Skip to content

Solution #1771

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
Denixify wants to merge 3 commits into
base: master
Choose a base branch
from
Open

Solution #1771

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
3 commits
Select commit Hold shift + click to select a range
3c5233f
Solution
Denixify Jun 15, 2026
7448370
Fix
Denixify Jun 15, 2026
001aac6
Fix_v2
Denixify Jun 15, 2026
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions src/index.html
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@
/>
</head>
<body>
<div id="tree"></div>
<script src="scripts/main.js"></script>
</body>
</html>
20 changes: 19 additions & 1 deletion src/scripts/main.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,7 +21,25 @@ const food = {
const tree = document.querySelector('#tree');

function createTree(element, data) {
// WRITE YOUR CODE HERE
if (!data || typeof data !== 'object') {
return;
Comment on lines +24 to +25

@mateacademy-ai-mentor mateacademy-ai-mentor Jun 15, 2026

Copy link
Copy Markdown

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

The runtime guard for data being null/undefined/non-object is in place and prevents Object.keys/iteration errors, which aligns with the checklist requirement to avoid crashes for invalid input.

}

const ul = document.createElement('ul');

for (const key in data) {
const li = document.createElement('li');

li.textContent = key;

createTree(li, data[key]);

@mateacademy-ai-mentor mateacademy-ai-mentor Jun 15, 2026

Copy link
Copy Markdown

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Your recursive call createTree(li, data[key]) correctly treats each li as the parent container for potential child lists, so nested ul elements are only added when there is deeper data, matching the desired leaf-node behavior.


ul.append(li);
}

if (ul.children.length > 0) {
element.append(ul);
Comment on lines +40 to +41

@mateacademy-ai-mentor mateacademy-ai-mentor Jun 15, 2026

Copy link
Copy Markdown

Choose a reason for hiding this comment

The reason will be displayed to describe this comment to others. Learn more.

Appending the ul only when it has children ensures you don’t create empty lists for leaf nodes; this satisfies the requirement that li elements always exist while nested ul elements are conditional on having child keys.

}
}

createTree(tree, food);
Loading