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Sample code from this blog post:
func foldl1<A>(list: Array<A>, f: (A, A) -> A) -> A {
return foldl(list.head!, list: list.tail!, f: f)
extension Array {
var initial: Array<Element>? {
get {
if self.empty() { return nil }
return Array(dropLast(self))
func foldr<A,B>(acc: A, list: Array<B>, f: (B, A) -> A) -> A {
if list.empty() { return acc }
return foldr(f(list.last!, acc), list: list.initial!, f: f);
func foldr1<A>(list: Array<A>, f: (A, A) -> A) -> A {
return foldr(list.last!, list: list.initial!, f: f)
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