When is a value numeric?
- [Voiceover] In Perl, a numeric value is one that can be…represented as a number, and can be used…in mathematical expressions.…Here's a working copy of hello.pl…from chapter four of the exercise files.…I'll just go ahead and run it.…You see it says, hello world, and I'm gonna come in here,…and I'm going to declare a scalar variable.…My $n = 42,…so by the fact that I've assigned…a number to it, we know that this can be used…in a numeric context, and if I say…n is $n,…and I'll go ahead and run this, you see it says n is 42.…
Now, If I come up here and I say,…$n = $n x 2,…then I save and run, and you see it says n is 84,…or if I say…$n = $n + 100, and save and run.…You see it says n is 142.…On the other hand, if I say,…$n = $n, dot,…which is the string concatenation symbol,…and say, space foo, like that in single quotes.…
Then when I save and run, you see it says,…n is 42 foo,…and if I go and put some brackets around this,…you can see where the variable starts and ends in the string…Save and run, you see that, that is now being treated…
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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