Feb 11, 2025 · In this implementation, we use a JavaScript array to simulate a queue, with push () to add elements to the end and shift () to remove elements from the front. class Queue { constructor() { this.items = []; } enqueue(element) { this.items.push(element); } dequeue() { return …

function newQueue() { return { headIdx: 0, tailIdx: 0, elts: {}, enqueue: (elt) => queue.elts[queue.tailIdx++] = elt, dequeue: => { if (queue.headIdx == queue.tailIdx) { throw new Error("Queue is empty"); } return queue.elts[queue.headIdx++]; }, size: => queue.tailIdx - queue.headIdx, isEmpty: => queue.tailIdx == queue.headIdx }; }

A queue works based on the first-in, first-out (FIFO) principle, which is different from a stack, which works based on the last-in, first-out (LIFO) principle. A queue has two main operations: Insert a new element at the end of the queue, which is called enqueue. Remove an element from the front of the queue, which is called dequeue.

Jan 13, 2022 · In this article, we will implement queue’s operations (enqueue and dequeue) using only two stacks (in the form of plain arrays) in JavaScript. Before directly jumping into understanding the problem statement let us understand briefly what exactly a stack is and also what exactly a queue is.

I have created a Queue class in javascript and I would like to store functions as data in a queue. That way I can build up requests (function calls) and respond to them when I need to (actually executing the function).

Calling queue.enqueue(7) method enqueues the item 7 into the queue. queue.dequeue() dequeues a head item from the queue, while queue.peek() just peeks the item at the head. Finally, queue.length shows how many items are still in the queue.

The enqueue() method adds elements to the queue. The dequeue() method removes the first element from the queue. The peek() method returns the first element from the queue.

Jul 8, 2020 · A standard queue has three methods: peek, enqueue, and dequeue. Our peek method will view the node that is in the front of our queue. Since in a queue we can only add items to the back, our...

May 14, 2021 · The enqueue() method takes an element as its parameter and puts it in the tail index. Once the new element is stored, you need to increment the tail pointer by one: enqueue ( element ) { this . elements [ this . tail ] = element ; this . tail ++ ; }

We learned how queues operate on the First-In, First-Out (FIFO) principle and how to implement them using JavaScript arrays. The lesson covered enqueue and dequeue operations, the isEmpty method, time and space complexity analysis for queue operations, and discussed real-world scenarios where queues are an effective data structure.