El juego de la vida

juego-de-la-vida.js

function getFactory(ls) {
  return function(x, y) {
    return Array.isArray(ls[y]) ? (ls[y][x] === undefined && [] || [ls[y][x]]) : [];
  }
}
function getNeighbors(x, y, ls){
  const get = getFactory(ls);
  return [
    get(x-1, y+1), get(x, y+1), get(x+1, y+1),
    get(x-1, y), get(x, y), get(x+1, y),
    get(x-1, y-1), get(x, y-1), get(x+1, y-1)
  ].reduce((a, b) => a.concat(b));
}

function generate(w, h){
  return Array(h).fill(0).map(_ => Array(w).fill(0));
}
function random() {
  const f = Math.floor, r = Math.random, a = arguments;
  switch(a.length){
    case 0: return f(r()); break;
    case 1: return f(r() * (a[0] + 1));break;
    case 2: return f(r() * (a[1] - a[0] + 1)) + a[0];break;
  }
};

function redraw(ls){
  const newLs = ls.map(r => [...r]);

  for (let y = 0; y < ls.length; y++) {
    for (let x = 0; x < ls[y].length; x++) {
      let isLive = !!ls[y][x];
      // en teoría aquí suma la cantidad de vecinos; aunque on lo tengo claro
      let neighborsN = getNeighbors(x, y, ls).reduce((a, b) => a + b);
      if(isLive){
        //
        if(!(neighborsN == 2 || neighborsN == 3)){
          newLs[y][x] = 0;
        }
      } else if(neighborsN === 3) {
        newLs[y][x] = 1;
      }
      
    }
  }

  return newLs;
}

let board = generate(10, 10);
// Array(5).fill(0).forEach(_ => (board[random(9)][random(9)] = 1)); // add seed

board[3][3] = 1;
board[4][3] = 1;
board[5][3] = 1;

(function run () {
  setInterval(() => {
    console.clear();
    console.log(board);
    board = redraw(board);
    run();
  }, 1500);
})();