03-PriorityQueue.js

function PriorityQueue() {

    var items = [];

    function QueueElement (element, priority){
        this.element = element;
        this.priority = priority;
    }

    this.enqueue = function(element, priority){
        var queueElement = new QueueElement(element, priority);

        if (this.isEmpty()){
            items.push(queueElement);
        } else {
            var added = false;
            for (var i=0; i<items.length; i++){
                if (queueElement.priority < items[i].priority){
                    items.splice(i,0,queueElement);
                    added = true;
                    break;
                }
            }
            if (!added){
                items.push(queueElement);
            }
        }
    };

    this.dequeue = function(){
        return items.shift();
    };

    this.front = function(){
        return items[0];
    };

    this.isEmpty = function(){
        return items.length == 0;
    };

    this.size = function(){
        return items.length;
    };

    this. print = function(){
        for (var i=0; i<items.length; i++){
            console.log(items[i].element + ' - ' + items[i].priority);
        }
    };
}

var priorityQueue = new PriorityQueue();
priorityQueue.enqueue("John", 2);
priorityQueue.enqueue("Jack", 1);
priorityQueue.enqueue("Camila", 1);
priorityQueue.enqueue("Maxwell", 2);
priorityQueue.enqueue("Ana", 3);
priorityQueue.print();