Book Image

Real-World Svelte

By : Tan Li Hau
4.3 (4)
Book Image

Real-World Svelte

4.3 (4)
By: Tan Li Hau

Overview of this book

Svelte has quickly become a popular choice among developers seeking to build fast, responsive, and efficient web applications that are high-performing, scalable, and visually stunning. This book goes beyond the basics to help you thoroughly explore the core concepts that make Svelte stand out among other frameworks. You’ll begin by gaining a clear understanding of lifecycle functions, reusable hooks, and various styling options such as Tailwind CSS and CSS variables. Next, you’ll find out how to effectively manage the state, props, and bindings and explore component patterns for better organization. You’ll also discover how to create patterns using actions, demonstrate custom events, integrate vanilla JS UI libraries, and progressively enhance UI elements. As you advance, you’ll delve into state management with context and stores, implement custom stores, handle complex data, and manage states effectively, along with creating renderless components for specialized functionalities and learning animations with tweened and spring stores. The concluding chapters will help you focus on enhancing UI elements with transitions while covering accessibility considerations. By the end of this book, you’ll be equipped to unlock Svelte's full potential, build exceptional web applications, and deliver performant, responsive, and inclusive user experiences.
Table of Contents (22 chapters)
1
Part 1: Writing Svelte Components
6
Part 2: Actions
10
Part 3: Context and Stores
16
Part 4: Transitions

Introducing the tweened and spring stores

Let us begin our journey into the world of Svelte animations by understanding the concept of tweened and spring stores.

The tweened and spring stores are writable stores that typically hold numeric values. To see the features they offer, let us compare them with a regular numeric variable.

If you are not familiar with writable stores, you can check out Chapter 8, where we extensively explained Svelte stores and creating writable Svelte stores using the built-in writable() function.

Usually, when you have a numeric variable and you update the variable, the value of the variable changes instantly. In the following example, we have a numeric variable, height, whose initial value is 10. When we assign a new value of 20 to the variable, the value of the variable changes to 20 immediately:

let height = 10;
height = 20;

If we use this numeric variable to represent the height of an element or the progress in a progress bar, the height...