Book Image

Hands-On JavaScript High Performance

By : Justin Scherer
1 (1)
Book Image

Hands-On JavaScript High Performance

1 (1)
By: Justin Scherer

Overview of this book

High-performance web development is all about cutting through the complexities in different layers of a web app and building services and APIs that improve the speed and performance of your apps on the browser. With emerging web technologies, building scalable websites and sustainable web apps is smoother than ever. This book starts by taking you through the web frontend, popular web development practices, and the latest version of ES and JavaScript. You'll work with Node.js and learn how to build web apps without a framework. The book consists of three hands-on examples that help you understand JavaScript applications at both the server-side and the client-side using Node.js and Svelte.js. Each chapter covers modern techniques such as DOM manipulation and V8 engine optimization to strengthen your understanding of the web. Finally, you’ll delve into advanced topics such as CI/CD and how you can harness their capabilities to speed up your web development dramatically. By the end of this web development book, you'll have understood how the JavaScript landscape has evolved, not just for the frontend but also for the backend, and be ready to use new tools and techniques to solve common web problems.
Table of Contents (15 chapters)

Getting fancier – a basic weather application

It should be quite obvious that Svelte has built up its compiler to work with most of the modern ECMAScript standards. One area where they do not provide any sort of wrapper is for fetching data. A good way to add this and see the effects is to build a basic weather application.

A weather application, at its core, needs to be able to take in a zip code or city and spit out information about the current weather for that region. We can also get an outlook for the weather based on this location. Finally, we can also save these choices in the browser, so we can use them when we come back to the application.

For our weather data, we are going to pull from https://openweathermap.org/api. Here, the free service will allow us to get the current weather. On top of this, we will need an input system that will accept the following:

  • The...