JavaScript

16 lessons — from the very basics to pro-level patterns.

Basics

0. Why Learn JavaScript?

The language of the web — it runs in every browser on Earth

1. Variables & Data Types

let, const, and the types that live inside them

2. Operators & Expressions

Math, logic, and the === vs == puzzle

3. Strings & Template Literals

Backticks, interpolation, and handy methods

4. Conditionals

if/else, switch, and the ternary shortcut

for, while, and the modern for...of

Collections

The Swiss Army knife of JavaScript collections

Key-value pairs — the backbone of JS

Functions

Declarations, arrows, and closures

9. Array Higher-Order Methods

map, filter, reduce — loop without looping

Intermediate

10. DOM Manipulation

Make web pages come alive with JavaScript

11. Error Handling

try/catch and throwing your own errors

12. Classes & OOP

Blueprints for creating objects

13. Modules & Imports

import/export — keep your code organized

Advanced

14. Async Programming

Promises, async/await, and fetching data

15. Closures & Scope

How JavaScript remembers things