Method peek

src/data-structures/queue/Queue.js:23–29

* Read the element at the front of the queue without removing it. * @return {*}

()

   * @return {*}
   */
  peek() {
    if (this.isEmpty()) {
      return null;
    }

    return this.linkedList.head.value;
  }

  /**
   * Add a new element to the end of the queue (the tail of the linked list).