Variadic Parameter

• The values passed to a variadic parameter are made available within the function’s body as an array of the appropriate type.

• A function can have multiple variadic parameters.

• The first parameter that comes after a variadic parameter must have an argument label.

code

// ⭐️ variadic parameter
func f1(_ ints: Int...) -> Int { return 1 }

func f2(_ ints: Int...) -> Int {     // `ints` is of type `[Int]`
    // ⛔ cannot convert value of type '[Int]' 
    //    to expected argument type 'Int'
    return f1(ints) 
}

// The only way to solve this (for now) is to add 
// another method overload accepting an array

📘 手冊

• Swift ⟩ Variadic Parameters

📗 參考

• Passing Variadic Parameters around in Swift

👥 相關

• Destructuring

🗣 討論

• Swift forum ⟩ Another attempt at passing arrays as varargs