SwiftUI Lazy Stacks in iOS 14

iOS 14 Beta is now available and one of the new features is Lazy stacks. With a normal stack, all the layout happened at once, which meant poor performance for large lists of content, grids, etc. With Lazy stacks the views are only created when they first come on screen, greatly increasing the usefulness of stacks for large or infinite collections of content.

This is a companion discussion topic for the original entry at https://nsscreencast.com/episodes/443-swiftui-lazy-stacks