Path Finder #1: can you reach the exit?

path-finder-number-1-can-you-reach-the-exit/index.js

@@ -0,0 +1,22 @@
+// https://www.codewars.com/kata/path-finder-number-1-can-you-reach-the-exit/train/javascript
+
+function pathFinder(maze) {
+  let m = maze.split(/\n/).map(row=>row.split``);
+  let h = m.length;
+  let w = m[0].length;
+  let mark = (xx, yy) => {
+    [[1, 0], [-1, 0], [0, 1], [0, -1], [0, 0]].map(p => {
+      let [x, y] = [p[0]+xx, p[1]+yy];
+      if (0 <= x && x < w) {
+        if (0 <= y && y < h) {
+          if (m[y][x] === '.') {
+            m[y][x] = '#';
+            mark(x, y);
+          }
+        }
+      }
+    });
+  };
+  mark(0, 0);
+  return m[h-1][w-1] !== '.';
+}