LukaJCB

val firm = personOption
   .flatMap(_.residence)
   .flatMap(_.address)
   .map(_.constructionFirm)

LukaJCB

val firm = for {
    person <- personOption
    residence <- person.residence
    address <- residence.address
} yield address.constructionFirm

LukaJCB

let firm: Optional<String> = personOption
    .flatMap { $0.residence }
    .flatMap { $0.address }
    .map { $0.constructionFirm }

LukaJCB

let firm: String? = personOption?.residence?.address?.constructionFirm

LukaJCB

val firm: String? = personOption?.residence?.address?.constructionFirm

LukaJCB

String constructionFirm = person?.residence?.address?.constructionFirm;

LukaJCB

func filter<T>(arr: [T], predicate: T -> Bool) -> [T]

LukaJCB

square = lambda x: x**2

LukaJCB

var sum = 0
ints.filter { it > 0 }.forEach {
  sum += it
}

LukaJCB

point =                       
  { x = 1, y = 5 }

point2 = 
  { point | x = 21 }