JavaScript · Easy

Lesson 1 · On the house

Modules with import

Split files; name what you export.

Lesson 2

Destructuring

Unpack arrays and objects.

Lesson 3

Array methods that return

map, filter, reduce — without mutating the source habitually.

Lesson 4

Errors with try/catch

Throw, catch, and finally.

Lesson 5

JSON

Parse and stringify data.

Lesson 6

Closures

Functions that remember outer bindings.

Lesson 7

this and methods

Methods, call sites, and arrows.

Lesson 8

Classes

Syntax sugar over prototypes.

Lesson 9

Promises basics

Thenables for async success and failure.

Lesson 10

async/await

Pause a function until a promise settles.