const cellSize = 3;

let currentRow = 0;

​

function setup() {

  createCanvas(400, 400);

  background('black');

  const numCells = width / cellSize;

  for (let i = 0; i < numCells; i++) {

    cells[i] = round(random(0, 1));

  }

  // cells[round(numCells / 2)] = 1;

}

​

function draw() {

  fill('white');

  noStroke();

  translate(0, currentRow * cellSize);

  currentRow++;

  for (let i = 0; i < cells.length; i++) {

    if (cells[i] == 0) {

      fill('black');

    } else {

      fill('white');

    }

    rect(i * cellSize, 0, cellSize, cellSize);

  }

  let newCells = [];

  for (let i = 0; i < cells.length; i++) {

//     const leftleft = cells[i - 2] ?? 0;

//     const left = cells[i - 1] ?? 0;

//     const middle = cells[i];

//     const right = cells[i + 1] ?? 0;

//     const rightright = cells[i + 2] ?? 0;

    let sum =0;

    let nSize =2;

    for (let n = -nSize; n <= nSize; n++){

      sum = sum + (cells[i +n] ?? 0);

​

    }

    const sum = leftleft + left + middle + right + rightright;

    if (sum == 0 || sum == 3 || sum == 5) {

      newCells[i] = 1;

    } else {

      newCells[i] = 0;

    }

  }

  cells = newCells;

  if (currentRow * cellSize > height) {

    currentRow = 0;

  }

}

​

​