From 6df69f525cce4b0aa3a1221fd3ca63ff794417dd Mon Sep 17 00:00:00 2001
From: Barbara Valdez <34872381+barbaravaldez@users.noreply.github.com>
Date: Fri, 16 Jul 2021 11:38:18 -0700
Subject: [PATCH] Add conditional operator before checking length (#16180)

* add optional op to sections

* remove check for undefined
---
 extensions/notebook/src/book/bookTocManager.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/extensions/notebook/src/book/bookTocManager.ts b/extensions/notebook/src/book/bookTocManager.ts
index 456f158679..547088dab0 100644
--- a/extensions/notebook/src/book/bookTocManager.ts
+++ b/extensions/notebook/src/book/bookTocManager.ts
@@ -30,7 +30,7 @@ export interface quickPickResults {
 const allowedFileExtensions: string[] = [FileExtension.Markdown, FileExtension.Notebook];
 
 export function hasSections(node: JupyterBookSection): boolean {
-	return node.sections !== undefined && node.sections.length > 0;
+	return node.sections?.length > 0;
 }
 
 export class BookTocManager implements IBookTocManager {