let generation = 0;

let w = 10;

​

let ruleset = [1, 1, 1, 1, 0, 0, 1, 0];

// let ruleset = [0, 1, 0, 1, 1, 0, 1, 0];

// let ruleset = [1, 1, 1, 1, 0, 0, 1, 0];

​

function setup() {

  createCanvas(640, 500);

  background(255);

  cells = new Array(floor(width / w));

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

    cells[i] = 0;

  }

  cells[floor(cells.length / 2)] = 1;

}

​

function draw() {

  for (let i = 1; i < cells.length - 1; i++) {

    if (cells[i] == 1) {

      fill(0);

      square(i * w, generation * w, w);

    }

  }

​

  let nextgen = cells.slice();

  for (let i = 1; i < cells.length - 1; i++) {

    let left = cells[i - 1];

    let me = cells[i];

    let right = cells[i + 1];

    nextgen[i] = rules(left, me, right);

  }

  cells = nextgen;

  generation++;

}

​

function rules(a, b, c) {

  let s = "" + a + b + c;

  let index = parseInt(s, 2);

  return ruleset[index];

}

​