Implementing queue

// getBuffer(): 객체 내 데이터 셋 반환
Queue.prototype.getBuffer = function () {
    return this.array.slice();
};

Queue.prototype.enqueue = function (element) {
    return (this.array[this.tail++] = element);
};
Queue.prototype.dequeue = function () {
    if (this.tail === this.head) return undefined;

    let element = this.array[this.head];
    

let queue4 = new Queue([1, 2]);
console.log(queue4);

queue4.enqueue(3);
queue4.enqueue(4);
console.log(queue4);

console.log(queue4.dequeue());
console.log(queue4.dequeue());
console.log(queue4);