Discover how the default variable is used.
- [Voiceover] Perl uses special variables…for a number of purposes, including default values,…parameter passing, process control,…and configuration options.…The default value variable is used frequently.…If you've been following along,…you've probably seen this pattern already.…Down here on line 8 it says, say foreach @array,…and this is the post fix version of the foreach loop…and it prints out every value in the array…with the say function, so when I run this,…you see, it prints out one, two, three, four, five,…which is how we've initialized this array…using the quote word operator with the five values…one, two, three, four, and five.…
This actually uses the default value variable.…Most people just refer to it as the default variable,…even though there are a couple other ones…that are arrays that are used in different ways,…but this is often referred to as the default variable…because it is used so commonly.…Let's take a look at how this works.…I'm going to go ahead and replace this post fix foreach loop…with a normal foreach 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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