Filtering an NSArray with custom objects

This question already has an answer here:

How do I sort an NSMutableArray with custom objects in it? 25 answers

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Something along these lines should do the trick:

NSMutableSet * types = [NSMutableSet setWithCapacity:10];
NSPredicate * filterPredicate = [NSPredicate predicateWithBlock:^BOOL(id evaluatedObject, NSDictionary *bindings) {

    if ([types containsObject:[evaluatedObject type]]) {
        return NO;
    }
    else {
        [types addObject:[evaluatedObject type]];
        return YES
    }
}];
NSArray * filteredArray = [detailedError filteredArrayUsingPredicate:filterPredicate];

The above code keeps the first object of each type and removes others.

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I would do this by just overriding hash and isEqual:

- (BOOL) isEqual:(id)object
{
    if([object isKindOfClass: [self class]])
        return [_type isEqualToString: object];
    return NO;
}

- (NSInteger) hash
{
    return [_type hash];
}

Then taking the distinct objects array from a set created from the array:

NSArray* filteredArray= [NSSet setWithArray: array].allObjects;

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