Learn how whitespace and comments are handled in Perl.
- [Voiceover] Comments and whitespace are…an important part of any source code file.…This is even more important in…a scripting language where the code tends to be more fluid.…Here's a working copy of countlines.pl…from Chapter 3 of the exercise files.…And in this file, you'll notice that there…is whitespace, there's a blank line here,…there's a blank line there, there's a space here,…but there's also all these new lines.…All the new lines also count as whitespace.…In fact, in Perl, whitespace can be any of…space characters, tab characters, new lines,…carriage returns, and a few other less common characters.…
Whitespace is mostly ignored in Perl.…For example, I'll go ahead an run this,…you'll see the result, it's counting the lines…in this file, we've seen this before.…I can go ahead and I can take out…all kinds of whitespace here,…like that,…and I could do this all along here.…I'm gonna go ahead and just finish taking out…all the whitespace in this main function,…of course not within the string,…and there that bracket is now at the end of that line,…
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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