JS Practice — Built-in Objects

Generics — swap<T, U>

📖 Usage Example

function swap<T, U>(pair: [T, U]): [U, T] { return [pair[1], pair[0]] }
swap([1, 'hello'])   // → ['hello', 1]

swap<T, U> reverses a two-element tuple, preserving the individual types.

Generics: swap a Pair

Challenge: Implement swap<T, U>(pair: [T, U]): [U, T] that reverses a two-element tuple.

swap([1, 'a'])     // → ['a', 1]
swap([true, 42])   // → [42, true]

💡 Hints (1)