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test_timer_chain_iter.js
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test_timer_chain_iter.js
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const WIDTH = 150;
const HEIGHT = 40;
const cells = new Map();
const directions = [
[-1, 1],
[0, 1],
[1, 1],
[-1, 0],
[1, 0],
[-1, -1],
[0, -1],
[1, -1]
];
const key_for = (x, y) => `${x}-${y}`;
for (let y = 0; y < HEIGHT; y++) {
for (let x = 0; x < WIDTH; x++) {
cells.set(key_for(x, y), {
x,
y,
alive: Math.random() <= 0.2,
next_state: false,
neighbours: []
});
}
}
for (const cell of cells.values()) {
for (const [dx, dy] of directions) {
const nx = cell.x + dx;
const ny = cell.y + dy;
if (nx < 0 || ny < 0 || nx >= WIDTH || ny >= HEIGHT) continue;
const neighbour = cells.get(key_for(nx, ny));
if (neighbour) cell.neighbours.push(neighbour);
}
}
const dotick = () => {
for (const cell of cells.values()) {
let alive_neighbours = 0;
for (const neighbour of cell.neighbours) {
if (neighbour.alive) alive_neighbours++;
}
if (!cell.alive && alive_neighbours === 3) {
cell.next_state = true;
} else if (alive_neighbours < 2 || alive_neighbours > 3) {
cell.next_state = false;
} else {
cell.next_state = cell.alive;
}
}
for (const cell of cells.values()) {
cell.alive = cell.next_state;
}
};
const render = () => {
let rendering = '';
for (let y = 0; y < HEIGHT; y++) {
for (let x = 0; x < WIDTH; x++) {
const cell = cells.get(key_for(x, y));
rendering += cell && cell.alive ? 'o' : ' ';
}
rendering += '\n';
}
return rendering;
};
let ticks = 0;
const start = performance.now();
const duration = 2000;
const batch_size = 100;
const run = () => {
for (let i = 0; i < batch_size && performance.now() - start < duration; i++) {
dotick();
render();
}
ticks += batch_size;
if (performance.now() - start >= duration) {
console.log('done', ticks);
return;
}
setTimeout(run, 0);
};
setTimeout(run, 0);

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