Print matrix in spiral order

spiral_matrix.js

const Direction = {
  L_R: 0,
  T_B: 1,
  R_L: 2,
  B_T: 3,
};

const spiral = (matrix) => {
  if (matrix.length === 0) {
    return;
  }
  let left = 0,
    right = matrix[0].length,
    top = 0,
    bottom = matrix.length;

  while (right > left && bottom > top) {
    // left to right - top most row
    for (let i = left; i < right; i += 1) {
      console.log(matrix[left][i]);
    }
    // shrink by top row.
    top += 1;

    // top to bottom - right most column
    for (let i = top; i < bottom; i += 1) {
      console.log(matrix[i][right - 1]);
    }
    // shrink right row;
    right -= 1;

    if (top < bottom) {
      // right to left - bottom most row
      for (let i = right - 1; i >= left; i -= 1) {
        console.log(matrix[bottom - 1][i]);
      }
      // shrink bottom row
      bottom -= 1;
    }

    if (left < right) {
      // bottom to top - left most column
      for (let i = bottom - 1; i >= top; i -= 1) {
        console.log(matrix[i][left]);
      }
      // shrink left row;
      left += 1;
    }
  }
};

const _spiral = (matrix) => {
  if (matrix.length === 0) {
    return;
  }
  let dir = Direction.L_R;
  let left = 0,
    right = matrix[0].length - 1,
    top = 0,
    bottom = matrix.length - 1;

  while (right >= left && bottom >= top) {
    // Left to right

    if (dir === Direction.L_R) {
      for (let i = left; i <= right; i += 1) {
        console.log(matrix[left][i]);
      }
      // shrink by top row.
      top += 1;
      dir = Direction.T_B;
    }
    // top to bottom
    else if (dir === Direction.T_B) {
      for (let i = top; i <= bottom; i += 1) {
        console.log(matrix[i][right]);
      }
      // shrink right row;
      right -= 1;
      dir = Direction.R_L;
    }
    // bottom to right
    else if (dir === Direction.R_L) {
      for (let i = right; i >= left; i -= 1) {
        console.log(matrix[bottom][i]);
      }
      // shrink bottom row
      bottom -= 1;
      dir = Direction.B_T;
    } else if (dir === Direction.B_T) {
      for (let i = bottom; i >= top; i -= 1) {
        console.log(matrix[i][left]);
      }
      // shrink left row;
      left += 1;
      dir = Direction.L_R;
    }
  }
};

const matrix = [
  [1, 2, 3],
  [4, 5, 6],
  [7, 8, 9],
];

spiral(matrix);