Spiral

'use strict';

function main(matrix, row) {
  //Create an empty matrix
  let spiralArray = createArray(matrix, row);

  let top = 0;
  let bottom = matrix - 1;
  let left = 0;
  let right = row - 1;

  let number = 0;
  while (top <= bottom && left <= right) {

    for (let i = left; i <= right; i++) {
      spiralArray[top][i] = ++number;
    }

    top++;

    for (let j = top; j <= bottom; j++) {
      spiralArray[j][right] = ++number;
    }

    right--;

    for (let k = right; k >= left; k--) {
      spiralArray[bottom][k] = ++number;
    }

    bottom--;

    for (let l = bottom; l >= top; l--) {
      spiralArray[l][left] = ++number;
    }

    left++;
  }
  return spiralArray;

  //Declaration
  function createArray(matrix, row) {
    let array = [];

    for (let i = 0; i < matrix; i++) {
      let subArray = [];
      subArray.length = row;
      array.push(subArray);
    }
    return array;
  }
}

let result = main(5, 5);
console.log(result);