Learn JavaScript

An in-depth course on the basics of JavaScript.

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1

Welcome to Learn JavaScript!

Article

An in-depth course on the basics of JavaScript.

2

Introduction to JavaScript

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

3

Data types and structures

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The basic "primitive" data types of JavaScript.

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Numbers

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Learn how to use JavaScript's number data type.

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Strings

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Learn how to use JavaScript's string data type.

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Booleans

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Learn how to use JavaScript's boolean data type.

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Null and undefined values

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

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BigInt

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Learn how to use JavaScript's BigInt data type.

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Symbols

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Learn how to use JavaScript's symbol data type.

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Variables

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Learn how to use JavaScript variables.

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Comparison operators

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Learn how to use comparison operators.

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Control flow

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Learn about JavaScript's control flow.

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Introduction to functions

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An introduction to JavaScript functions.

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Function expressions

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An introduction to JavaScript function expressions.

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The "new" keyword

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

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The "return" keyword

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

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The "this" keyword

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

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Introduction to objects

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Introduction to JavaScript objects.

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Property accessors

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

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Prototypal inheritance

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JavaScript objects and prototypal inheritance.

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Property descriptors

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Use property descriptors to configure your JavaScript objects.

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Indexed collections

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Learn how to use indexed collections such as arrays.

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Keyed collections

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

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Introduction to classes

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Learn how to use classes in JavaScript.

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Extend classes

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

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Class fields and methods

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

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Static initialization blocks

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Use static initialization blocks to set or alter static fields.

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Appendix

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Additional information that might be helpful on your JavaScript journey.