Hi guys.
I just finished a book (desktop publishing): Build Super Helpful and Interesting Things with Julia.
It contains 40 programming exercises at levels easy to moderate (everything is relative)
that are haphazardly scattered through the chapters. If you are interested, you may give it a try.
The book is available freely under CC BY-NC-SA 4.0 license and was submitted as a proposal (PR) to julialang.org. Chances are that in the future it will be listed at: Books