We want to write a function that generates accumulators-- a function that takes a number n, and returns a function that takes another number i and returns n incremented by i. See the article Revenge of the Nerds http://www.paulgraham.com/icad.html This Scala solution comes from http://rosettacode.org/wiki/Accumulator_factory#Scala

Accumulator.scala

def AccumulatorFactory[N](n: N)(implicit num: Numeric[N]) = {
  import num._
  var acc = n
  (inc: N) => {
    acc = acc + inc
    acc
  }
}