CODEWITHSUNDEEP
iosobjective-cnsarraynsset
Rik
Rik

Reputation: 1987

NSSet with string property from array of objects

I have an array of somethings, I'd like to make a set from an NSString property on this object:

@protocol something<NSObject>

@property(nonatomic, readonly) NSString *Id;

@end

I have an array of somethings:

NSArray<id<something>> *arrayOfSomethings;

I'd like to get a NSSet of the Id properties:

NSSet<NSString *> *idSet = ?; // Calculate from arrayOfSomethings.

How do I do this? Thanks

Upvotes: 0

Views: 155

Answers (1)

Paulw11
Paulw11

Reputation: 114836

You can use valueForKey: to create an array that contains your ids and then use that to create an NSSet

NSSet<NSString *> *idSet = [NSSet setWithArray:[arrayOfSomethings valueForKey:@"id"]];

Upvotes: 1

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