Homework Game of life - OpenProcessing

mySketch
xxxxxxxxxx
 
let columns, rows, states, cells, button;
const current = 0;
const next = 1;
const dead = 0;
const alive = 1;
let w = 6; 
let under = 2; 
let over = 4;
let rep = 3; 
​
function setup() {
  createCanvas(800, 600);
  columns = floor(width / 2);
  rows = floor(height / 2);
  states = [current, next];
  noStroke();
  frameRate(8);
  
  cells = new Array(columns);
  for (let x = 0; x < columns; x++) {
    cells[x] = new Array(rows);
  }
  for (let x = 0; x < columns; x++) {
    for (let y = 0; y < rows; y++) {
      cells[x][y] = new Array(states);
    }
  }
  init();
}
​
​
function draw() {
  let cAlive = color((255)); 
  let cDead = color("green");
  background(cDead);
  generate();
  for (let x = 0; x < columns; x++) {
    for (let y = 0; y < rows; y++) {
      if ((cells[x][y][current] == alive)) {
        fill(cAlive);
        rect(x * w, y * w, w, w);
      }
    }
  }
​
}
​
function init() {
  for (let x = 0; x < columns; x++) {
    for (let y = 0; y < rows; y++) {
      cells[x][y][current] = floor(random(2));
    }
  }
}
​
function generate() {
  for (let x = 0; x < columns; x++) {
    for (let y = 0; y < rows; y++) {
      let neighbors = cells[(x + 1) % columns][y][0] +
        cells[x][(y + 1) % rows][0] +
        cells[(x + columns - 1) % columns][y][0] +
        cells[x][(y + rows - 1) % rows][0] +
        cells[(x + 1) % columns][(y + 1) % rows][0] +
        cells[(x + columns - 1) % columns][(y + 1) % rows][0] +
        cells[(x + columns - 1) % columns][(y + rows - 1) % rows][0] +
        cells[(x + 1) % columns][(y + rows - 1) % rows][0];
      if ((cells[x][y][current] == alive) && (neighbors < under)) {
        cells[x][y][next] = dead; // underpopulation
      } else if ((cells[x][y][current] == alive) && (neighbors > over)) {
        cells[x][y][next] = dead; // overpopulation
      } else if ((cells[x][y][current] == dead) && (neighbors == rep)) {
        cells[x][y][next] = alive; // reproduction
      } else {
        cells[x][y][next] = cells[x][y][current]; // stasis
      }
    }
  }
  for (let i = 0; i < columns; i++) {
    for (let j = 0; j < rows; j++) {
      cells[i][j][current] = cells[i][j][next]
    }
  }
}