Learn branching with the if statement.
- [Voiceover] Pearl provides a complete set…of conditional branch statements…starting with the basic if.…Here's a working copy of conditional.pl…from chapter five of the exercise files.…The if statement is probably…the most common conditional in Pearl,…or in most language.…So it seems like a good place for us to start.…The if keyword,…as you can see down here on line 10,…the if keyword is followed by a logical condition…in parentheses.…You can see there it's $x == 1.…
That double equals sign is the conditional test for equality…and the condition is evaluated first,…and if it's true…the block of code is executed.…And you see that block of code here…starting with this curly brace…ending with that curly brace on line 12.…If the condition is not true,…then the next line of code after the block is executed,…and the code inside the block is never executed.…Either way, after the block is executed…then the next line of code is run anyway.…
So if I go ahead and run this,…you see it prints true,…and then it says x is 1 and y is 1…
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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