I wouldn't call this a trick. This is a staple in the data structures books when...

pkd on Aug 27, 2016 | parent | context | favorite | on: Itsy Bitsy Data Structures – Simplified examples o...

I wouldn't call this a trick. This is a staple in the data structures books when they teach how to implement queues using arrays. The same approach can be extended to implementing circular and double ended queues as well.