Svelte vs React vs Vue comparison - Hands-On Comparison

Svelte vs React vs Vue Comparison

📖 Scenario: You are building a simple web page to compare three popular frontend frameworks: Svelte, React, and Vue. This page will show a list of frameworks with their key features so users can understand their differences easily.

🎯 Goal: Create a Svelte component that displays a list of three frameworks (Svelte, React, Vue) with their main features. You will start by setting up the data, then add a filter to show only frameworks with a certain feature, then display the filtered list, and finally add a heading to complete the page.

📋 What You'll Learn

Create a list of frameworks with exact names and features

Add a filter string variable to select frameworks by feature

Use a Svelte {#each} block to show only frameworks that include the filter feature

Add a heading element to the component

💡 Why This Matters

🌍 Real World

Comparing frontend frameworks helps developers choose the right tool for their projects by understanding key differences clearly.

💼 Career

Frontend developers often need to present or explain technology choices. Building such comparison components is a common task in documentation or marketing sites.

1

DATA SETUP: Create the frameworks list

Create a variable called frameworks that is a list of objects. Each object must have name and features keys. Use these exact entries: { name: 'Svelte', features: ['No virtual DOM', 'Compile-time'] }, { name: 'React', features: ['Virtual DOM', 'JSX'] }, { name: 'Vue', features: ['Virtual DOM', 'Templates'] }.

Svelte

# Create the frameworks list with exact entries

Hint

Use let frameworks = [ ... ] with objects inside the array.

2

CONFIGURATION: Add a filter feature variable

Add a variable called filterFeature and set it to the string 'Virtual DOM'. This will be used to filter frameworks by this feature.

Svelte

let frameworks = [
  { name: 'Svelte', features: ['No virtual DOM', 'Compile-time'] },
  { name: 'React', features: ['Virtual DOM', 'JSX'] },
  { name: 'Vue', features: ['Virtual DOM', 'Templates'] }
];

// Add the filterFeature variable below

Hint

Use let filterFeature = 'Virtual DOM'; to create the filter string.

3

CORE LOGIC: Display filtered frameworks using {#each}

Use a Svelte {#each} block to loop over frameworks filtered by checking if filterFeature is included in each framework's features list. For each matching framework, display its name inside a <li> element.

Svelte

let frameworks = [
  { name: 'Svelte', features: ['No virtual DOM', 'Compile-time'] },
  { name: 'React', features: ['Virtual DOM', 'JSX'] },
  { name: 'Vue', features: ['Virtual DOM', 'Templates'] }
];

let filterFeature = 'Virtual DOM';

Hint

Use {#each frameworks.filter(fw => fw.features.includes(filterFeature)) as fw} to loop only matching frameworks.

4

COMPLETION: Add a heading to the component

Add an <h2> heading above the list with the exact text Frameworks with Virtual DOM feature.

Svelte

let frameworks = [
  { name: 'Svelte', features: ['No virtual DOM', 'Compile-time'] },
  { name: 'React', features: ['Virtual DOM', 'JSX'] },
  { name: 'Vue', features: ['Virtual DOM', 'Templates'] }
];

let filterFeature = 'Virtual DOM';

// Add an  heading above the list


  {#each frameworks.filter(fw => fw.features.includes(filterFeature)) as fw}
    {fw.name}
  {/each}

Hint

Simply add <h2>Frameworks with Virtual DOM feature</h2> above the list.

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