simple queue data structure

queue.js

var queue = new (function(undefined){
        var _q = [], _size = 0;

        this.push = function(task) {
            _q.push(task);
            _size++;
            return task;
        };

        this.next = function() {
            _size--;
            return _q.shift();
        };

        this.peek = function() {
            return _q[0] || undefined;
        };

        this.getLength = function() {
            return _size;
        };
    })();