Javascript Data Structure Queue via function

function Queue() {

    let items = [];

    this.enqueue = function(element){
        items.push(element);/*www  .ja  v  a 2s .  co m*/
    };

    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());
    };
}
let q = new Queue();
q.enqueue(1);
q.enqueue(2);
q.enqueue(3);

q.print();