From 10b8256ec0277cda85b989c42a8d44a56bdd7afc Mon Sep 17 00:00:00 2001
From: Caio Bittencourt <caiolucasbittencourt@hotmail.com>
Date: Mon, 4 May 2026 08:24:37 -0300
Subject: [PATCH] fix(curriculum): relax step 18 unknown key checks (#67130)

Co-authored-by: Huyen Nguyen <25715018+huyenltnguyen@users.noreply.github.com>
---
 .../69a9de82b435a1310aff57c2.md                 | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/curriculum/challenges/english/blocks/workshop-heritage-library-catalog/69a9de82b435a1310aff57c2.md b/curriculum/challenges/english/blocks/workshop-heritage-library-catalog/69a9de82b435a1310aff57c2.md
index 4e19130c97d..100a8a6e7d0 100644
--- a/curriculum/challenges/english/blocks/workshop-heritage-library-catalog/69a9de82b435a1310aff57c2.md
+++ b/curriculum/challenges/english/blocks/workshop-heritage-library-catalog/69a9de82b435a1310aff57c2.md
@@ -18,20 +18,29 @@ Finally, use `continue` to skip the rest of the loop body. The `continue` statem
 You should check if `book.year` is equal to `"Unknown"`.
 
 ```js
-assert.match(groupByDecade.toString(), /book\.year\s*===?\s*"Unknown"/);
+assert.match(groupByDecade.toString(), /book\.year\s*===?\s*("|')Unknown\1/);
 ```
 
 You should check if `grouped["Unknown"]` doesn't exist yet and initialize it as an empty array.
 
 ```js
-assert.match(groupByDecade.toString(), /!\s*grouped\s*\[\s*"Unknown"\s*\]/);
-assert.match(groupByDecade.toString(), /grouped\s*\[\s*"Unknown"\s*\]\s*=\s*\[\s*\]/);
+const code = groupByDecade.toString();
+const existenceChecks = [
+  /!\s*grouped\s*\[\s*("|')Unknown\1\s*\]/,
+  /!\s*Object\.hasOwn\s*\(\s*grouped\s*,\s*("|')Unknown\1\s*\)/,
+  /!\s*grouped\s*\.hasOwnProperty\s*\(\s*("|')Unknown\1\s*\)/,
+  /grouped\s*\[\s*("|')Unknown\1\s*\]\s*===?\s*undefined/,
+  /!\s*\(\s*("|')Unknown\1\s*in\s*grouped\s*\)/,
+];
+
+assert.isTrue(existenceChecks.some(re => re.test(code)));
+assert.match(code, /grouped\s*\[\s*("|')Unknown\1\s*\]\s*=\s*\[\s*\]/);
 ```
 
 You should push `book` into `grouped["Unknown"]`.
 
 ```js
-assert.match(groupByDecade.toString(), /grouped\s*\[\s*"Unknown"\s*\]\s*\.push\s*\(\s*book\s*\)/);
+assert.match(groupByDecade.toString(), /grouped\s*\[\s*("|')Unknown\1\s*\]\s*\.push\s*\(\s*book\s*\)/);
 ```
 
 You should use `continue` to skip to the next iteration after handling an unknown year.