January 2019
Intermediate to advanced
246 pages
5h 23m
English
Content preview from Programming CrystalBecome 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,
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Chapter 5Using Classes and Structs
If you’ve done much object-oriented development, you’re familiar with classes. You might also have noticed, though, that the details of classes vary from language to language. In this chapter, you’ll see Crystal’s specific take on classes, and you’ll learn the ins and outs of working with classes. You’ll learn how to construct a class and a struct, how to use inheritance, and how to control visibility of methods. Along the way, you’ll master syntactic details.
In object-oriented code, methods don’t stand alone most of the time: they form the action part of a class, and they’re the only way to interact with objects. You should only find out the data part of an object (its internal state) by using methods. ...
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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.