From 18da6b79f727a5ce8f3703548345eb9d4021d5e2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?A=E3=81=95=E3=82=93?=
 <72796532+HackberryA3@users.noreply.github.com>
Date: Thu, 19 Dec 2024 17:04:27 +0900
Subject: [PATCH] feat: change canMoveForward() in Turtle (#251)

Co-authored-by: Sakamoto, Kazunori <exKAZUu@users.noreply.github.com>
---
 src/problems/traceProgram.ts | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/problems/traceProgram.ts b/src/problems/traceProgram.ts
index f103fc9..65d58e7 100644
--- a/src/problems/traceProgram.ts
+++ b/src/problems/traceProgram.ts
@@ -152,7 +152,8 @@ class Turtle {
     const index = dirs.indexOf(this.dir);
     const nx = this.x + dx[index];
     const ny = this.y + dy[index];
-    return nx >= 0 && nx < ${GRID_COLUMNS} && ny >= 0 && ny < ${GRID_ROWS};
+    const isNoTurtle = !turtles.some(t => t.x === nx && t.y === ny);
+    return nx >= 0 && nx < ${GRID_COLUMNS} && ny >= 0 && ny < ${GRID_ROWS} && isNoTurtle;
   }
   remove() {
     turtles.splice(turtles.indexOf(this), 1);