Scala Project Euler #2

fibonacci.scala

import scala.collection.mutable.MutableList

var a = MutableList(1,2)
var upto = 4000000
while(a(a.size - 2) + a(a.size - 1) < upto) {
  a += (a(a.size - 2) + a(a.size - 1))
}

var sum = 0
a.foreach(x => { if(x % 2 == 0) sum += x } )
println(sum)