Packages, Libraries, and Modules

Ch. 13. Classes, Objects, and Ties

Ch. 14. Database Access

Ch. 15. Interactivity

Ch. 16. Process Management and Communication

Ch. 17. Sockets

Ch. 18. Internet Services

Ch. 19. CGI Programming

Ch. 20. Web Automation

Ch. 21. mod_perl

URL

Help

Recipe 5.8. Hashes with Multiple Values per Key

5.8.1. Problem

You want to store more than one value for each key.

5.8.2. Solution

Store an array reference in $hash{$key}, then put the values into the referenced array.

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