Game of life which runs in a browser console

game_of_life.js

const console_render = (state) => console.log(state.map(row => row.map(v => '☐◼'[v]).join("")).join("\n"));
function game_of_life(w, h, fps, render = console_render) {
    const state = (w, h) => Array(w).fill(0).map(() => Array(h).fill(0));
    const randomize = (state) => state.map(a => a.map(b => Math.round(Math.random())));
    const neighbours = (state, x, y) => [
        state[x-1]?.[y-1], state[x]?.[y-1], state[x+1]?.[y-1],
        state[x-1]?.[y  ],                  state[x+1]?.[y  ],
        state[x-1]?.[y+1], state[x]?.[y+1], state[x+1]?.[y+1]
    ].map(v => v ?? 0);
    const step = (state) => state.map((r, x) => r.map((v, y) => {
        const n = neighbours(state, x, y).reduce((t, v) => t + v);
        return (v && (n === 2 || n === 3)) || n === 3 ? 1 : 0;
    }));
    const done = (p, c) => (p = p.flat(Infinity), c = c.flat(Infinity), !p.map((v, i) => c[i] === v).some(v => !v));
    const delay = (ms) => new Promise(r => setTimeout(r, ms));

    let board = randomize(state(h, w));
    let prev = null;
    const loop = () => {
        render(board);
        prev = board;
        board = step(board);
        if (!done(prev, board))
            delay(1000/fps).then(() => requestAnimationFrame(loop));
    };
    requestAnimationFrame(loop);
};
game_of_life(40, 20, 2);