Conway's Game of Life

/* Returns the neighbors for the given cell, wrapping around to 
opposite side if at boundary */
function getNeighbors(row, col, cells) {
  const n = row > 0 ? row - 1 : cells.length - 1;
  const s = row == cells.length -1 ? 0 : row + 1;
  const e = col == cells[0].length - 1 ? 0 : col + 1;
  const w = col > 0 ? col - 1 : cells[0].length - 1;
  return [
    [n, w], [n, col], [n, e], [row, e], 
    [s, e], [s, col], [s, w], [row, w]
  ];
}