September 2012
Beginner
744 pages
15h 48m
English
Content preview from Beginning PerlBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
Chapter 3
Variables
WHAT YOU WILL LEARN IN THIS CHAPTER:
- Understanding programming in Perl
- General things to remember as you work with variables
- Understanding scalars
- Using data in arrays and hashes
- Working with array and hash slices
- Implementing scalar and list content
- Understanding the scope of variables
- Working with strict, warnings, and diagnostics
- Using Perl’s context feature
WROX.COM CODE DOWNLOADS FOR THIS CHAPTER
The wrox.com code downloads for this chapterare found at http://www.wrox.com/WileyCDA/WroxTitle/Beginning-Perl.productCd-1118013847,descCd-DOWNLOAD.html on the Download Code tab. The code for this chapter is divided into the following major examples:
- example_3_1_variable.pl
- example_3_2_diagnostics.pl
- exercise_3_2a_array.pl
- exercise_3_2b_array.pl
- exercise_3_3_fruit.pl
- listing_3_1_scope.pl
- listing_3_2_vars.pl
- listing_3_3_our.pl
- listing_3_4_diagnostics.pl
- listing_3_5_hello.pl
This chapter examines the three primary data types of Perl: scalars, arrays, and hashes. Unlike many other languages that focus on things such as strings, integers, floats, and so on, Perl’s types focus on how you organize your data, rather than what the data is. It’s an approach to data types that is unusual to those who think of “types” as restricting data to certain values, but in practice, it’s a robust, powerful approach that many other programming languages follow.
Don’t worry about the size of this chapter because you won’t need to memorize it. Most of this information will be reinforced ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.