try?.swift

class CustomObject {

  func value() throws -> Int {
    return 5
  }
  
  func optionalValue() throws -> Int? {
    return nil
  }

}

let object = CustomObject()
let x = try? object.value()
let y = try? object.optionalValue()

print("Type of x: \(type(of: x))\nType of y: \(type(of: y))")

// Swift 4.2
// Type of x: Optional<Int>
// Type of y: Optional<Optional<Int>>

// Swift 5
// Type of x: Optional<Int>
// Type of y: Optional<Int>