day12

1 files changed, 36 insertions, 0 deletions

diff --git a/day12/day12-1.js b/day12/day12-1.js
new file mode 100644
index 0000000..fcac692
--- /dev/null
+++ b/day12/day12-1.js
@@ -0,0 +1,36 @@
+const data = require('./data')
+let pos = {x: 0, y: 0}
+let direction = 90
+
+const move = (dir => {
+  const dir1 = dir.substring(0, 1)
+  const dir2 = parseInt(dir.substring(1, dir.length))
+
+  switch(dir1) {
+    case 'N': pos.y += dir2; break;
+    case 'S': pos.y -= dir2; break;
+    case 'E': pos.x += dir2; break;
+    case 'W': pos.x -= dir2; break;
+    case 'L':
+      direction -= dir2
+      if (direction < 0) { direction += 360 }
+      break;
+    case 'R':
+      direction += dir2
+      if (direction >= 360) { direction -= 360 }
+      break;
+    case 'F':
+      switch(direction) {
+        case 0: pos.y += dir2; break;
+        case 90: pos.x += dir2; break;
+        case 180: pos.y -= dir2; break;
+        case 270: pos.x -= dir2; break;
+        default: console.log(`unknown direction`);
+      }
+      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))