parrot-queue

parrot-queue

An efficient queue in JavaScript. Note that using native arrays as a queue leads to O(n) runtime complexity for dequeuing, because shift takes O(n) in the worst case.

Usage

const ParrotQueue = require("parrot-queue");

const cinemaQueue = ParrotQueue();
cinemaQueue.enqueue('Clara');
cinemaQueue.enqueue('Peter');
cinemaQueue.enqueue('Lisa');
cinemaQueue.enqueue('John');

console.log(cinemaQueue.size()) // "4"

console.log(cinemaQueue.peek()) // "Clara"
console.log(cinemaQueue.dequeue()) // "Clara"
console.log(cinemaQueue.dequeue()) // "Peter"
console.log(cinemaQueue.dequeue()) // "Lisa"
console.log(cinemaQueue.size()) // "1"

Methods

• enqueue(object: any): void Adds an object to the queue
• size(): number Returns the size of the queue
• peek(): any Return most recently added element
• dequeue(): any Return most recently added element and delete it from the queue

Runtime complexity

• enqueue: O(1)
• size: O(1)
• dequeue: O(1)
• peek: O(1)