Euler2.scala

package ProjectEuler

object Euler2 {
    /** 
	*Problem Statement : 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.

    **/

    def nextFib(x: Int, y: Int): Stream[Int] = { 
        x #:: nextFib(y, x+y)
    }
  
    def fib = nextFib(1,1)
  
    def main (args : Array[String]) {
        println(fib.takeWhile(_ <= 4000000).filter(_ % 2 == 0).sum)
    }
 
}