The accumulate problem uses inaccurate terminology

[hjiang]

The accumulate problem asks for a function of type:

(fun((A) -> B), list(A)) -> list(B)

In most languages accumulate has the type:

(fun((A, B) -> A), A, list(B)) -> A

Perhaps calling it map would be more appropriate?

[NobbZ]

The name of the function is taken from the canonical data, and it has been point of discussion there a couple of times in public and private discussion channels.

Yes, accumulate is just map.