What are the differences between a queue and a deque?

What are the differences between a queue and a deque?

A queue is a linear data structure that follows the First In First Out (FIFO) principle, while a deque (double-ended queue) allows insertion and deletion from both ends.

Can you give me examples of when to use each?

Sure! Use a queue for tasks like print job scheduling, and a deque for scenarios like undo functionality in applications.

What are the performance differences between them?

Both have O(1) time complexity for insertions and deletions, but a deque can be more versatile due to its double-ended nature.

Are there any programming languages that implement these differently?

Yes, for example, Python has collections.deque which is optimized for fast appends and pops from both ends, while Java has Queue and Deque interfaces with different implementations.