Discover simple loops with while and until.
- [Voiceover] The while loop is the simplest form of loop.…Here's a working copy of while.pl…from Chapter 6 of the exercise files.…In this case, the while loop is very simple.…The while keyword is followed by a logical condition…in parentheses, which is followed by a block of code,…which is the body of the loop.…The condition is evaluated and if it's True,…the body of the loop is executed,…and once the body has run, the condition is evaluated again,…and if it's still True, the body is executed again.…This continues until the condition evaluates to False.…
In this case, we have an array here with five elements…using the quote words operator.…I've initialized the array with five strings,…to the words one, two, three, four, and five,…and then the condition of the while loop is the array.…In logical context, the array evaluates True…when the array is not empty,…and it evaluates False when the array is empty.…So each time through the loop,…one element of the array is removed…with the shift function there on line 10,…
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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