There are much better resources than LYAH.
Chris Allen has a good list and critique of different books/courses: http://bitemyapp.com/posts/2014-12-31-functional-education.h...
LYAH is a phenomenal introductory resource. As companion material I would also recommend the lecture series on C9 by Dr. Erik Meijer, https://channel9.msdn.com/Series/C9-Lectures-Erik-Meijer-Fun....
http://learnyouahaskell.com/