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set tail as newNode if currentNode is the tail #1020

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set tail as newNode if currentNode is the tail #1020

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019c07e
set tail as newNode if currentNode is the tail
xyn22 Apr 8, 2023
dfdb6ec
test adjusting tail after insert at tail position
xyn22 Apr 8, 2023
a03f492
maintain current test coverage
xyn22 Apr 8, 2023
87c1dde
separate test for offset-based insert
xyn22 Apr 8, 2023
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3 changes: 3 additions & 0 deletions src/data-structures/linked-list/LinkedList.js
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Original file line number Diff line number Diff line change
Expand Up @@ -75,6 +75,9 @@ export default class LinkedList {
if (currentNode) {
newNode.next = currentNode.next;
currentNode.next = newNode;
if (this.tail === currentNode) {
this.tail = newNode;
}
} else {
if (this.tail) {
this.tail.next = newNode;
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12 changes: 12 additions & 0 deletions src/data-structures/linked-list/__test__/LinkedList.test.js
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Expand Up @@ -47,6 +47,18 @@ describe('LinkedList', () => {
expect(linkedList.toString()).toBe('1,4,2,3,10');
});

it('should insert and maintain head and tail', () => {
const linkedList = new LinkedList();

linkedList.insert(2, 0);
linkedList.insert(3, 1);
linkedList.insert(4, 2);

expect(linkedList.toString()).toBe('2,3,4');
expect(linkedList.head.toString()).toBe('2');
expect(linkedList.tail.toString()).toBe('4');
});

it('should delete node by value from linked list', () => {
const linkedList = new LinkedList();

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