The JavaScript programming language is an essential tool of web developers today. Websites ship more and more JavaScript to the browser to be more interactive. The more complex client-side JavaScript gets, the more error-prone and fragile the user experience might get. Why do we need to talk about robust JavaScript and how do we achieve it?
By the numbers, JavaScript is a performance liability. If the trend persists, the median page will be shipping at least 400 KB of it before too long, and that’s merely what’s transferred. Like other text-based resources, JavaScript is almost always served compressed—but that might be the only thing we’re getting consistently right in its delivery.
App clips are a great way for users to quickly access and experience what your app has to offer. An app clip is a small part of your app that’s discoverable at the moment it’s needed. App clips are fast and lightweight so a user can open them quickly. Whether they're ordering take-out from a restaurant, renting a scooter, or setting up a new connected appliance for the first time, users will be able to start and finish an experience from your app in seconds. And when they’re done, you can offer the opportunity to download your full app.
Damage - Matt Gemmell
Robust Client-Side JavaScript – A Developer’s Guide · molily
Responsible JavaScript: Part I · An A List Apart Article
App Clips - Apple Developer