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JS

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JS

See JavaScript
come alive.

From zero to frameworks — interactive visualizations that make code intuitive. Built for complete beginners.

Start Learning Visualizer

85Chapters

12Modules

FreeForever

Complete a chapter to light your first flame!

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Curriculum

Module 1 — Getting Started

1.1Introduction to JavaScript 1.2Variables & Types 1.3Operators 1.4Type Conversion 1.5User Interaction

Module 2 — Control Flow

2.1Conditionals 2.2Logical Thinking 2.3Loops 2.4Loop Control 2.5Nested Loops

Module 3 — Functions

3.1Functions 3.2Parameters 3.3Return Values 3.4Function Expressions 3.5Arrow Functions 3.6Scope & Closures 3.7Callbacks

Module 4 — Data Structures

4.1Arrays 4.2Array Methods 4.3Objects 4.4Object Methods 4.5Destructuring 4.6Spread & Rest 4.7JSON 4.8Strings

Interactive Tool

Code Visualizer

Paste any JavaScript and watch it execute step-by-step. See the call stack, memory, scope chain, and closures come alive in real time.

Try the Visualizer

function fibonacci(n) {

if (n <= 1) return n;

return fibonacci(n-1) + fibonacci(n-2);

// ▶ Call Stack: fibonacci(4)

// ⬡ Memory: { n: 4 }