How To Tutorial: Perl Functions for Real %HASHes


"Find Out How You Can Use The Perl Functions For Real %HASHes In The Most Frequent Situations You’re Confronted With When You Write A Perl Script … See In Minutes A Lot Of Complete Code Solutions From Which You Can Copy Pieces of Code And Paste Them Directly In Your Own Script"
The "Perl Functions for Real %HASHes - How To Tutorial" eBook answers the most frequently questions regarding the use of the hash functions in the Perl language. You’ll find interesting and complete examples about why, how and where you can use these functions in a Perl script.



The functions described in this eBook include: delete, each, exists, keys, values.

For every function, I presented the syntax forms and a brief description. This was necessary to help you better understand how to use the topics. If you want a complete description of these functions, you should go for additional information to the Perl official site by following the link perldoc.

If you take your time to skim through the Table of Contents of this eBook, you’ll see what you should expect to find here. From using these functions with simple arrays and hashes or with more complex data structures as arrays of hashes, hashes of arrays or hashes of hashes, you’ll find here a lot of commented examples to help you find a quick solution to your problem.

The examples included in this eBook are not only about the hash functions, but also show you how to use these functions together with the operators, special variables, statements, regular expressions and with simple or complex data structures. In the same time are provided interesting examples about how to use these functions with @$_, %{}, ||, &&, =>, @{}, [], {}, $_, $".

Complete solutions are provided for almost all the examples. Each example can be tested, modified and run individually. Every example shows you a way to resolve a specific problem, allowing you to find out a quick answer to your problem or question.


Now You Can Save Time And Find In Minutes The Answer To Your Question

If you want to improve your programming skill regarding the use of the real hashes functions in different contexts, you’ll find real help in this eBook. I chose for you the most frequent questions and I illustrated them with the appropriate examples.

Of course you can continue searching through the forums to find the answer of your question but in this case you need to choose, test and interpret yourself the information provided in the forums.

In this eBook I give you a lot of working code that you can implement in minutes in your script. And not only that, all the provided code snippets are fully functional, i.e can be copied and tested in your command line window. Next, they can be integrated in a script and uploaded to your site.

In order to make the scripts very easy to understand, I commented in detail each code snippet so you will not have any problem to understand and implement it.

Table Of Contents

I think you can use this eBook to find out very fast how to use the Perl real hashes functions in different situations.

Please take a look at the table of contents to see what I mean:

1. Copyright
2. Introduction
  2.1. How to run the examples included in this eBook
    2.1.1. How to run the script in Windows
    2.1.2. How to run the script in Linux
    
3. Functions for real %HASHes
    
  3.1. The delete function
    3.1.1. The syntax forms
    3.1.2. How to us delete on a hash inside a foreach loop
    3.1.3. How to use delete with a hash reference
    3.1.4. How to return the deleted entries from a hash
    3.1.5. How to use delete on an array
    3.1.6. delete versus undef
    3.1.7. delete versus grep on an array
    3.1.8. delete versus splice on an array
    3.1.9. How to use delete against an array of hashes (@AoH)
    3.1.10. How to use delete against a hash of arrays (%HoA)
    3.1.11. How to use delete against a hash of hashes
    
  3.2. The each function
    3.2.1. The syntax forms
    3.2.2. How to use the each function with a hash
    3.2.3. How to use the each function with an array
    3.2.4. How to use each with delete
    3.2.5. How to use the each function with an array of hashes (@AoH)
    3.2.6. How to use the each function with a hash of arrays (%HoA)
    3.2.7. How to use the each function with a hash of hashes (%HoH)
    
  3.3. The exists function
    3.3.1. The syntax forms
    3.3.2. How to use exists with hashes
    3.3.3. How to use exists with a hash reference
    3.3.4. How to use exists with arrays
    3.3.5. How to use exists with subroutines
    3.3.6. How to use exists with next and unless
    3.3.7. How to use exists with a hash of arrays (%HoA)
    3.3.8. Using exists to avoid autovivification in a hash of hashes (%HoH)
    
  3.4. The keys function
    3.4.1. The syntax forms
    3.4.2. How to use keys in a list context
    3.4.3. How to use keys in a scalar context
    3.4.4. How to use keys with a hash reference
    3.4.5. How to use keys with while
    3.4.6. How to use keys with foreach
    3.4.7. How to use keys with grep
    3.4.8. How to use keys with map
      3.4.8.1. How to print the elements of a hash
      3.4.8.2. How to get the union of two arrays
    3.4.9. How to use keys with grep, map and regex
    3.4.10. How to sort the hash keys
    3.4.11. How to sort the hash values
    3.4.12. How to sort the hash keys by length
    3.4.13. How to sort the hash values by length
    3.4.14. How to use keys against an array of hashes (@AoH)
    3.4.15. How to use keys against a hash of arrays (%HoA)
      3.4.15.1. How to filter the elements of the inner array
      3.4.15.2. How to print a hash of arrays using keys and foreach
      3.4.15.3. How to print a hash of arrays using keys and map
      3.4.15.4. How to use sort and keys on a hash of arrays
    3.4.16. How to use keys against a hash of hashes (%HoH)
      3.4.16.1. How to retrieve the unique values from a hash of hashes
      3.4.16.2. How to use sort and keys with a hash of hashes
    
  3.5. The values function
    3.5.1. The syntax forms
    3.5.2. How to use values with hashes
    3.5.3. How to use values with arrays
    3.5.4. How to use values with a hash reference
    3.5.5. How to join or to extract the hash values to an array
    3.5.6. How to grep the hash values
    3.5.7. How to sort the hash values
    3.5.8. How to remove duplicates hash values
    3.5.9. How to use values with an array of hashes (@AoH)
    3.5.10. How to use values with a hash of arrays (%HoA)
    3.5.11. How to use values with a hash of hashes (%HoH)

And as a bonus, I give you a "Perl Glossary" eBook to help you better understand the topics included in my tutorial.

A Sample From My eBook

To have a first look about what you could expect to find inside, I invite you to download for free a sample from my "Perl Functions for Real Hashes - How to Tutorial" and "Perl Glossary" eBooks.

What You’ll Get
  • A 71 page "Perl for Real %HASHes Functions - How To Tutorial" eBook (PDF format)
  • I prepared a bonus for you – an additional glossary eBook (PDF format) meant to help you understand the topics included in this eBook tutorial
  • After I’ll modify or extend the eBook (maybe at your suggestion), the download link provided will let you download for free the upgraded version - please note that the download link will expire after 9 attempts
I intend to enlarge this eBook with a lot of other useful examples, but I am going to increase the price, too. Buy this eBook now! And you can download it for maximum 9 times, having free access to the following upgrades.

If you consider that this book is valuable or you have some suggestions to improve its content, please send me some feedback through my contact page.



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