Learn how to create constants in Perl.
- [Voiceover] Perl doesn't actually…include Constants in the Definition of the Language.…However, the standard Distribution does…include a Pragma for this purpose.…Here's a working copy of Constant dot PL…from Chapter Four of the Exercise Files,…while Perl does not include a Constant Type,…it does have this Pragma in its Default Distribution.…So you'll notice here on Line Seven, Eight, and Nine,…on creating Constants using the Use Constant Pragma,…and if I go ahead and run this,…you'll see I have Say Pi, and there's the Pi Value,…and I'm testing this Constant True, and that is working.…
So, as you can see the Syntax is…similar to defining a Hash.…You say Use Constant, and then you have the Token,…the name of the Constant, then Equals…and Greater-Than symbol together as one Operator,…you can call it an Operator, and then the Value…that that Constant is being defined as.…This is pretty simple and you can see…it's pretty easy to define a few Constants.…On the other hand, you can also define…several Constants at once using braces like this.…
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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