Look and Write Sequence

69138048ff69ef74385d5941/index.js

@@ -0,0 +1,92 @@
+
+// Look and Write Sequence
+
+function mazeRunner(maze, directions) {
+  const [h, w] = [maze.length, maze[0].length];
+  const findStartingPos = () => {
+    for (let y = 0; y < h; ++y) {
+      for (let x = 0; x < w; ++x) {
+        if (maze[y][x] === 2) return [x, y];
+      }
+    }
+  };
+  const X = 0;
+  const Y = 1;
+  const pos = findStartingPos();
+  const dir2coord = {
+    N: [0, -1],
+    S: [0, 1],
+    E: [1, 0],
+    W: [-1, 0],
+  };
+  for (dir of directions) {
+    const coord = dir2coord[dir];
+    pos[X] += coord[X];
+    pos[Y] += coord[Y];
+    if (pos[X] < 0 || pos[X] >= w) return 'Dead';
+    if (pos[Y] < 0 || pos[Y] >= h) return 'Dead';
+    if (maze[pos[Y]][pos[X]] === 1) return 'Dead';
+    if (maze[pos[Y]][pos[X]] === 3) return 'Finish';
+  }
+  return 'Lost';
+}
+
+var maze = [[1,1,1,1,1,1,1],
+            [1,0,0,0,0,0,3],
+            [1,0,1,0,1,0,1],
+            [0,0,1,0,0,0,1],
+            [1,0,1,0,1,0,1],
+            [1,0,0,0,0,0,1],
+            [1,2,1,0,1,0,1]];
+            
+mazeRunner(maze,["N","N","N","N","N","E","E","E","E","E"]); // "Finish"
+mazeRunner(maze,["N","N","N","N","N","E","E","S","S","E","E","N","N","E"]); // "Finish"
+mazeRunner(maze,["N","N","N","N","N","E","E","E","E","E","W","W"]); // "Finish"
+
+mazeRunner(maze,["N","N","N","W","W"]); // "Dead"
+mazeRunner(maze,["N","N","N","N","N","E","E","S","S","S","S","S","S"]); // "Dead"
+
+mazeRunner(maze,["N","E","E","E","E"]); // "Lost"
+
+mazeRunner([
+  [
+    1, 1, 1, 1, 1,
+    1, 1, 1, 0, 1
+  ],
+  [
+    1, 3, 1, 0, 1,
+    0, 0, 0, 0, 1
+  ],
+  [
+    1, 0, 1, 0, 0,
+    0, 1, 1, 0, 1
+  ],
+  [
+    1, 0, 1, 1, 1,
+    1, 1, 0, 0, 1
+  ],
+  [
+    1, 0, 1, 0, 0,
+    0, 0, 0, 0, 1
+  ],
+  [
+    1, 0, 1, 0, 1,
+    0, 1, 0, 0, 1
+  ],
+  [
+    1, 0, 1, 0, 1,
+    0, 0, 0, 0, 0
+  ],
+  [
+    1, 0, 1, 0, 1,
+    0, 1, 1, 0, 1
+  ],
+  [
+    1, 0, 0, 0, 1,
+    0, 0, 0, 0, 1
+  ],
+  [
+    1, 1, 1, 0, 1,
+    1, 1, 1, 2, 1
+  ]
+], [ 'N', 'W', 'W', 'W', 'W' ]);