Recall & Review
beginner
What does 'peek' mean in the context of a queue?
Peek means to look at the front element of the queue without removing it.
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beginner
Why is peeking useful in a queue?
Peeking lets you see the next item to be processed without changing the queue, so you can decide what to do next.
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intermediate
What happens if you peek an empty queue?
Peeking an empty queue usually returns None or raises an error because there is no front element to see.
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beginner
Show a simple Python code snippet to peek the front element of a queue implemented as a list.
queue = [10, 20, 30]
front = queue[0] if queue else None
print(front) # Output: 10
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beginner
How does peeking differ from dequeue operation in a queue?
Peeking only looks at the front element without removing it, while dequeue removes and returns the front element.
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What does the peek operation do in a queue?
✗ Incorrect
Peek returns the front element without removing it from the queue.
What will peek return if the queue is empty?
✗ Incorrect
Peeking an empty queue returns None or raises an error because there is no element to show.
Which Python list index is used to peek the front element of a queue implemented as a list?
✗ Incorrect
The front element is at index 0 in a list representing a queue.
What is the difference between peek and dequeue in a queue?
✗ Incorrect
Peek looks at the front element without removing it; dequeue removes and returns the front element.
If queue = [5, 10, 15], what does peek return?
✗ Incorrect
The front element is 5, so peek returns 5.
Explain how to peek the front element of a queue and why it is useful.
Think about checking the next item without changing the queue.
You got /3 concepts.
Describe what happens when you peek an empty queue and how to handle it in code.
Consider what happens if the queue has no items.
You got /3 concepts.