From 192c0534a62f1bb57a16a94df7daeb55cda25348 Mon Sep 17 00:00:00 2001
From: akshat <bhardwajakshat320@gmail.com>
Date: Sun, 19 Jul 2026 12:32:05 +0530
Subject: [PATCH] fix: validate negative input in factorialRecursive function

- Add input validation to throw an error for negative numbers
- Update JSDoc to document the thrown error
- Prevent incorrect behavior where negative inputs would return 1
---
 src/algorithms/math/factorial/factorialRecursive.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/algorithms/math/factorial/factorialRecursive.js b/src/algorithms/math/factorial/factorialRecursive.js
index e2b4aec6c9..c62a64f841 100644
--- a/src/algorithms/math/factorial/factorialRecursive.js
+++ b/src/algorithms/math/factorial/factorialRecursive.js
@@ -1,7 +1,11 @@
 /**
  * @param {number} number
  * @return {number}
+ * @throws {Error} Throws an error if the number is negative
  */
 export default function factorialRecursive(number) {
+  if (number < 0) {
+    throw new Error('Factorial is not defined for negative numbers');
+  }
   return number > 1 ? number * factorialRecursive(number - 1) : 1;
 }