Mutable Array Copy

    NSNumber *testNumber = @1;
    NSLog(@"Address: %p", testNumber);

    NSArray *testArray = @[testNumber];
    NSLog(@"Address in Array: %p", testArray.lastObject);

    NSMutableArray *testMutableArray = testArray.mutableCopy;
    NSLog(@"Address in Mutable Array: %p", testMutableArray.lastObject);