Scala: How to create a Map[K,V] from a Set[K] and a function from K to V?

Question

What is the best way to create a Map[K,V] from a Set[K] and function from K to V?

For example, suppose I have

Answer 1

Without definition of func(i: Int) using "string repeating" operator *:

scala> s map { x => x -> x.toString*2 } toMap
res2: scala.collection.immutable.Map[Int,String] = Map(2 -> 22, 3 -> 33, 5 -> 55)