From a6484203e14536daf8a31b374292393cd14a7188 Mon Sep 17 00:00:00 2001
From: Zeenat Lawal <zeenatlawal82@gmail.com>
Date: Thu, 16 Apr 2026 08:20:01 +0100
Subject: [PATCH] fix(curriculum): update recursion check to support arrow
 function syntax (#66914)

---
 .../lab-nth-fibonacci-number-js/7a97b79c096ecb000d03bd36.md    | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/curriculum/challenges/english/blocks/lab-nth-fibonacci-number-js/7a97b79c096ecb000d03bd36.md b/curriculum/challenges/english/blocks/lab-nth-fibonacci-number-js/7a97b79c096ecb000d03bd36.md
index 6ae592c4e8c..807bb0dda19 100644
--- a/curriculum/challenges/english/blocks/lab-nth-fibonacci-number-js/7a97b79c096ecb000d03bd36.md
+++ b/curriculum/challenges/english/blocks/lab-nth-fibonacci-number-js/7a97b79c096ecb000d03bd36.md
@@ -83,7 +83,8 @@ assert.equal(fibonacci(15), 610);
 You should not use recursion in your code.
 
 ```js
-const bodyMatch = __helpers.removeJSComments(code).match(/function\s+fibonacci\s*\([^)]*\)\s*\{([\s\S]*)\}/);
+const funcStr = __helpers.removeJSComments(fibonacci.toString());
+const bodyMatch = funcStr.match(/^[^{]*\{([\s\S]*)\}[^}]*$/) || funcStr.match(/=>\s*([\s\S]+)$/);
 assert(bodyMatch && !bodyMatch[1].match(/\bfibonacci\s*\(/));
 ```