comparator_unahppiness.scala

scala> val l = List(2d, 1d, 4d, Double.NaN, 4d, Double.NaN, -99d, 666d)
l: List[Double] = List(2.0, 1.0, 4.0, NaN, 4.0, NaN, -99.0, 666.0)

scala> l.max
res0: Double = 666.0

scala> l.min
res1: Double = -99.0

scala> l.sorted
res2: List[Double] = List(-99.0, 1.0, 2.0, 4.0, 4.0, 666.0, NaN, NaN)

scala> l.sortWith((a,b)=>a>b)
res3: List[Double] = List(666.0, 4.0, 4.0, 2.0, 1.0, NaN, NaN, -99.0)

scala> l.sortWith((a,b)=>a<b)
res4: List[Double] = List(1.0, 2.0, 4.0, NaN, 4.0, NaN, -99.0, 666.0)

scala> val l = List(2d, 1d, 4d, Double.NaN, 4d, Double.NaN, -99d, 666d, Double.NaN)
l: List[Double] = List(2.0, 1.0, 4.0, NaN, 4.0, NaN, -99.0, 666.0, NaN)

scala> l.max
res5: Double = NaN

scala> l.min
res6: Double = NaN

scala> l.sorted
res7: List[Double] = List(-99.0, 1.0, 2.0, 4.0, 4.0, 666.0, NaN, NaN, NaN)

scala> l.sortWith((a,b)=>a>b)
res8: List[Double] = List(666.0, 4.0, 4.0, 2.0, 1.0, NaN, NaN, -99.0, NaN)

scala> l.sortWith((a,b)=>a<b)
res9: List[Double] = List(1.0, 2.0, 4.0, NaN, 4.0, NaN, -99.0, 666.0, NaN)

Scala 2.10.2