What is a Circular Queue? Why is it needed?

Difficulty: 6/10

Ring Buffer, Memory Optimization, Concurrency

Circular Queue

A Circular Queue treats a fixed-size array as a circular buffer. When the rear reaches the end of the array, it wraps around to the beginning if space is available. This avoids wasting freed positions and prevents the need to shift elements after every dequeue.

javascript

1
Uses fixed-size storage efficiently.
2
Wrap-around reuses positions freed by dequeue operations.
3
Enqueue and dequeue can both be O(1).
4
Useful for bounded buffers, network buffers, producer-consumer systems, and streaming data.
5
The implementation must distinguish full and empty states, often using a size counter or reserved slot.

Scenario Questions

0-2 years experience

Follow-up Questions