For data types I almost always use List
I agree, I almost always use List for datatypes
find that I basically never need to do indexing
Likewise, rarely using it, except when parsing TSV data really.
Regarding cats, I’d rather stick to the standard lib as much as possible. Cats is impressive, but I certainly wouldn’t want to use it in every projects. I guess I’m one of those “blue sky” Scala people (I heard that term being used before, hopefully employed correctly here).
PS: love your blog