diff --git a/Data-Structures/Linked-List/SinglyLinkedList.js b/Data-Structures/Linked-List/SinglyLinkedList.js
index ec0e31f5fc..b093d4bde6 100644
--- a/Data-Structures/Linked-List/SinglyLinkedList.js
+++ b/Data-Structures/Linked-List/SinglyLinkedList.js
@@ -40,12 +40,12 @@ class LinkedList {
// Returns the head
head () {
- return this.headNode?.data || null
+ return this.headNode?.data ?? null
}
// Returns the tail
tail () {
- return this.tailNode?.data || null
+ return this.tailNode?.data ?? null
}
// Return if the list is empty
diff --git a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
index 5435553437..53be70884d 100644
--- a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
+++ b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
@@ -148,6 +148,10 @@ describe('SinglyLinkedList', () => {
list.addFirst(30)
expect(list.head()).toBe(30)
+
+ // check for a falsy head data
+ list.addFirst(false)
+ expect(list.head()).toBe(false)
})
it('Check tail', () => {
@@ -162,6 +166,10 @@ describe('SinglyLinkedList', () => {
list.addFirst(30)
expect(list.tail()).toBe(20)
+
+ // check for a falsy tail data
+ list.addLast(false)
+ expect(list.tail()).toBe(false)
})
it('Check size', () => {
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