Subscripts with NSDictionary

Subscripts can also be used with NSDictionary and NSMutableDictionary. The following code:

NSMutableDictionary *myDictionary = [@{@"Foo": @"Bar"} mutableCopy];
[myDictionary setObject:@"Baz" forKey:@"Foo"];
NSLog(@"%@", [myDictionary objectForKey:@"Foo"]); // Baz

Can be shortened to:

NSMutableDictionary *myDictionary = [@{@"Foo": @"Bar"} mutableCopy];
myDictionary[@"Foo"] = @"Baz";
NSLog(@"%@", myDictionary[@"Foo"]); // Baz

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