typedef readability

def average(xs:GenTraversable[Int]):Int={
        type IntTuple = (Int,Int)
        def addIntTuples(x:IntTuple,y:IntTuple):IntTuple=(x._1+y._1,x._2+y._2)
        val (sum,len)=xs.map(x=>(x,1))
            .aggregate((0,0))(addIntTuples,addIntTuples)
        sum/len
    }

def readableAverage(xs:GenTraversable[Int]):Int={
        type Sum = Int
        type Len = Int
        type SumLen = (Sum,Len)
        def plus(x:SumLen,y:SumLen):SumLen=(x._1+y._1,x._2+y._2)
        val (sum,len)=xs.map(x=>(x,1))
            .aggregate((0,0))(plus,plus)
        sum/len
    }