*

2 files changed, 98 insertions, 4 deletions

diff --git a/ts/bun/__tests__/gameOfLife.test.ts b/ts/bun/__tests__/gameOfLife.test.ts
new file mode 100644
index 0000000..1fef3de
--- /dev/null
+++ b/ts/bun/__tests__/gameOfLife.test.ts
@@ -0,0 +1,27 @@
+import { step, countNeighbors } from '../index';
+
+describe('Game of Life', () => {
+    test('countNeighbors counts the number of live neighbors', () => {
+        const grid = [
+            [false, true, false],
+            [false, true, false],
+            [false, true, false]
+        ];
+        expect(countNeighbors(grid, 1, 1)).toBe(2);
+        expect(countNeighbors(grid, 0, 0)).toBe(1);
+    });
+
+    test('step advances the game by one step', () => {
+        const initial = [
+            [false, true, false],
+            [false, true, false],
+            [false, true, false]
+        ];
+        const expected = [
+            [false, true, false],
+            [false, true, false],
+            [false, true, false]
+        ];
+        expect(step(initial)).toEqual(expected);
+    });
+});
\ No newline at end of file
diff --git a/ts/bun/index.ts b/ts/bun/index.ts
index a453244..bcde236 100644
--- a/ts/bun/index.ts
+++ b/ts/bun/index.ts
@@ -1,6 +1,73 @@
-const a = (b:string):number => {
-    console.log(b);
-    return 123;
+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);
+        })
+    );
 }
 
-console.log(a('Hello World!'));
\ No newline at end of file
+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);
\ No newline at end of file