Strict mode and warnings will help you to keep your code clean and reliable.
- [Voiceover] Perl's strict and warnings pragmas…are so important I can't imagine…a situation where I wouldn't use them.…Here's a working copy of warnings.pl…from chapter 15 of the exercise files.…Strict mode is now considered so necessary…that it's turned on by default…if you have a used version statement…for a version of Perl over 5.12,…and you see here we do have 5.18 in all of these scripts.…So, strict mode is turned on by default…and I would never even imagine turning it off.…On the other hand, warnings mode is still optional…and that's why it's important.…
So you notice I have use warnings,…and again I have that in all of the scripts in this course.…So I want to demonstrate why this is…important down here in this function.…So I'm going to go ahead and run this,…and you see it says the result is four,…and that's because this function…it returns the number three element,…so zero, one, two, three,…it's the string that says four,…returns that element from this array.…And you notice that I'm using the at sign…instead of the dollar sign, which is technically wrong,…
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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