Learn about function references and closures.
- [Voiceover] Perl also supports function references…which may not be as common as array or hash references…but they can be useful for a number of purposes.…Here's a working copy of func.ref.pl…from Chapter 11 of the Exercise Files.…And you notice that I have a function…that I've defined down here, starting on Line 10,…and here on Line 7, I'm taking a reference…to that function, and so there's the name…of the function, and this ampersand indicates…that that symbol is a function symbol,…just like the percent sign indicates a hash…or the at sign indicates an array.…
And then I take the reference…with the reference operator…and I assign it to the reference scaler.…And now I call it, again I'm using that ampersand,…and the curly braces are around the reference itself.…And the parentheses, which is the function call operator.…And so when I run this, you see I get the result,…"This is the excellent function."…So it's calling the function through the reference.…Okay, so that much probably seems familiar by now.…Of course, I can also use the arrow operator 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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