November 2011
Intermediate to advanced
528 pages
10h 14m
English
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Chapter 29. Blocks
Let’s pretend that we’re writing a zombie game. Specifically, we’re working on the zombie AI code. We want a method on our Zombie object to find nearby brains. So we start with this:
@implementation Zombie- (NSArray *)brainsForFlags:(NSInteger)flags{ return [[self game] allBrains];}@end
It’s a good start, but it would be a lot more useful it if returned the brains in order of proximity to the zombie, that is, sorted by the distance between the zombie and the brain. The zombie is hungry, after all. NSArray’s sortedArrayUsingSelector: is usually a great first choice for sorting. It calls the given selector on the objects in the array in order to compare them with their neighbors. For example, NSString provides a compare:
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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.