
Ryan Jin
15,337 PointsHow can if operation work with nonboolean
In this video, there is this piece of code.
-(id)init {
self = [super init];
NSLog(@"%@\n", self);
if (self) {
self.itemsOrdered = [[NSMutableArray alloc]init];
}
return self;
}
I am wondering how can if statement be used to compare a self. Is it checking to see if self is nill or not, or is self a boolean type. I have printed it to the console, and it is not a boolean.
1 Answer

jcorum
71,755 PointsIt's shorthand for a boolean: self != nil.
Here's a great article on the subject: https://www.mikeash.com/pyblog/the-how-and-why-of-cocoa-initializers.html