Write a function that accepts a 2-dimensional array (that is, an array containing many same-length arrays), and prints out every value found, but in a spiral from the upper left in to the center.

spiralTraversal.js

var matrix =
[ [ 1, 2, 3, 4, 5 ], 
[ 6, 7, 8, 9, 10 ], 
[ 11, 12, 13, 14, 15 ], 
[ 16, 17, 18, 19, 20 ], 
[ 21, 22, 23, 24, 25 ] ];

var spiralTraversal = function(matrix){
  var results =[];
  var startRowIndex = 0;
  var endRowIndex = matrix.length-1;
  var startColIndex = 0;
  var endColIndex = matrix[0].length - 1;

  while(startRowIndex <= endRowIndex && startColIndex <= endColIndex){

    for(var i = startColIndex; i <= endColIndex; i++){
      results.push(matrix[startRowIndex][i]);
    }
    startRowIndex++;

    for(var j = startRowIndex; j <= endRowIndex; j++){
      results.push(matrix[j][endColIndex]);
    }
    endColIndex--;

    for(var k = endColIndex; k >= startColIndex; k--){
      results.push(matrix[endRowIndex][k]);
    }
    endRowIndex--;

    for(var m = endRowIndex; m >= startRowIndex; m--){
      results.push(matrix[m][startColIndex]);
    }
    startColIndex++;
  }

  return results;
}

//[ 1,2,3,4,5,10,15,20,25,24,23,22,21,16,11,6,7,8,9,14,19,18,17,12,13 ]