type Grid = boolean[][];
export function printGrid(grid: Grid): void {
grid.forEach(row => console.log(row.map(cell => cell ? '1' : '0').join(' ')));
console.log('\n');
}
export function countNeighbors(grid: Grid, x: number, y: number): number {
const neighborOffsets = [
[-1, -1], [-1, 0], [-1, 1],
[0, -1], [0, 1],
[1, -1], [1, 0], [1, 1]
];
return neighborOffsets.reduce((count, [dx, dy]) => {
const nx = x + dx;
const ny = y + dy;
if (nx >= 0 && ny >= 0 && nx < grid.length && ny < grid[0].length && grid[nx][ny]) {
return count + 1;
}
return count;
}, 0);
}
export function step(grid: Grid): Grid {
return grid.map((row, x) =>
row.map((cell, y) => {
const neighbors = countNeighbors(grid, x, y);
return neighbors === 3 || (neighbors === 2 && cell);
})
);
}
export function simulate(initial: Grid, steps: number): void {
let grid = initial;
for (let i = 0; i < steps; i++) {
printGrid(grid);
grid = step(grid);
}
}
const initial: Grid = [
[false, true, false],
[false, true, false],
[false, true, false]
];
const flyer: Grid = [
[false, false, false, false, false, false],
[false, false, false, false, false, false],
[false, false, false, false, false, false],
[false, false, false, true, false, false],
[false, false, false, false, true, false],
[false, false, true, true, true, false],
[false, false, false, false, false, false],
[false, false, false, false, false, false],
[false, false, false, false, false, false]
];
const toad: Grid = [
[false, false, false, false, false, false],
[false, false, false, false, false, false],
[false, false, false, true, false, false],
[false, true, false, false, true, false],
[false, true, false, false, true, false],
[false, false, true, false, false, false],
[false, false, false, false, false, false]
];
simulate(initial, 5);
simulate(flyer, 5);
simulate(toad, 5);