Game of life + file lister

JavaScript/Game Of Life/index.js

@@ -0,0 +1,86 @@
+/*
+    Author(s): Ben (plane000)#8618
+    Created: 25/06/2018
+    Last Updated: 25/06/2018
+    Last Updated by: Ben (plane000)#8618
+*/
+
+let c = document.getElementById("canv");
+let ctx = c.getContext("2d");
+
+let canvasSize = 400;
+let gridSize = 40;
+let grid = makeGridArr(gridSize); //0 = dead, 1 = alive
+let next;
+
+for (let i = 0; i < gridSize; i++) {
+    for (let j = 1; j < gridSize; j++) {
+        grid[i][j] = Math.round(Math.random());
+    }
+}
+
+async function gameLoop() {
+    next = makeGridArr(gridSize);
+    update();
+    draw();
+}
+
+function update() {
+    for (let i = 0; i < gridSize; i++) {
+        for (let j = 0; j < gridSize; j++) {
+            let state = grid[i][j];
+        
+            let neighbors = countNeighbors(grid, i, j)
+
+            if (state == 0 && neighbors == 3) {
+                next[i][j] = 1;
+            } else if (state == 1 && (neighbors < 2 || neighbors > 3)) {
+                next[i][j] = 0;
+            } else {
+                next[i][j] = state;
+            }
+        }
+    }
+    grid = next;
+}
+
+function countNeighbors(arr, x, y) {
+    let sum = 0;
+    for (let i = -1; i < 2; i++) {
+      for (let j = -1; j < 2; j++) {
+        sum += arr[(x + i + gridSize) % gridSize] [(y + j + gridSize) % gridSize];
+      }
+    }
+    sum -= arr[x][y];
+    return sum;
+}
+
+function makeGridArr(size) {
+    arr = [];
+    for (let i = 0; i < size; i++) {
+        arr[i] = [];
+        for (let j = 0; j < size; j++) {
+            arr[i][j] = 0;
+        }
+    }
+    return arr;
+}
+
+function draw () {
+    ctx.fillStyle = "#FFFFFF";
+    ctx.fillRect(0, 0, canvasSize, canvasSize);
+
+    for (let i = 0; i < gridSize; i++) {
+        for (let j = 0; j < gridSize; j++) {
+            if (grid[i][j] == 0) {
+                ctx.fillStyle = "#FFFFFF";
+            } else {
+                ctx.fillStyle = "#000000";
+            }
+            
+            ctx.fillRect(i * 10, j * 10, canvasSize / gridSize, canvasSize / gridSize);
+        }
+    }
+}
+
+setInterval(gameLoop, 100);