From 8d23c1e2ed7496ce35c8b70758ef6ddb5d4eeca8 Mon Sep 17 00:00:00 2001
From: Isabelle Viktoria Maciohsek <maciv@hotmail.gr>
Date: Fri, 23 Jul 2021 16:34:47 +0300
Subject: [PATCH] Update luhnCheck.md

Fixes #1817
---
 snippets/luhnCheck.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/snippets/luhnCheck.md b/snippets/luhnCheck.md
index ea4b34ba3..88bb2a30b 100644
--- a/snippets/luhnCheck.md
+++ b/snippets/luhnCheck.md
@@ -20,7 +20,7 @@ const luhnCheck = num => {
     .map(x => parseInt(x));
   let lastDigit = arr.splice(0, 1)[0];
   let sum = arr.reduce(
-    (acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val * 2) % 9) || 9),
+    (acc, val, i) => (i % 2 !== 0 ? acc + val : acc + ((val *= 2) > 9 ? val - 9 : val)),
     0
   );
   sum += lastDigit;
@@ -30,6 +30,6 @@ const luhnCheck = num => {
 
 ```js
 luhnCheck('4485275742308327'); // true
-luhnCheck(6011329933655299); //  false
+luhnCheck(6011329933655299); //  true
 luhnCheck(123456789); // false
 ```