In this movie, you'll learn about blocks of code and variable scope.
- [Voiceover] In Perl, a block of code is enclosed…in curly braces, here's a working copy…of blocks.pl from chapter 3 of the exercise files,…and you'll notice that there are two blocks…in this file.…The function, which begins on line 13, you notice,…it has an open curly brace on line 13,…and a closed curly brace on line 17.…And this foreach loop, which has an open curly brace…on line 14 and a closed curly brace on line 16.…
So these are two different blocks.…Now there's three variable that are declared…outside of any of these blocks,…and they are declared here on line 7, 8, and 9,…and they're named alpha, beta, and charlie.…Now you'll notice that they have a my keyword.…The my keyword is used to give scope to a variable.…And, it gives local scope to the variable…to the innermost file or block…where the variable is declared.…So, for example, this alpha, beta, and charlie…the scope of these is the file because…they are not inside of a block.…
So if I go ahead and run this,…and I'm going to go ahead…and I'm going to copy this beta variable…
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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