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Learn to code / javascript

JavaScript Fundamentals

Learn JavaScript from scratch — values, control flow, functions, arrays, and objects. No prior programming experience required.

12 lessons·245 guided minutes·Real checks, not completion clicks
Try the first lesson →All courses
01

Hello, JavaScript!

Write and run your first JavaScript program with console.log.

~10 min →02

Variables and strings

Store values in variables and stitch strings together with template literals.

~15 min →03

Conditionals

Branch your program with if, else, and comparison operators.

~15 min →04

Loops

Repeat work with for and while loops.

~15 min →05

Functions

Bundle behavior into reusable functions with parameters and return values.

~20 min →06

Functions, deeper

Functions as values, callbacks, arrow functions, and closures.

~20 min →07

Arrays

Store lists of values and use core array methods like push, map, and filter.

~20 min →08

Objects

Group related values under named keys with plain JavaScript objects.

~20 min →09

Debugging

Find and fix the bug — console.log, stack traces, and the common JS pitfalls.

~20 min →10

Mini project: Habit tracker

Use everything you've learned to build a small habit tracker from scratch.

~30 min →11

Capstone: Event Tracker

Combine arrays, objects, and callbacks to model and query a small calendar.

~30 min →12

Capstone: Todo List

Build a todo list with immutable updates — add, toggle, filter, and tally.

~30 min →