Learn how to use control statements to shortcut your loops.
- [Voiceover] Perl provides a number…of loop control statements which may be…used to modify the behavior of a loop.…Here's a working copy of control.pl…from chapter six of the exercise files,…and you notice we have a simple while loop,…and it uses the shift function to take an element…off of the array and then it uses say to display it.…Very simple.…We have the same array we've been using this chapter…using quote words with five strings,…one, two, three, four, and five.…I've also added a variable that we're going to use,…$x, a scalar variable, with the string three in it.…
Now, when I go ahead and run this,…you see it does what we expect.…It displays these five strings in order.…Now, if I want to, I can skip one of these strings…with the next control.…I say next if $x is equal to $y,…and that's the string comparison equal.…And I'll go ahead and I'll run this,…and you see, now it says one, two, four, five.…It's skipped number three.…So, what next it does is it short circuits the loop…and it just goes to the next iteration without executing…
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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