Subscriptable UserDefaults

#import <Foundation/Foundation.h>

@interface UserDefaults : NSObject
@end

@implementation UserDefaults : NSObject
- (id)objectForKeyedSubscript:(id)key {
    return [[NSUserDefaults standardUserDefaults] objectForKey:key];
}

- (void)setObject:(id)obj forKeyedSubscript:(id)key {
    [[NSUserDefaults standardUserDefaults] setObject:obj forKey:key];
    [[NSUserDefaults standardUserDefaults] synchronize];
}
@end

int main(void) {
    @autoreleasepool {
        UserDefaults * defaults = [UserDefaults new];
        defaults[@"x"] = @1;
        NSLog(@"%@", defaults[@"x"]);
        return 0;
    }
}