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Commit cbe4a1e

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committed
update: implemented Queue using SLL
1 parent 63ac632 commit cbe4a1e

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2 files changed

+66
-9
lines changed

2 files changed

+66
-9
lines changed
Lines changed: 20 additions & 0 deletions
Original file line numberDiff line numberDiff line change
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class Queue {
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constructor() {
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this.data = [];
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}
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add(element) {
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// add element to the start of the data
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return this.data.unshift(element);
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}
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peek() {
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return this.data[this.data.length - 1];
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}
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remove() {
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return this.data.pop();
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}
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}
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module.exports = Queue;

‎src/_DataStructures_/Queue/index.js‎

Lines changed: 46 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -1,20 +1,57 @@
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class Queue {
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const { LinkedList: SinglyLinkedLists, Node } = require('../LinkedList');
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class Queue extends SinglyLinkedLists {
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constructor() {
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this.data = [];
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super();
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this.NotAllowed = 'Not Allowed';
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}
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enqueue(data) {
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const node = new Node(data, null);
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return this.addAtEnd(node);
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}
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add(element) {
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// add element to the start of the data
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return this.data.unshift(element);
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dequeue() {
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constnode=this.removeFromBeginning();
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return node.data;
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}
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peek() {
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return this.data[this.data.length - 1];
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return this.getLast();
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}
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size() {
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return this.length();
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}
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destroy() {
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this.delete();
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}
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/** Override and throw error for other LL methods */
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addAtBeginning() {
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throw new Error(this.NotAllowed);
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}
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addAt() {
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throw new Error(this.NotAllowed);
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}
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removeFromEnd() {
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throw new Error(this.NotAllowed);
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}
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getFirst() {
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throw new Error(this.NotAllowed);
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}
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getAt() {
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throw new Error(this.NotAllowed);
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}
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remove() {
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returnthis.data.pop();
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removeAt() {
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thrownewError(this.NotAllowed);
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}
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}
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20-
module.exports = Queue;
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module.exports = Queue;

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