Fast NSDictionary traversal in Objective-C

    @interface NSDictionary (objectForKeyList)
    - (id)objectForKeyList:(id)key, ...;
    @end

    @implementation NSDictionary (objectForKeyList)

    - (id)objectForKeyList:(id)key, ...
    {
        id object = self;
        va_list ap;
        va_start(ap, key);
        for ( ; key; key = va_arg(ap, id))
            object = [object objectForKey:key];
        va_end(ap);
        return object;
    }

    @end

I think the category approach is much better (cleaner, easier documented, conventional) and there really isn't a speed increase in using the preprocessor (anything that looks like a difference in time is due to either caching or CPU load at the time).