Array as a Queue

1function Queue(values){
2  if(this.values.constructor !== Array) {
3    this.values = [values];  
4  }
5  else {
6    this.values = values;     
7  }
8}
9
10Queue.prototype.next = function(){
11  return this.values.shift();
12};
13
14Queue.prototype.push = function(value){
15  return this.values.push(value);
16};
17
18const data = [1, 2, 3, 4, 5, 6];
19const q = new Queue(data);
20
21q.next();
22q.next();