Learn JavaScript

An in-depth course on the basics of JavaScript.

A brief history of JavaScript and an overview of its basic rules.

The basic "primitive" data types of JavaScript.

Learn how to use JavaScript's number data type.

Learn how to use JavaScript's string data type.

Learn how to use JavaScript's boolean data type.

Learn how to use JavaScript's null and undefined data types.

Learn how to use JavaScript's BigInt data type.

Learn how to use JavaScript's symbol data type.

Learn how to use JavaScript variables.

Learn how to use comparison operators.

Learn about JavaScript's control flow.

An introduction to JavaScript functions.

An introduction to JavaScript function expressions.

Call functions using the `new` keyword to create objects.

Use the `return` keyword to get more out of your functions.

Use the `this` keyword to work with the context your function executes in.

Introduction to JavaScript objects.

Learn how to set, alter, and access the properties of an object.

JavaScript objects and prototypal inheritance.

Use property descriptors to configure your JavaScript objects.

Learn how to use indexed collections such as arrays.

Learn how to use keyed collections such as maps and sets.

Learn how to use classes in JavaScript.

The `extends` keyword lets you create subclasses of existing classes.

Use class fields and methods to add properties to your classes.

Use static initialization blocks to set or alter static fields.

Additional information that might be helpful on your JavaScript journey.