1 files changed, 42 insertions, 0 deletions
diff --git a/day12/day12-2.js b/day12/day12-2.js
new file mode 100644
index 0000000..51cc8a1
--- /dev/null
+++ b/day12/day12-2.js
@@ -0,0 +1,42 @@
+const data = require('./data')
+let pos = {x: 0, y: 0}
+let vp = {x: 10, y: 1}
+
+const move = (dir => {
+  const dir1 = dir.substring(0, 1)
+  const dir2 = parseInt(dir.substring(1, dir.length))
+
+  switch(dir1) {
+  case 'N': vp.y += dir2; break;
+  case 'S': vp.y -= dir2; break;
+  case 'E': vp.x += dir2; break;
+  case 'W': vp.x -= dir2; break;
+  case 'L':
+    switch(dir2%360) {
+      case 0: break
+      case 90: [vp.x, vp.y] = [-vp.y, vp.x]; break
+      case 180: [vp.x, vp.y] = [-vp.x, -vp.y]; break
+      case 270: [vp.x, vp.y] = [vp.y, -vp.x]; break
+      default: console.log('unknown value turning left', dir2);
+    }
+    break;
+  case 'R':
+    switch(dir2%360) {
+      case 0: break
+      case 90: [vp.x, vp.y] = [vp.y, -vp.x]; break
+      case 180: [vp.x, vp.y] = [-vp.x, -vp.y]; break
+      case 270: [vp.x, vp.y] = [-vp.y, vp.x]; break
+      default: console.log('unknown value turning right', dir2);
+    }
+    break;
+  case 'F':
+    pos.x += vp.x * dir2
+    pos.y += vp.y * dir2
+  break;
+  default:
+    console.log(`unknown value`);
+  }
+})
+
+data.split(/\n/g).filter(e => e).forEach(e => move(e))
+console.log(Math.abs(pos.x) + Math.abs(pos.y))