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The library for web and native user interfaces.

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A declarative, efficient, and flexible JavaScript library for building user interfaces.

Quick Overview

Svelte is a modern JavaScript framework for building user interfaces. It compiles your code to vanilla JavaScript at build time, resulting in smaller bundle sizes and better performance compared to traditional frameworks.

Pros

  • Extremely lightweight and fast due to its compile-time approach
  • Simple and intuitive syntax with less boilerplate code
  • Built-in reactivity without the need for a virtual DOM
  • Excellent documentation and growing community support

Cons

  • Smaller ecosystem compared to more established frameworks like React or Vue
  • Limited server-side rendering options
  • Potential for larger initial bundle size in complex applications
  • Less suitable for large-scale enterprise applications compared to more mature frameworks

Code Examples

  1. Basic component with reactive declarations:
<script>
  let count = 0;
  $: doubled = count * 2;

  function increment() {
    count += 1;
  }
</script>

<button on:click={increment}>
  Clicked {count} {count === 1 ? 'time' : 'times'}
</button>

<p>The doubled value is {doubled}</p>
  1. Handling props and events:
<script>
  export let name;
  
  function handleClick() {
    dispatchEvent(new CustomEvent('greet', {
      detail: { message: `Hello, ${name}!` }
    }));
  }
</script>

<button on:click={handleClick}>
  Greet {name}
</button>
  1. Using Svelte stores for global state management:
<script>
  import { writable } from 'svelte/store';

  const count = writable(0);

  function increment() {
    count.update(n => n + 1);
  }
</script>

<button on:click={increment}>
  Increment
</button>

<p>The count is {$count}</p>

Getting Started

To start a new Svelte project:

  1. Install the required dependencies:

    npx degit sveltejs/template my-svelte-project
    cd my-svelte-project
    npm install
    
  2. Start the development server:

    npm run dev
    
  3. Open your browser and navigate to http://localhost:5000 to see your Svelte app running.

  4. Edit the files in the src directory to start building your application.

Competitor Comparisons

227,213

The library for web and native user interfaces.

Pros of React

  • Larger ecosystem and community support
  • More mature and battle-tested in large-scale applications
  • Extensive third-party libraries and tools

Cons of React

  • Steeper learning curve, especially for beginners
  • Requires additional libraries for state management and routing
  • Larger bundle size compared to Svelte

Code Comparison

React component:

function Greeting({ name }) {
  return <h1>Hello, {name}!</h1>;
}

Svelte component:

<script>
  export let name;
</script>

<h1>Hello, {name}!</h1>

React and Svelte are both popular frontend frameworks, but they differ in their approach to building user interfaces. React uses a virtual DOM and JSX syntax, while Svelte compiles components into efficient JavaScript at build time.

React's component-based architecture and unidirectional data flow make it powerful for complex applications. However, Svelte's simplicity and smaller bundle size make it attractive for smaller projects and performance-critical applications.

Ultimately, the choice between React and Svelte depends on project requirements, team expertise, and specific use cases. Both frameworks have their strengths and can be excellent choices for web development.

207,677

This is the repo for Vue 2. For Vue 3, go to https://github.com/vuejs/core

Pros of Vue

  • Larger ecosystem and community support
  • More mature and battle-tested in production environments
  • Extensive documentation and learning resources

Cons of Vue

  • Steeper learning curve, especially for complex applications
  • Larger bundle size compared to Svelte
  • More boilerplate code required for basic functionality

Code Comparison

Vue component:

<template>
  <div>{{ message }}</div>
</template>

<script>
export default {
  data() {
    return {
      message: 'Hello Vue!'
    }
  }
}
</script>

Svelte component:

<script>
  let message = 'Hello Svelte!';
</script>

<div>{message}</div>

The Svelte example demonstrates its more concise syntax and reduced boilerplate compared to Vue. Svelte's approach often results in less code and a simpler component structure, while Vue follows a more traditional component organization with separate template and script sections.

Both frameworks offer reactive data binding and component-based architecture, but Svelte's compiler-based approach allows for smaller bundle sizes and potentially better performance in some scenarios. Vue, on the other hand, provides a more flexible and feature-rich ecosystem, making it suitable for a wider range of project sizes and complexities.

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Deliver web apps with confidence 🚀

Pros of Angular

  • Comprehensive framework with built-in tools for routing, forms, and HTTP requests
  • Strong TypeScript integration and support
  • Large ecosystem and community backing

Cons of Angular

  • Steeper learning curve due to its complexity
  • Larger bundle size, potentially impacting initial load times
  • More verbose syntax compared to Svelte's concise approach

Code Comparison

Angular component:

@Component({
  selector: 'app-hello',
  template: '<h1>Hello, {{name}}!</h1>'
})
export class HelloComponent {
  name: string = 'World';
}

Svelte component:

<script>
  let name = 'World';
</script>

<h1>Hello, {name}!</h1>

Angular and Svelte are both popular frontend frameworks, but they differ significantly in their approach. Angular offers a full-featured ecosystem with robust tooling, while Svelte focuses on simplicity and performance through its compile-time approach. Angular's TypeScript integration is excellent, but it comes with a steeper learning curve. Svelte, on the other hand, provides a more straightforward syntax and smaller bundle sizes. The code comparison illustrates the difference in verbosity between the two frameworks, with Svelte offering a more concise way to create components. Ultimately, the choice between Angular and Svelte depends on project requirements, team expertise, and performance considerations.

36,546

⚛️ Fast 3kB React alternative with the same modern API. Components & Virtual DOM.

Pros of Preact

  • Smaller bundle size, leading to faster load times
  • Closer to vanilla JavaScript, potentially easier for developers familiar with DOM manipulation
  • Compatible with many React libraries and tools

Cons of Preact

  • Smaller ecosystem and community compared to Svelte
  • Less built-in features and abstractions, requiring more manual work
  • May require additional configuration for optimal performance

Code Comparison

Preact:

import { h, render } from 'preact';

function App() {
  return <h1>Hello, World!</h1>;
}

render(<App />, document.body);

Svelte:

<script>
  let greeting = 'Hello, World!';
</script>

<h1>{greeting}</h1>

Summary

Preact is a lightweight alternative to React, focusing on performance and simplicity. It's ideal for projects where bundle size is crucial. Svelte, on the other hand, offers a more opinionated and feature-rich development experience with its compiler-based approach. Preact's syntax is more familiar to React developers, while Svelte introduces a new paradigm that can lead to less boilerplate code. Both have their strengths, and the choice between them often depends on specific project requirements and developer preferences.

27,910

A rugged, minimal framework for composing JavaScript behavior in your markup.

Pros of Alpine

  • Lightweight and minimal, with a smaller learning curve
  • Can be easily added to existing projects without a build step
  • Integrates well with server-side rendering frameworks

Cons of Alpine

  • Less powerful for complex applications compared to Svelte
  • Limited ecosystem and fewer community-built components
  • Lacks built-in state management for larger applications

Code Comparison

Alpine:

<div x-data="{ count: 0 }">
    <button @click="count++">Increment</button>
    <span x-text="count"></span>
</div>

Svelte:

<script>
    let count = 0;
</script>

<button on:click={() => count++}>Increment</button>
<span>{count}</span>

Summary

Alpine is a lightweight JavaScript framework that's easy to add to existing projects, while Svelte is a more comprehensive solution for building web applications. Alpine shines in its simplicity and ease of use, making it ideal for adding interactivity to static sites or enhancing server-rendered pages. Svelte, on the other hand, offers a more powerful and feature-rich environment for building complex applications, with better performance and a more robust ecosystem. The choice between the two depends on the project's requirements, complexity, and the developer's familiarity with each framework.

32,037

A declarative, efficient, and flexible JavaScript library for building user interfaces.

Pros of Solid

  • Fine-grained reactivity with better performance in complex scenarios
  • No virtual DOM, resulting in smaller bundle sizes
  • More explicit control over component updates

Cons of Solid

  • Smaller community and ecosystem compared to Svelte
  • Steeper learning curve, especially for developers new to reactive programming
  • Less mature tooling and IDE support

Code Comparison

Svelte component:

<script>
  let count = 0;
  const increment = () => count++;
</script>

<button on:click={increment}>
  Clicks: {count}
</button>

Solid component:

import { createSignal } from "solid-js";

function Counter() {
  const [count, setCount] = createSignal(0);
  return <button onClick={() => setCount(count() + 1)}>
    Clicks: {count()}
  </button>;
}

Both Svelte and Solid aim to provide efficient, reactive UI development experiences. Svelte offers a more approachable syntax and a compiler-based approach, while Solid focuses on fine-grained reactivity and runtime performance. The choice between them often depends on project requirements, team expertise, and personal preferences.

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README

Cybernetically enhanced web apps: Svelte

license Chat

What is Svelte?

Svelte is a new way to build web applications. It's a compiler that takes your declarative components and converts them into efficient JavaScript that surgically updates the DOM.

Learn more at the Svelte website, or stop by the Discord chatroom.

Supporting Svelte

Svelte is an MIT-licensed open source project with its ongoing development made possible entirely by fantastic volunteers. If you'd like to support their efforts, please consider:

Funds donated via Open Collective will be used for compensating expenses related to Svelte's development such as hosting costs. If sufficient donations are received, funds may also be used to support Svelte's development more directly.

Roadmap

You may view our roadmap if you'd like to see what we're currently working on.

Contributing

Please see the Contributing Guide and the svelte package for information on contributing to Svelte.

svelte.dev

The source code for https://svelte.dev lives in the sites folder, with all the documentation right here. The site is built with SvelteKit.

Is svelte.dev down?

Probably not, but it's possible. If you can't seem to access any .dev sites, check out this SuperUser question and answer.

License

MIT

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