snail sort solution for Ilya

snail.js

const snail = (arr) => {
  if (arr.length === 1) return arr[0]
  let right = arr.length - 1,
      bottom = right,
      left = 0,
      top = 1;
  const result = [arr[0][0]]
  let rowIndex = 0,
      columnIndex = 0;
  while (result.length !== arr.length * arr.length) {
    while (columnIndex < right) {
      columnIndex++;
      result.push(arr[rowIndex][columnIndex])
    }
    right--;
    while (rowIndex < bottom) {
      rowIndex++;
      result.push(arr[rowIndex][columnIndex])
    }
    bottom--;
    while (columnIndex > left) {
      columnIndex--;
      result.push(arr[rowIndex][columnIndex])
    }
    left++;
    while (rowIndex > top) {
      rowIndex--;
      result.push(arr[rowIndex][columnIndex])
    }
    top++;
  }
  return result;
}