Copy & MutableCopy

- (void)viewDidLoad {
    [super viewDidLoad];
    
    NSArray * arr = @[@1, @2];
    NSArray *arrCopy = [arr copy];
    NSMutableArray * arrMCopy = [arr mutableCopy];
    
    [arrMCopy addObject:@3];
    NSLog(@"%p, %p, %p", arr, arrCopy, arrMCopy);
    
    NSMutableArray * marr = [NSMutableArray arrayWithArray:arr];
    NSArray *marrCopy = [marr copy];
    NSMutableArray * marrMCopy = [marr mutableCopy];
    
    NSLog(@"%p, %p, %p", marr, marrCopy, marrMCopy);
}