struct Person {
  var name: String = ""
  var age: Int = 0
  var website: NSURL?

  init() {

  }
}

extension Person: Initable {}

let person: Person = construct {
  $0.name = "Luffy"
  $0.age = 17
}

XCTAssertEqual(person.name, "Luffy")
XCTAssertEqual(person.age, 17)
XCTAssertNil(person.website)

var person = Person() // Declare as `var`
build(&person) {      // Use `&`
  $0.name = "Luffy"
  $0.age = 17
}

XCTAssertEqual(person.name, "Luffy")
XCTAssertEqual(person.age, 17)
XCTAssertNil(person.website)

class Car {
  var model: String = ""
  var price: Int = 0
}

extension Car: Configurable {}

let car = build(Car()) {
  $0.model = "Tesla Model 3"
  $0.price = 35_000
}

XCTAssertEqual(car.model, "Tesla Model 3")
XCTAssertEqual(car.price, 35_000)

let car = Car().configure {
  $0.model = "Tesla Model 3"
  $0.price = 35_000
}

XCTAssertEqual(car.model, "Tesla Model 3")
XCTAssertEqual(car.price, 35_000)