FoundationalFull track availableFrontend

JavaScript Core

The language of the web — variables, functions, async, DOM

14 atomsSpaced repetitionLearn at your own pace

What you'll learn

let, const & var — scope, hoisting

Arrow functions & lexical this

Array methods: map, filter, reduce, find

Destructuring (arrays & objects)

Spread & rest operators

Template literals

Promises — then, catch, Promise.all

async / await

ES Modules — import & export

DOM selection & manipulation

Event listeners & delegation

Fetch API — GET, POST, error handling

Classes & inheritance

Optional chaining & nullish coalescing