extract property of array into new array

Question

i try to extract only the properties into an array to create a NSPredicate for this. is there a shorter way for this than creating a mutable array and looping through all objects?

NSMutableArray *extractedIDs = [NSMutableArray array];
for (SomeObject *aObject in self.addedSearchResults) {
    [addedIDs addObject:aObject.someProperty];
}

[NSPredicate predicateWithFormat:@"NOT (someOtherProperty IN %@)", addedIDs]

can't find something with google (don't really know how to search this problem)

Mark Kryzhanouski · Accepted Answer · 2013-02-19 14:20:02Z

1

KVC can help you. Just use:

NSArray* extractedIDs = [self.addedSearchResults valueForKey:@"someProperty"];

answered Feb 19, 2013 at 14:20

Mark Kryzhanouski

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Comments

Shashank · Accepted Answer · 2013-02-19 15:40:44Z

1

@Mark is right but I think you are looking for:

NSArray* extractedIDs = [self.addedSearchResults valueForKeyPath:@"nameOfSomeObject.nameOfSomeProperty"];

edited Feb 19, 2013 at 15:40

answered Feb 19, 2013 at 14:27

Shashank

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