diff --git a/html/images/space.svg b/html/images/space.svg
index 1efb736..bf12694 100644
--- a/html/images/space.svg
+++ b/html/images/space.svg
@@ -184,24 +184,22 @@
     }
 
     function updateBullets(elapsed) {
+      const deleteCount = 1;
+
       bullets.forEach((bullet, index) => {
-        const deleteCount = 1;
-        bullets[index].time -= elapsed;
+        bullet.time -= elapsed;
 
-        if (bullets[index].time > 0) {
-          bullets[index].y += 0.001 * elapsed * bullets[index].vy;
-          bullets[index].x += 0.001 * elapsed * bullets[index].vx;
+        if (bullet.time > 0) {
+          let y = bullet.y + 0.001 * elapsed * bullet.vy;
+          let x = bullet.x + 0.001 * elapsed * bullet.vx;
 
-          let [bx, by] = wrapPos(bullets[index].x, bullets[index].y)
-          bullets[index].x = bx;
-          bullets[index].y = by;
-          bullet.node.style.transform = `translate(${bx}px, ${by}px)`;
+          [bullet.x, bullet.y] = wrapPos(x, y);
+          bullet.node.style.transform = `translate(${bullet.x}px, ${bullet.y}px)`;
         } else {
           bullet.node.remove();
           bullets.splice(index, deleteCount);
         }
       });
-
     }
 
     function updateLines([positionX, positionY]) {
@@ -219,7 +217,6 @@
           line.setAttribute('y2', line.getAttribute('y1'));
         }
       });
-
     }
 
     requestAnimationFrame(firstFrame);
@@ -240,7 +237,7 @@
 
         info.innerText = `velocity ${velocity}\n`
           + 'bullets\nx\ty\tvx\tvy\n'
-          + bullets.map((b, index) => {
+          + bullets.map(b => {
             return `${b.x.toFixed(2)}\t${b.y.toFixed(2)}\t${b.vx.toFixed(2)}\t${b.vy.toFixed(2)}`;
           }).join("\n");