Thank you for your help. But why, when [true] x11 and the XOR operation, do I get the error: “expected false to equal true”? I didn't change the initial data in any way.

Can anyone explain to me why when [true, true, true], XOR = false?
This is literally:
(true XOR true) XOR true = false XOR true = true

There was indeed an error in changing the original array. I have already fixed it myself. I did not know that such an error could occur here. Thanks for your help.

And I specifically check the response in console.log before return, and it's exactly as required in the assignment

Do I understand correctly that in randomized options I should give the answer in the form of numbers and dots? Or what is the error of my variant on the left as opposed to the proposed answer on the right?
expected [ [ 'O', 'O' ], [ 'O', 'O' ], [ 'O', 'A' ], [ 'A', 'A' ], [ 'A', 'A' ], [ 'W', 'W' ], [ 'W', 'W' ], [ 'H', 'H' ], [ 'H', 'H' ], [ 'H', 'H' ] ] to deeply equal [ [ '0', '.' ], [ '8', '1' ], [ '0', '.' ], [ '8', '7' ], [ '1', '1' ], [ '0', '.' ], [ '8', '7' ], [ '0', '.' ], [ '8', '0' ], [ '.', '8' ], [ '1', '.' ], [ '3', '6' ], [ '0', '.' ], [ '8', '7' ], [ '1', '.' ], [ '3', '6' ], [ '1', '.' ], [ '3', '6' ], [ '0', '.' ], [ '8', '7' ], [ '1', '0' ], [ '.', '8' ], [ '0', '.' ], [ '8', '1' ], [ '.', '3' ], [ '6', '0' ], [ '.', '8' ], [ '7', '1' ], [ '.', '3' ], [ '6', '1' ], [ '.', '3' ] ]

In random tests on JavaScript errors in the answers.