Merging an nsarray into an nsset and avoiding duplicates in objective-c on iphone?

Your best bet is to convert the first set into a dictionary using the @"id" parameter. Here's some code that should do what you want, and it will even handle the case of having dictionaries that have no @"id" parameter (at which point they won't be merged, just included in the result).

Not entirely sure from your question (since its an iphone question, objective c notation should have been used), but it sounds like an NSDictionary could be your best friend.

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