Why use two stacks to make a queue?

Question

I can see the advantage of using two stacks if an array implementation is used since stacks are more easily implemented using arrays than queues are. But if linked-lists ar

Answer 1

You can make an immutable queue using two immutable stacks.

But, if you just want a mutable queue, using two stacks is a great way to make it slower and more complicated than just using a linked list.