Scala: Producing the intermediate results of a fold

Question

I\'ve come across the problem of maintaining a state throughout a map operation several times. Imagine the following task:

Given a List[Int], map each element to the

Answer 1

@Dario gave the answer, but just to add that the scala library provides scanLeft:

scala> List(1,2,3).scanLeft(0)(_ + _)
res26: List[Int] = List(0, 1, 3, 6)