December 2013
Beginner
576 pages
16h 4m
English
Content preview from Programming in Objective-C, Sixth Edition
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Asking Questions about Classes
As you start working with variables that can contain objects from different classes, you might need to ask questions such as the following:
Is this object a rectangle?
Does this object support a print method?
Is this object a member of the Graphics class or one of its descendants?
You can then use the answers to these questions to execute different sequences of code, avoid an error, or check the integrity of your ...
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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.