JavaScript | MDN (original) (raw)
Beginner's tutorials
Our learn web development core modules contain modern, up-to-date tutorials covering JavaScript fundamentals.
Your first website: Adding interactivity
This article provides a brief tour of what JavaScript is and how to use it, aimed at people who are completely new to web development.
Dynamic scripting with JavaScript
This module focuses on the essentials of the core JavaScript language, plus some key surrounding topics — learning these topics will give you a solid basis to work from.
JavaScript frameworks and libraries
JavaScript frameworks are an essential part of modern front-end web development, providing developers with tried and tested tools for building scalable, interactive web applications. Many modern companies use frameworks as a standard part of their tooling, so many front-end development jobs now require framework experience. This set of articles provides a comfortable starting point to help you begin learning frameworks.
JavaScript guides
Fundamental language guides
A much more detailed guide to the JavaScript language, aimed at those with previous programming experience either in JavaScript or another language.
Intermediate
The object-oriented nature of JavaScript is important to understand if you want to go further with your knowledge of the language and write more efficient code, therefore we've provided this module to help you.
In this module, we take a look at asynchronous JavaScript, why it is important, and how it can be used to effectively handle potential blocking operations, such as fetching resources from a server.
Explores what APIs are, and how to use some of the most common APIs you'll come across often in your development work.
An overview of the basic syntax and semantics of JavaScript for those coming from other programming languages to get up to speed.
Overview of available data structures in JavaScript.
Equality comparisons and sameness
JavaScript provides three different value comparison operations: strict equality using ===, loose equality using ==, and the Object.is() method.
Enumerability and ownership of properties
How different methods that visit a group of object properties one-by-one handle the enumerability and ownership of properties.
A closure is the combination of a function and the lexical environment within which that function was declared.
Advanced
Inheritance and the prototype chain
Explanation of the widely misunderstood and underestimated prototype-based inheritance.
Memory life cycle and garbage collection in JavaScript.
Reference
Browse the complete JavaScript reference documentation.
Get to know standard built-in objects: Array, Boolean, Error, Function, JSON, Math, Number, Object, RegExp, String, Map, Set, WeakMap, WeakSet, and others.
Learn more about the behavior of JavaScript's operators instanceof, typeof, new, this, the operator precedence, and more.
Learn how do-while, for-in, for-of, try-catch, let, var, const, if-else, switch, and more JavaScript statements and keywords work.
Learn how to work with JavaScript's functions to develop your applications.
JavaScript classes are the most appropriate way to do object-oriented programming.