Svelte vs React vs Vue comparison

Introduction

These three are popular tools to build websites and apps. Knowing their differences helps you pick the best one for your project.

You want a fast website with less code to write.

You want a big community and lots of ready-made parts.

You want simple setup and easy learning.

You want to build interactive user interfaces.

You want good support for mobile-friendly design.

Syntax

Svelte

Svelte: Uses components with HTML, CSS, and JS in one file.
React: Uses JavaScript with JSX to describe UI.
Vue: Uses single-file components with template, script, and style sections.

Svelte compiles your code to efficient JavaScript before running.

React and Vue run mostly in the browser to update the UI.

Examples

Svelte example: simple and clean with reactive variables.

Svelte

<script>
  let count = 0;
</script>
<button on:click={() => count++}>
  Clicked {count} times
</button>

React example: uses useState hook and JSX syntax.

Svelte

import React, { useState } from 'react';

function Counter() {
  const [count, setCount] = useState(0);
  return (
    <button onClick={() => setCount(count + 1)}>
      Clicked {count} times
    </button>
  );
}

Vue example: template with reactive ref variable.

Svelte

<template>
  <button @click="count++">
    Clicked {{ count }} times
  </button>
</template>

<script setup>
import { ref } from 'vue';
const count = ref(0);
</script>

Sample Program

This Svelte component lets you pick a framework from a dropdown and shows a short description. It updates instantly when you change the selection.

Svelte

<script>
  let framework = 'Svelte';
  let description = {
    Svelte: 'Compiles to fast JavaScript with less code.',
    React: 'Uses JSX and a large ecosystem.',
    Vue: 'Easy to learn with flexible templates.'
  };
</script>

<h1>{framework} vs React vs Vue</h1>
<p>{description[framework]}</p>

<select bind:value={framework} aria-label="Choose framework">
  <option value="Svelte">Svelte</option>
  <option value="React">React</option>
  <option value="Vue">Vue</option>
</select>

Important Notes

Svelte updates the page by compiling away the framework code, making apps fast.

React has a huge community and many tools but needs more setup.

Vue is beginner-friendly and balances features and simplicity well.

Summary

Svelte is great for speed and simplicity.

React is powerful with a big ecosystem.

Vue is easy to learn and flexible.

Practice

1. Which framework compiles your code to efficient JavaScript at build time, reducing runtime overhead?

easy

A. Svelte

B. React

C. Vue

D. Angular

Solution

1. Step 1: Understand Svelte's compilation approach

   Svelte compiles components to optimized JavaScript during build, so no virtual DOM at runtime.

2. Step 2: Compare with React and Vue runtime behavior

   React and Vue use virtual DOM diffing at runtime, adding overhead compared to Svelte.

3. Final Answer:

   Svelte -> Option A

4. Quick Check:

   Compile-time optimization = Svelte [OK]

Hint: Svelte compiles away framework code before running [OK]

Common Mistakes:

• Thinking React compiles away virtual DOM
• Confusing Vue's runtime with compile-time
• Assuming Angular behaves like Svelte

2. Which syntax is correct for creating a reactive variable in Svelte?

easy

A. var count = 0; function doubled() { return count * 2; }

B. const [count, setCount] = useState(0);

C. data() { return { count: 0 } }

D. let count = 0; $: doubled = count * 2;

Solution

1. Step 1: Identify Svelte reactive syntax

   Svelte uses $: label to declare reactive statements that update when dependencies change.

2. Step 2: Check other options for framework syntax

   const [count, setCount] = useState(0); is React useState, C is Vue data option, D is plain JS function.

3. Final Answer:

   let count = 0; $: doubled = count * 2; -> Option D

4. Quick Check:

   Svelte reactive label = $: [OK]

Hint: Svelte uses $: for reactive declarations [OK]

Common Mistakes:

• Using React or Vue syntax in Svelte
• Forgetting the $: label for reactivity
• Using var instead of let/const in Svelte

3. Given this Svelte code snippet, what will be displayed when count is 3?

 <script>
  let count = 3;
  $: doubled = count * 2;
</script>
<p>Doubled: {doubled}</p>

medium

A. Doubled: 3

B. Doubled: 9

C. Doubled: 6

D. Doubled: undefined

Solution

1. Step 1: Calculate doubled value

   With count = 3, doubled = 3 * 2 = 6.

2. Step 2: Understand Svelte reactive update

   The reactive statement updates doubled automatically, so the displayed value is 6.

3. Final Answer:

   Doubled: 6 -> Option C

4. Quick Check:

   count * 2 = 6 [OK]

Hint: Multiply count by 2 for doubled value [OK]

Common Mistakes:

• Confusing doubled with count
• Assuming doubled is undefined without initialization
• Multiplying incorrectly

4. Identify the error in this React code compared to Svelte's approach:

function Counter() {
  let count = 0;
  function increment() {
    count++;
  }
  return <button onClick={increment}>{count}</button>;
}

medium

A. count should be declared with const in React

B. React state must use useState hook, not a plain variable

C. Svelte requires on:click instead of onClick

D. React buttons cannot display variables

Solution

1. Step 1: Check React state management

   React requires useState hook to track state changes and trigger re-render.

2. Step 2: Identify why plain variable fails

   Using let count = 0 won't update UI on increment because React doesn't track it.

3. Final Answer:

   React state must use useState hook, not a plain variable -> Option B

4. Quick Check:

   React state needs useState [OK]

Hint: React state needs useState hook, not plain variables [OK]

Common Mistakes:

• Thinking onClick is invalid in React
• Using const for mutable state
• Believing React buttons can't show variables

5. You want to build a small interactive widget with minimal setup and fast load time. Which framework is best suited and why?

hard

A. Svelte, because it compiles to minimal JavaScript and runs fast

B. Vue, because it is easy to learn and has good tooling

C. React, because of its large ecosystem and flexibility

D. Angular, because it provides a full-featured framework

Solution

1. Step 1: Analyze requirements for minimal setup and fast load

   Minimal setup and fast load favor frameworks that produce small, efficient code.

2. Step 2: Compare frameworks on output size and runtime speed

   Svelte compiles away framework code, resulting in smaller bundles and faster startup than React or Vue.

3. Step 3: Consider ecosystem and complexity

   React and Vue have bigger ecosystems but more runtime overhead; Angular is heavier and more complex.

4. Final Answer:

   Svelte, because it compiles to minimal JavaScript and runs fast -> Option A

5. Quick Check:

   Minimal setup + speed = Svelte [OK]

Hint: Small, fast widget? Choose Svelte for minimal code [OK]

Common Mistakes:

• Picking React for minimal setup despite larger runtime
• Choosing Angular for small widgets
• Ignoring compile-time benefits of Svelte