Union of two sets in Scala

Question

From the question linked here, I found this implementation of Union in Scala:

def union(a: Set, b: Set): Set = i => a(i) || b(i)

And Set is

Answer 1

You can implement a union function like this:

def union[A](set1: Set[A], set2:Set[A]):Set[A] = {
    set1.foldLeft(set2)((set, elem) => set + elem)
}

or

def union[A](set1: Set[A], set2:Set[A]):Set[A] = {
    set1.flatMap(elem => set2 + elem)
}

These will be generic so you can use it for sets of any type