var _ = require('underscore');

function sayHello() {
  console.log('Hello, World');
}

_.times(5, sayHello);


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1 2 3
8 9 4
7 6 5

[[1 2 3] [8 9 4] [7 6 5]]
=> [1 2 3 4 15 6 7 8 9]

1 2 3 4
8 7 6 5

[[1 2 3 4] [8 7 6 5]]
=> [1 2 3 4 5 6 7 8]

[] spiralIn([][])
 */
// x*y, x, xth second row,
//  1 2 3 4
//  5 6 7 8
//  9 1 2 3
//  1 2 3 4

// var myArr = [[1, 2, 3], [8, 9, 4], [7, 6, 5]];

var myArr = [[1, 2, 3, 4], [5, 6, 7, 8], [9, 1, 2, 3,], [1,2,3,4] ];
console.log("Starting Array:");
console.log(myArr);

function spiralIn(arr, lastOutput){

  var output = lastOutput || [];
  output.push.apply(output, arr.shift());

  if(!arr.length) return output;

  arr.forEach( (item) => {
    output.push(item.pop());
  });

  output.push.apply(output, arr.pop().reverse());

  if(!arr.length) return output;

  for (var x = arr.length-1; x>=0; x--){
    output.push(arr[x].shift());
  }

  if(!arr.length) return output;

  return spiralIn(arr, output);

}

console.log("Output array:");
console.log(spiralIn(myArr));