In this video, you'll cover the two types of logical operators.
- [Voiceover] Logical operators are used to perform…Boolean operations on logical values.…Here's a working copy of relational.pl…from chapter eight of the exercise files.…Perl has two sets of logical operators…for two different purposes.…Low precedence logical operators are used…to bind logical expressions according to Boolean rules.…For example, we have this conditional expression here…that we used earlier in this chapter,…and if I run this you see it says false,…because a is not actually equal to b,…a is a seven, and b is 42.…
Now if I come down here…and I say if a equals b,…or rather, if a equals c,…and $b…is equal to $d,…we notice that a is equal to c,…and b is equal to d, so we should get true.…And I'll run that, and you see that the result is true.…So this and, right there, is a logical operator.…It's very low priority,…and so the expressions on either side of it…are always going to be evaluated first.…
And this makes it very useful…for this sort of usage.…Now, just so that we can look at the logical operators,…
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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