Mark visited gray squares with "*"

1 files changed, 6 insertions, 0 deletions

diff --git a/lib/Octans/Puzzle.rakumod b/lib/Octans/Puzzle.rakumod
index 731cc8e..e88a74a 100644
--- a/lib/Octans/Puzzle.rakumod
+++ b/lib/Octans/Puzzle.rakumod
@@ -17,4 +17,10 @@ class Puzzle is export {
 
     # Accessor for @!gray-squares.
     method gray-squares() { @!gray-squares; }
+
+    # Given $y, $x where $y is row index & $x is column index,
+    # is-gray-square returns if the cell is a gray square.
+    method is-gray-square(Int $y, Int $x) {
+        return so @!gray-squares.grep(($y, $x));
+    }
 }