Copying an NSDictionary without empty values?

I'm trying to create an NSDictionary with the dictionaryWithDictionary method. However, my first NSDictionary A may have some keys with empty values. How can I create B that doesn't have any keys with empty values? I'm doing all of this for the purposes of populating a UITableView with rows that correspond to each non-empty key in the NSDictionary.


How about something like this:

NSMutableDictionary *destDictionary = [NSMutableDictionary dictionaryWithCapacity:[sourceDictionary count]];
NSEnumerator *keyEnumerator = [[sourceDictionary allKeys] objectEnumerator];
id key;
while ( key = [keyEnumerator nextObject] )
    NSString *object = [sourceDictionary objectForKey:key];
    if ([object length] == 0)
    [destDictionary setObject:object forKey:key];

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