Commit 1666c3a

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fix error in SinglyLinkedList head method (TheAlgorithms#1322)

* 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>

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Data-Structures/Linked-List
- SinglyLinkedList.js
- test
  - SinglyLinkedList.test.js

2 files changed

+10

-2

lines changed

`‎Data-Structures/Linked-List/SinglyLinkedList.js`

Lines changed: 2 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -40,12 +40,12 @@ class LinkedList {`
`40`	`40`
`41`	`41`	`// Returns the head`
`42`	`42`	`head () {`
`43`		`- return this.headNode?.data \|\| null`
	`43`	`+ return this.headNode?.data ?? null`
`44`	`44`	`}`
`45`	`45`
`46`	`46`	`// Returns the tail`
`47`	`47`	`tail () {`
`48`		`- return this.tailNode?.data \|\| null`
	`48`	`+ return this.tailNode?.data ?? null`
`49`	`49`	`}`
`50`	`50`
`51`	`51`	`// Return if the list is empty`

`‎Data-Structures/Linked-List/test/SinglyLinkedList.test.js`

Lines changed: 8 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -148,6 +148,10 @@ describe('SinglyLinkedList', () => {`
`148`	`148`
`149`	`149`	`list.addFirst(30)`
`150`	`150`	`expect(list.head()).toBe(30)`
	`151`	`+`
	`152`	`+ // check for a falsy head data`
	`153`	`+ list.addFirst(false)`
	`154`	`+ expect(list.head()).toBe(false)`
`151`	`155`	`})`
`152`	`156`
`153`	`157`	`it('Check tail', () => {`
`@@ -162,6 +166,10 @@ describe('SinglyLinkedList', () => {`
`162`	`166`
`163`	`167`	`list.addFirst(30)`
`164`	`168`	`expect(list.tail()).toBe(20)`
	`169`	`+`
	`170`	`+ // check for a falsy tail data`
	`171`	`+ list.addLast(false)`
	`172`	`+ expect(list.tail()).toBe(false)`
`165`	`173`	`})`
`166`	`174`
`167`	`175`	`it('Check size', () => {`

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Commit 1666c3a

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2 files changed

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`‎Data-Structures/Linked-List/SinglyLinkedList.js`

`‎Data-Structures/Linked-List/test/SinglyLinkedList.test.js`

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