Get a quick intro to functions and postfix notation.
- [Voiceover] In this lesson, we'll use a function…to read lines from a file and we'll learn…a few more essential Perl features.…Here's a working copy of countlines3.pl…from the Chapter 2 of the exercise files.…In Perl, a function is sometimes called a sub-routine.…The two terms are used interchangeably,…mostly for historical reasons.…I mostly use the term function.…A function is simply a reusable block of code…that may accept parameters and may return a value…and has its own scope.…
We'll get into a lot more detail about functions…later in this course.…For now, here's a few important points about functions.…A function is declared with the sub keyword.…You'll notice here on line 11,…the sub main, that defines that function main.…Parameters are passed as an array of scalers…and may be accessed with the shift keyword.…You notice here that I do this here.…This is the main function.…It's a come technique for keeping code organized.…
Notice that I call main on line 8…and when I call it, I pass it in array…and this array is called ARGV.…
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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