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

What about this:

(s map { i => i -> func(i) }).toMap

This maps the elements of s to tuples (i, func(i)) and then converts the resulting collection to a Map.

Note: i -> func(i) is the same as (i, func(i)).

dbyrne suggests creating a view of the set first (see his answer and comments), which prevents an intermediate collection from being made, improving performance:

(s.view map { i => i -> func(i) }).toMap