Svelte.js Interview Questions and Answers

This section covers frequently asked Svelte.js interview questions.

1. What is Svelte.js?

Svelte is a modern JavaScript framework for building user interfaces (UIs). Unlike other frameworks like React or Vue, which do much of their work in the browser at runtime, Svelte compiles your code into highly optimized vanilla JavaScript at build time. This results in smaller bundle sizes and faster applications.

2. Svelte vs. React/Vue.

The major difference lies in how they operate. React and Vue perform DOM manipulation at runtime, while Svelte does this during the build process (compile time). Svelte compiles your code directly into optimized JavaScript that updates the DOM efficiently without needing a virtual DOM.

3. How Does Svelte.js Work?

You write Svelte components using a combination of HTML, CSS, and JavaScript. Svelte compiles this code into small, highly optimized vanilla JavaScript modules that are then included in your web pages. These modules directly update the DOM based on changes to your app's state.