Get a quick intro to loops and conditionals.
- [Voiceover] In this lesson, I'll give you a very brief…overview of conditionals and loops in Perl.…This is actually a big subject,…and it's an area where Perl is far more flexible…than many other languages.…It will be covered in more detail later in the course.…Here I have a working copy of countlines2.pl…from Chapter 2 of the exercise files.…In this version of countlines, we'll read the file…one line at a time, so we're no longer reading…the entire file into memory at once.…This allows us to count much larger files.…
Of course, we're just still counting our little 50 line…linesfiles.txt file.…Here in line six, you'll notice that I use…IO::File;…This reads in the IO File module.…This is an object-oriented file-handling library.…In line 11, we created an object using…this library,…and the object interface is stored in…the $fh scalar variable.…
Line 12 is a simple conditional.…It tests if the $fh variable is false, which would indicate…that the object construction failed.…The block within the braces on lines 13-15…
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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