Question

I have an array of current animal objects that can be viewed by day – for example, monday will return all animals that are available on a monday, etc.

I also have an array of saved animal objects.

How do I ensure that the saved animals don’t show up in the current animals list?

Something like, if the currentAnimal.name isEqual to savedAnimal.name?

I need the objects in both arrays so it is important to compare the .name properties, I think?

Answer 1

Override isEqual and hash to do a comparison on the name if that is what you consider to make the objects ‘equal’.

- (BOOL)isEqual:(id)other {
    if (other == self)
        return YES;
    if (!other || ![other isKindOfClass:[self class]])
        return NO;
    return [((MyObject *)other).name isEqualToString:name];
}

and

- (NSUInteger)hash {
  return [name hash];
}