Check if Matrix Is X-Matrix LeetCode solution in JavaScript

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var checkXMatrix = function (grid) {
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  for (let i = 0; i < grid.length; i++) {
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    for (let j = 0; j < grid[i].length; j++) {
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      let leftDiagonal = grid[i].length - 1;
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      if (
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        (i === j && grid[i][j] !== 0) ||
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        (j === leftDiagonal - i && grid[i][j] !== 0)
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      ) {
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        continue;
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      }
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      if (
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        (i === j && grid[i][j] === 0) ||
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        (j === leftDiagonal - i && grid[i][j] === 0)
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      ) {
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        return false;
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      }
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      if (grid[i][j] !== 0) {
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        return false;
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      }
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    }
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  }
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  return true;
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};