Discover how to use the compound assignment operators.
- [Voiceover] The compound assignment operators…are a nice convenience feature that was borrowed…from the C language.…Here is a working copy of hello.pl…from chapter eight of the exercise files.…For example, if I come down here and I create a variable,…and assign it a value,…so I now I've got $x is equal to seven.…And let's say that I want to add two to this.…I could say, $x equals $x plus two,…and say $x, and I'll get nine, and that's correct.…
Or I could use the compound assignment operator,…I can take this assignment and the addition…and put them in one operator,…and say, plus equals, x plus equals two.…And you notice I get exactly the same result.…So this both adds and assigns in one operator.…So that's why it's called the compound assignment operator.…It has the side effect of only evaluating $x once,…and there are circumstances where that may matter.…In other words, if I were doing this in two steps like this,…it actually evaluates $x twice.…
And if that were a class or something…that evaluating it actually changes it in some way…
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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