You can use the Double Brace Initialization as shown below: Map<String, Integer> hashMap = new HashMap<String, Integer>() {{ put(“One”, 1); put(“Two”, 2); put(“Three”, 3); }}; As a piece of warning, please refer to the thread Efficiency of Java “Double Brace Initialization” for the performance implications that it might have.
There is no “native” array or dictionary type in Core Data. You can store an NSArray or an NSDictionary as a transformable attribute. This will use the NSCoding to serialize the array or dictionary to an NSData attribute (and appropriately deserialize it upon access). The advantage of this approach is that it’s easy. The downside … Read more
Yes, NSDictionary supports fast enumeration. With Objective-C 2.0, you can do this: // To print out all key-value pairs in the NSDictionary myDict for(id key in myDict) NSLog(@”key=%@ value=%@”, key, [myDict objectForKey:key]); The alternate method (which you have to use if you’re targeting Mac OS X pre-10.5, but you can still use on 10.5 and … Read more
You’re using NSDictionary. Unless you explicitly need it to be that type for some reason, I recommend using a Swift dictionary. You can pass a Swift dictionary to any function expecting NSDictionary without any extra work, because Dictionary<> and NSDictionary seamlessly bridge to each other. The advantage of the native Swift way is that the … Read more
for (NSString* key in xyz) { id value = xyz[key]; // do stuff } This works for every class that conforms to the NSFastEnumeration protocol (available on 10.5+ and iOS), though NSDictionary is one of the few collections which lets you enumerate keys instead of values. I suggest you read about fast enumeration in the … Read more