Find Kth Largest XOR Coordinate Value LeetCode solution in JavaScript

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var kthLargestValue = function (M, K) {
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  let y = M.length,
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    x = M[0].length,
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    ans = new Uint32Array(x * y),
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    h = 0;
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  for (let i = 0; i < y; i++)
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    for (let j = 0; j < x; j++) {
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      let cell = M[i][j];
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      if (i > 0) cell ^= M[i - 1][j];
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      if (j > 0) cell ^= M[i][j - 1];
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      if (i > 0 && j > 0) cell ^= M[i - 1][j - 1];
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      ans[h++] = M[i][j] = cell;
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    }
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  return ans.sort()[x * y - K];
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};