Learn how to report errors with the die() function.
- The die function will display an error message…and then immediately exit the script.…This is convenient for handling error conditions.…Here's a working copy of hello.pl…from chapter 13 of the Exercise Files.…And just for illustration purposes,…I'm going to create a variable called condition…and assign it a true value, which, in this case,…is the integer value one.…And then, I'm going to test that condition.…And if the condition is true, it will say condition true.…
And if it is not true, we'll say condition is false.…Now, when I run this, of course it says true.…And if I change this one to a zero and run it,…it'll say false.…Now, let's say that this is a really fatal error,…and I don't want this to just end.…Here, let me go ahead down here…and put in a print statement,…after conditional.…So, we can see that when I run this,…it still continues after the conditional.…
But if I put in die instead of say,…couple of things happen.…When I run this, you'll notice that it does not print…after the conditional, and it prints the message…
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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