Create 1138-alphabet-board-path.js

Author: everthis

1138-alphabet-board-path.js

@@ -0,0 +1,34 @@
+/**
+ * @param {string} target
+ * @return {string}
+ */
+const alphabetBoardPath = function(target) {
+  let sx = 0,
+    sy = 0;
+  let dir = "";
+  let a = "a".charCodeAt(0);
+  for (let c of target) {
+    let dx = (c.charCodeAt(0) - a) % 5,
+      dy = ((c.charCodeAt(0) - a) / 5) >> 0,
+      n;
+    if (sx > dx) {
+      n = sx - dx;
+      while (n--) dir += "L";
+    }
+    if (sy < dy) {
+      n = dy - sy;
+      while (n--) dir += "D";
+    }
+    if (sy > dy) {
+      n = sy - dy;
+      while (n--) dir += "U";
+    }
+    if (sx < dx) {
+      n = dx - sx;
+      while (n--) dir += "R";
+    }
+    dir += "!";
+    (sx = dx), (sy = dy);
+  }
+  return dir;
+};