Data Structures

Welcome to the JavaScript data structures guide. This section teaches the core values and structures you will use constantly in JavaScript, from variables and primitive types to arrays, objects, and JSON.

Variables and values

Start by learning how JavaScript stores data and how different value types behave.

Variables and Values

Data Types

Numbers

Booleans

Strings, arrays, and objects

Continue with JavaScript's most common built-in data structures and related syntax.

Strings

Arrays

Objects (Plain Objects)

JSON

Rest and Spread