partition method

Tuple2<ISet<A>, ISet<A>> partition(
  1. bool f(
    1. A a
    )
)

Implementation

Tuple2<ISet<A>, ISet<A>> partition(bool f(A a)) =>
  foldLeft(tuple2(new ISet.empty(_tree._order), new ISet.empty(_tree._order)),
      (acc, a) => f(a)
        ? acc.map1((s1) => s1.insert(a))
        : acc.map2((s2) => s2.insert(a)));