Learn how to use hashes in Perl.
- [Voiceover] Hashes, sometimes called associative arrays,…are very powerful and very common in Perl.…Here's a working copy of hash.pl from Chapter four…of the exercise files.…A hash is a special kind of an array…that associates keys and values.…You'll notice that the hash variable is introduced…with a %…and it's defined using a bare word key.…Of course you can put it in quotes…if you need to include whitespace in it,…but a bare word is allowed there,…followed by an association symbol, which is…two characters: an = and a >…and then a value, which in this case is a string,…but it can be any value,…and then a comma.…
Each of these key value pairs are separated by commas,…and it's all enclosed in parentheses.…So if I save and run this, you see that we get…these values.…We have a while list here, a while loop,…and it defines two variables and assigns them…the value from the hash.…This each operator is just getting each…successive value from the hash.…The hash itself is not stored in any particular order,…so you'll notice that our result is four, three,…
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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