scala> import scala.collection.immutable.ListMap
import scala.collection.immutable.ListMap

scala> ListMap[Int, String]( (42, "hi"), (66, "world") )
res1: scala.collection.immutable.ListMap[Int,String] = Map(42 -> hi, 66 -> world)

scala> val list: List[(Int, String)] = List( (42, "hi"), (66, "world") )
list: List[(Int, String)] = List((42,hi), (66,world))

scala> ListMap[Int, String]( list: _* )
res2: scala.collection.immutable.ListMap[Int,String] = Map(42 -> hi, 66 -> world)