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)

Build the basics – a Todo application

To start off our Todo application, let's go ahead and utilize the template that we already have. Now, in most Todo applications, we want to be able to do the following things:

  • Add
  • Remove/mark complete
  • Update

So what we have is a basic CRUD application without any server operations. Let's go ahead and write the Svelte HTML that we would expect for this application:

<script>
import { createEventDispatcher } from 'svelte';
export let completed;
export let num;
export let description;

const dispatch = createEventDispatcher();
</script>
<style>
.completed {
text-decoration: line-through;
}
</style>
<li class:completed>
Task {num}: {description}
<input type="checkbox" bind:checked={completed} />
<button on:click="{() => dispatch...