function Queue() {    var items = [];    this.enqueue = function(element){        items.push(element);    }    this.dequeue = function(){        return items.shift();    }    this.front = function(){        return items[0];    }    this.isEmpty = function(){        return items.length == 0;    }    this.clear = function(){        items = [];    }    this.size = function(){        return items.length;    }    this.print = function(){        console.log(items.toString());    }}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
     
       1){        for (var i=0; i