traverseState<S, B> method

State<S, Option<B>> traverseState<S, B>(
  1. State<S, B> f(
    1. A a
    )
)

Implementation

State<S, Option<B>> traverseState<S, B>(State<S, B> f(A a)) => fold(() => new State((s) => tuple2(none(), s)), (a) => f(a).map(some));