Learn how to create a function in Perl.
- [Voiceover] In Perl, a function is defined…using the sub keyword.…Here's a working copy of hello.pl from Chapter 10…of the Exercise Files.…Let's start by creating a simple function.…I'm gonna delete that line,…and instead, I'm going to create a function called hello.…In the body of the function, I'm going to say…this is the hello function.…So, this is a simple function.…It has one statement.…The name of the function is hello.…
The body is a block in curly braces,…and it's called using the function call operator.…So, I say hello with two parenthesis.…That is the function call operator.…If I had parameters,…I would put parameters inside the parenthesis,…but this is very simple.…So, when I save this and run it,…the function is called, and it displays the message.…So, this is a very simple example of a function.…We'll add to this with parameters and return values…and other features as we continue in this chapter.…
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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