While this is a statement in some ways of preference it is a reasonable comment; not sure why it's getting downvoted.

However, can you clarify why you would argue for type classes over duck/structural typing? You indicate that 'type classes are the way to go' but don't explain why.

Scala of course does have a form of Type Classes and while they tend to be what I reach for more often than Structural Types in Scala, it doesn't obviate Structural Types completely and I'd be interested in analysis of the diffs.