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

In addition to the existing answers,

Map() ++ set.view.map(i => i -> f(i))

is pretty short and performs as well as the faster answers (fold/breakOut).

(Note the view to prevent creation of a new collection; it does the remapping as it goes.)