1
var projectionArea = function (grid) {
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  let maxs = new Array(grid.length).fill(0);
3

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  grid.forEach((row) =>
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    row.forEach((val, idx) => {
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      if (maxs[idx] < val) maxs[idx] = val;
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    })
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  );
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  const z = grid.reduce(
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    (prev, curr) => prev + curr.filter((val) => val !== 0).length,
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    0
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  );
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  const y = grid.reduce((prev, curr) => prev + Math.max(...curr), 0);
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  const x = maxs.reduce((prev, curr) => prev + curr, 0);
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  return x + y + z;
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};