Learn how to alternate branches with else and elsif.
- [Voiceover] The if statement also provides…for alternate branches using else and elsif.…Here's a working copy of conditional.pl…from chapter five of the exercise files.…And I'm just going to come down here…and I'm going to say else say "false"…or I'll just put the word "else" in there.…We can see that the else condition is executing.…So if I go ahead and run this,…you see it says true.…If I change this to say x is 47,…then the else is executed instead of the true.…
So this second block after else…with those curly braces there,…that is what is executed when the condition is false.…So I'll change this back to one…and I'm going to add an elsif.…I'm going to say elsif,…and in Perl it is spelled with the s.…I get confused because I use so many languages.…$x equals say five.…And I can say "five".…
And I can add a couple more if I want to.…You can test for six and seven.…And I can just write these in here,…six and seven.…And now if I run this,…of course we have one.…But if I change this to five, save and run,…now it will say "else".…
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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