Sorry, I totally forgot about "shift" parameter. :( So there was a problem with initial shift - it was always 1.
BTW, I can't see "spoiler" comments until I solve the puzzle... :) But thanks anyway!

Yes, there is a space. Space is 1st symbol. Second - "u". So, shift for "u" must be 2, "u"+2="w", not "x", isn't it? Or I misunderstood something?

There is a space before 'u', isn'it? BTW put an issue when there is an error in the kata, not an error in your code. The tests are the same in all languages and 323 guys passed the kata so the chance that there is an error in the kata is rather low:-)

Awesome! Thanks Giacomo! Appreciate all your hard work!

It works fine now. Thanks! :)

Renewed the JS tests: care to test now :)?

If so, case insensitivity must be explicitly mentioned in kata details, I think. Or at least it must be clear after looking at test cases.
I.e. Test.assertEquals(validateHello('Halloween'), true);

So, there are 13 'O', 22 'A', 23 'W', 24 'H' in the input data, but 15 'O', 26 'A', 29 'W', 25 'H' in expected result. I don't get it... Maybe I misunderstood something? This is JavaScript version.

Input: [ [ 'A', 'H', 'O', 'H', undefined, 'A', 'H', 'A', 'W', undefined ],
[ 'A', 'W', 'H', 'A', 'O', 'A', 'W', 'H', 'W', 'O' ],
[ 'W', 'W', undefined, 'W', 'H', undefined, 'A', 'H', 'W', 'H' ],
[ 'W', undefined, 'O', 'W', undefined, 'A', 'W', 'A', 'A', 'H' ],
[ 'W', 'H', 'O', undefined, 'H', undefined, 'H', 'H', 'O', 'A' ],
[ 'O', undefined, 'H', 'H', 'W', 'A', 'H', undefined, 'A', undefined ],
[ 'O', 'H', 'W', 'A', 'O', 'A', 'H', 'H', 'W', 'A' ],
[ 'A', 'O', undefined, 'H', undefined, 'O', 'H', 'W', 'A', 'H' ],
[ 'H', 'W', 'A', undefined, 'W', 'A', 'W', 'W', 'O', 'O' ],
[ 'A','W',undefined,undefined,'W','H','W',undefined,undefined,'A' ] ]

Expected: [["O","O","O","O","O","O","O","O","O","O"],
["O","O","O","O","O","A","A","A","A","A"],
["A","A","A","A","A","A","A","A","A","A"],
["A","A","A","A","A","A","A","A","A","A"],
["A","W","W","W","W","W","W","W","W","W"],
["W","W","W","W","W","W","W","W","W","W"],
["W","W","W","W","W","W","W","W","W","W"],
["H","H","H","H","H","H","H","H","H","H"],
["H","H","H","H","H","H","H","H","H","H"],
["H","H","H","H","H"]],

instead got: [["O","O","O","O","O","O","O","O","O","O"],
["O","O","O","A","A","A","A","A","A","A"],
["A","A","A","A","A","A","A","A","A","A"],
["A","A","A","A","A","W","W","W","W","W"],
["W","W","W","W","W","W","W","W","W","W"],
["W","W","W","W","W","W","W","W","H","H"],
["H","H","H","H","H","H","H","H","H","H"],
["H","H","H","H","H","H","H","H","H","H"],
["H","H"],
[]]