NSPredicate is the simplest way to do it.

Given Data like this:

NSArray *theArray = @[@{@"id":1,"name":@"one"},@{@"id":2,"name":@"two"},@{@"id":3,"name":@"three"}];

NSPredicate *p = [NSPredicate predicateWithFormat:@"id = 291"]; //fiber
NSArray *matchedDicts = [theArray filteredArrayUsingPredicate:p];

There is much more to NSPredicate. I used exact matching, but matching with BEGINSWITH, CONTAINS, ENDSWITH, and LIKE. In some examples you’ll also see [c] or [cd] next to these keywords. The ‘c’ means it searches case insensitively and the ‘d’ means that an ‘o’ with an umlaut is still just an ‘o’.