sample.swift

// ref: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/concurrency/#Defining-and-Calling-Asynchronous-Functions
func generateSlideshow(forGallery gallery: String) async {
    let photos = await listPhotos(inGallery: gallery)
    for photo in photos {
        // ... render a few seconds of video for this photo ...
        await Task.yield()
    }
}