From 7be303feafbb5d85b3c986667a63024d5cee424d Mon Sep 17 00:00:00 2001
From: Bekzod <bekzodisakov18@gmail.com>
Date: Wed, 10 May 2023 14:17:45 +0500
Subject: [PATCH 1/4] fix error in SinglyLinkedList head method

---
 Data-Structures/Linked-List/SinglyLinkedList.js           | 2 +-
 Data-Structures/Linked-List/test/SinglyLinkedList.test.js | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/Data-Structures/Linked-List/SinglyLinkedList.js b/Data-Structures/Linked-List/SinglyLinkedList.js
index ec0e31f5fc..e0f14a39a5 100644
--- a/Data-Structures/Linked-List/SinglyLinkedList.js
+++ b/Data-Structures/Linked-List/SinglyLinkedList.js
@@ -40,7 +40,7 @@ class LinkedList {
 
   // Returns the head
   head () {
-    return this.headNode?.data || null
+    return this.headNode?.data ?? null
   }
 
   // Returns the tail
diff --git a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
index 5435553437..e446fa53fa 100644
--- a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
+++ b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
@@ -148,6 +148,9 @@ describe('SinglyLinkedList', () => {
 
     list.addFirst(30)
     expect(list.head()).toBe(30)
+
+    list.addFirst(0)
+    expect(list.head()).toBe(0)
   })
 
   it('Check tail', () => {

From 8e33642f9918cfd83db542b27f22e4d887509183 Mon Sep 17 00:00:00 2001
From: Bekzod <bekzodisakov18@gmail.com>
Date: Wed, 10 May 2023 16:08:59 +0500
Subject: [PATCH 2/4] test: update check head test for SinglyLinkedList

---
 Data-Structures/Linked-List/test/SinglyLinkedList.test.js | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
index e446fa53fa..5ac2d3b9b4 100644
--- a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
+++ b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
@@ -148,9 +148,10 @@ describe('SinglyLinkedList', () => {
 
     list.addFirst(30)
     expect(list.head()).toBe(30)
-
-    list.addFirst(0)
-    expect(list.head()).toBe(0)
+    
+    // check for a falsy head data
+    list.addFirst(false)
+    expect(list.head()).toBe(false)
   })
 
   it('Check tail', () => {

From 194e302d85be3a0cf3b5c825763343bad710d2f1 Mon Sep 17 00:00:00 2001
From: Bekzod <bekzodisakov18@gmail.com>
Date: Wed, 10 May 2023 16:16:11 +0500
Subject: [PATCH 3/4] fix: code style error

---
 Data-Structures/Linked-List/test/SinglyLinkedList.test.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
index 5ac2d3b9b4..d0681f93a5 100644
--- a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
+++ b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
@@ -148,7 +148,7 @@ describe('SinglyLinkedList', () => {
 
     list.addFirst(30)
     expect(list.head()).toBe(30)
-    
+
     // check for a falsy head data
     list.addFirst(false)
     expect(list.head()).toBe(false)

From 9ba3fba329b89ab7e8b8298d209764e4f764fe49 Mon Sep 17 00:00:00 2001
From: Bekzod <bekzodisakov18@gmail.com>
Date: Sun, 14 May 2023 16:47:44 +0500
Subject: [PATCH 4/4] fix: remove extra semicolons

---
 Data-Structures/Linked-List/SinglyLinkedList.js           | 2 +-
 Data-Structures/Linked-List/test/SinglyLinkedList.test.js | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/Data-Structures/Linked-List/SinglyLinkedList.js b/Data-Structures/Linked-List/SinglyLinkedList.js
index e0f14a39a5..b093d4bde6 100644
--- a/Data-Structures/Linked-List/SinglyLinkedList.js
+++ b/Data-Structures/Linked-List/SinglyLinkedList.js
@@ -45,7 +45,7 @@ class LinkedList {
 
   // 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 d0681f93a5..53be70884d 100644
--- a/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
+++ b/Data-Structures/Linked-List/test/SinglyLinkedList.test.js
@@ -166,6 +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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