text: // Given a N by M matrix of numbers, 
  // print out the matrix in a clockwise spiral.
  
  // For example, given the following matrix:
  
  // [[1,  2,  3,  4,  5],
  //  [6,  7,  8,  9,  10],
  //  [11, 12, 13, 14, 15],
  //  [16, 17, 18, 19, 20]]
  // You should print out the following:
  
  // 1
  // 2
  // 3
  // 4
  // 5
  // 10
  // 15
  // 20
  // 19
  // 18
  // 17
  // 16
  // 11
  // 6
  // 7
  // 8
  // 9
  // 14
  // 13
  // 12
  
  function matrixSpiral(matrix){
      //plan
      // use math to get each index after first
      // make the number that you turn at reduce after each revolution
  }
  
  let matrix1 = [
      [1,  2,  3,  4,  5],
      [6,  7,  8,  9,  10],
      [11, 12, 13, 14, 15],
      [16, 17, 18, 19, 20]
      ]
  console.log(matrixSpiral(matrix1))