foldRight
trait Collection[A] {
def foldRight[B](z: B)(op: (A, B) => B): B
}
foldRight
applies the binary operator op
to each element, going from right to left, and the previous op
result. The first time op
is applied it’s fed with the initial value z
.
On empty collections this function doesn’t apply op
and the initial value z
is directly returned.