Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be:

1, 2, 3, 5, 8, 13, 21, 34, 55, 89, …

By considering the terms in the Fibonacci sequence whose values do not exceed four million, find the sum of the even-valued terms.

Code:

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val fibonachi = {
  val list = scala.collection.mutable.MutableList(1,2)
  var i:Int = 2
  do {
    val tmp = list(i-2) + list(i-1)
    list += tmp
    i+=1
  }while (list(i-1) < 4000000)
  list.init
}.filter(_ % 2 ==0).sum

println(fibonachi)

Answer : 4613732