There is a wide variety in the type and format of questions I'm asked.

Phone screen type questions might be stuff like fibonacci, find the min in an array, or find the intersection (shared duplicates) of two arrays.

In-person stuff varies: some companies ask me more practical/specific stuff like Ruby/CSS/JS implementation/coding/design/architectural questions. Others ask puzzle type questions that require me to use data structures in clever ways. Interestingly, hashes and trees are my go-to data structures. Do depth-first search and breadth-first search and that'll get you pretty far with trees. 90% of questions I'm asked require using hashes and/or trees in clever ways.

I actually find interviewing gets more and more fun as you get into it.