Create and use references to hashes and anonymous hashes.
- [Voiceover] Hash references are extremely common in Perl.…Perhaps even more common than named hashes.…They are simple and convenient,…and you'll probably use them often.…Here is a working copy of hashref.pl…from Chapter 11 of the Exercise Files.…And you notice, beginning on line seven,…I declare a hash in the normal way,…and then I create a reference to the hash, here in line 15,…and you notice I'm using the backslash reference operator…to take a reference of the hash…and assign it to the scalar $ref.…
Then I have a "foreach" loop,…and I'm dereferencing the hash reference,…and I'm using "sort" and "keys"…to get a sorted list of the keys,…and then I dereference an individual element…using a key inside of the loop.…So when I save this and run it,…you notice I get a sorted list of the keys,…so they are in the order five, four, one, two, three,…because that's the alphabetical order of the strings,…and we have the key and the value there in the result.…
Now, again, just like with the array,…I can create the anonymous hash…
Watch to learn the details of the Perl syntax, from variables, conditionals, loops, and data structures to regular expressions, functions, and references. A quick-start guide is included for experienced developers who want to get up and running with Perl 5 fast, and the entire course is recommended for both new and experienced programmers alike. Later chapters cover file handling and reusing code with Perl modules, plus Perl best coding practices.
- Understanding Perl's general syntax and the anatomy of a Perl script
- Writing statements and expressions
- Creating assignments
- Working with variables and strings
- Using data types effectively
- Defining logical flow with conditionals and loops
- Using special variables
- Using Perl operators
- Performing simple Perl programming tasks with expressions
- Matching data
- Defining and calling functions
- Using references
- Handling files in the file I/O
- Using built-in functions
- Reusing code with modules
- Coding with Perl best practices
Skill Level Intermediate
1. Setting Up
About Perl3m 36s
2. Quick Start
3. Basic Syntax
4. Values and Variables
7. Special Variables
9. Regular Expressions
11. References and Structures
12. File I/O
13. Built-In Functions
15. Best Practices
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