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fix error in SinglyLinkedList head method (#1322)

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* fix error in SinglyLinkedList head method

* test: update check head test for SinglyLinkedList

* fix: code style error

* fix: remove extra semicolons

---------

Co-authored-by: Bekzod <bekzodisakov18@gmail.com>
This commit is contained in:
BekzodIsakov
2023-05-15 13:05:09 +05:00
committed by GitHub
parent 331a4d26cf
commit 1666c3a0be
2 changed files with 10 additions and 2 deletions
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4
Data-Structures/Linked-List/SinglyLinkedList.js
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@ -40,12 +40,12 @@ class LinkedList {
// Returns the head // Returns the head
head () { head () {
return this.headNode?.data || null return this.headNode?.data ?? null
} }
// Returns the tail // Returns the tail
tail () { tail () {
return this.tailNode?.data || null return this.tailNode?.data ?? null
} }
// Return if the list is empty // Return if the list is empty

8
Data-Structures/Linked-List/test/SinglyLinkedList.test.js
View File

@ -148,6 +148,10 @@ describe('SinglyLinkedList', () => {
list.addFirst(30) list.addFirst(30)
expect(list.head()).toBe(30) expect(list.head()).toBe(30)
// check for a falsy head data
list.addFirst(false)
expect(list.head()).toBe(false)
}) })
it('Check tail', () => { it('Check tail', () => {
@ -162,6 +166,10 @@ describe('SinglyLinkedList', () => {
list.addFirst(30) list.addFirst(30)
expect(list.tail()).toBe(20) expect(list.tail()).toBe(20)
// check for a falsy tail data
list.addLast(false)
expect(list.tail()).toBe(false)
}) })
it('Check size', () => { it('Check size', () => {