Missing async functions

Optional.swift

extension Optional {
    func map<T>(
        transform: (Wrapped) async throws -> T
    ) async rethrows -> T? {
        guard case let .some(value) = self else { return nil }
        return try await transform(value)
    }
}

Sequence.swift

extension Sequence {
    func map<T>(
        _ transform: (Element) async throws -> T
    ) async rethrows -> [T] {
        var values = [T]()

        for element in self {
            try await values.append(transform(element))
        }

        return values
    }

    func compactMap<T>(
        _ transform: (Element) async throws -> T?
    ) async rethrows -> [T] {
        var values = [T]()

        for element in self {
            if let newElement = try await transform(element) {
                values.append(newElement)
            }
        }

        return values
    }
}