21.顺时针打印矩阵

题目

输入一个矩阵，按照从外向里以顺时针的顺序依次打印出每一个数字，
例如，如果输入如下4 X 4矩阵： 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 
则依次打印出数字 1,2,3,4,8,12,16,15,14,13,9,5,6,7,11,10.

code

  // [1, 2, 3, 4, 5]
  // [6, 7, 8, 9, 10]
  // [11, 12, 13, 14, 15]
  // [16, 17, 18, 19, 20]
  // -------------------
  // [1, 2]
  // [3, 4]
  // ----------------------
  // [1]
  // [2]
  // [3]

function judgeBoundary(minRow, maxRow, minCol, maxCol) {
  return maxRow >= 0 && maxCol >= 0 && maxRow >= minRow && maxCol >= minCol
}

function printMatrix(matrix) {
  if (matrix.length < 1) return []
  if (matrix.length === 1) return matrix[0]

  var maxRow = matrix.length - 1
  var minRow = 0
  var maxCol = matrix[0].length - 1
  var minCol = 0
  var res = []
  while (judgeBoundary(minRow, maxRow, minCol, maxCol)) {
    for (var j = minCol; judgeBoundary(minRow, maxRow, minCol, maxCol) && j <= maxCol; j++) {
      res.push(matrix[minRow][j])
    }
    minRow++
    for (var j = minRow; judgeBoundary(minRow, maxRow, minCol, maxCol) && j <= maxRow; j++) {
      res.push(matrix[j][maxCol])
    }
    maxCol--
    for (var j = maxCol; judgeBoundary(minRow, maxRow, minCol, maxCol) && j >= minCol; j--) {
      res.push(matrix[maxRow][j])
    }
    maxRow--
    for (var j = maxRow; judgeBoundary(minRow, maxRow, minCol, maxCol) && j >= minRow; j--) {
      res.push(matrix[j][minCol])
    }
    minCol++
  }
  return res
}