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Exercise 1

Implement peek and write some test code to ensure that it's working.

As you might have already noticed from the template, you'll need to use two pointers to implement a queue using a singly linked list. One pointer will always point to the front of the queue, and the other will point to the back of the queue.

Solution

The peek method in a queue is straightforward. It returns the value of the frontmost node or null if the queue is empty.

// some code above

peek() {
  return this.front ? this.front.val : null;
}

We use a ternary operator for simplicity. If the front element exists, this.front.val is returned; otherwise, it returns null. This can be rewritten with an if statement for clarity:

// some code above

peek() {
  if (this.front) {
    return this.front.val;
  }
  return null;
}

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