Commit beb8501

m-maksyutintrekhleb

authored and

committed

Fix the prepend method for the LinkedList (trekhleb#47)

* Fix LinkedList * Fix the prepend method for the LinkedList

1 parent 91d4714 commit beb8501Copy full SHA for beb8501

File tree

+13

-3

lines changed

src/data-structures/linked-list
- LinkedList.js
- __test__
  - LinkedList.test.js

+13

-3

lines changed

Lines changed: 7 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -21,7 +21,13 @@ export default class LinkedList {`
`21`	`21`	`*/`
`22`	`22`	`prepend(value) {`
`23`	`23`	`// Make new node to be a head.`
`24`		`- this.head = new LinkedListNode(value, this.head);`
	`24`	`+ const newNode = new LinkedListNode(value, this.head);`
	`25`	`+ this.head = newNode;`
	`26`	`+`
	`27`	`+ // If there is no tail yet let's make new node a tail.`
	`28`	`+ if (!this.tail) {`
	`29`	`+ this.tail = newNode;`
	`30`	`+ }`
`25`	`31`
`26`	`32`	`return this;`
`27`	`33`	`}`

Lines changed: 6 additions & 2 deletions

Original file line number	Diff line number	Diff line change
`@@ -21,10 +21,14 @@ describe('LinkedList', () => {`
`21`	`21`	`it('should prepend node to linked list', () => {`
`22`	`22`	`const linkedList = new LinkedList();`
`23`	`23`
`24`		`- linkedList.append(1);`
`25`	`24`	`linkedList.prepend(2);`
	`25`	`+ expect(linkedList.head.toString()).toBe('2');`
	`26`	`+ expect(linkedList.tail.toString()).toBe('2');`
	`27`	`+`
	`28`	`+ linkedList.append(1);`
	`29`	`+ linkedList.prepend(3);`
`26`	`30`
`27`		`- expect(linkedList.toString()).toBe('2,1');`
	`31`	`+ expect(linkedList.toString()).toBe('3,2,1');`
`28`	`32`	`});`
`29`	`33`
`30`	`34`	`it('should delete node by value from linked list', () => {`

Comments

(0)