On: Functors and Monads for People Who Have Read Too Many “Tutorials”

[the_af]

I'm not debating that; instead, I'm arguing functors are immediately useful in languages like Haskell. Don't know enough about CT to debate that point.

[_y5hn → the_af]

They are. Abstractions like functors makes the language more similar to other structured languages. Otherwise, the same would've needed explicit recursion all over the place, which is more error-prone.