![]() Screenshot of JavaScript source code | |
Paradigm | Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented programming |
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Designed by | Brendan Eich of Netscape initially; others have also contributed to the ECMAScript standard |
First appeared | December 4, 1995[1] |
Stable release | ECMAScript 2021[2] ![]() |
Preview release | ECMAScript 2022[3] ![]() |
Typing discipline | Dynamic, weak, duck |
Filename extensions |
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Website | www |
Major implementations | |
V8, JavaScriptCore, SpiderMonkey, Chakra | |
Influenced by | |
Java,[5][6] Scheme,[6] Self,[7] AWK,[8] HyperTalk[9] | |
Influenced | |
ActionScript, AssemblyScript, CoffeeScript, Dart, Haxe, JS++, Objective-J, Opa, TypeScript | |
|
JavaScript (/ˈdʒɑːvəskrɪpt/),[10] often abbreviated JS, is a programming language that is one of the core technologies of the World Wide Web, alongside HTML and CSS.[11] As of 2022, 98% of websites use JavaScript on the client side for web page behavior,[12] often incorporating third-party libraries.[13] All major web browsers have a dedicated JavaScript engine to execute the code on users' devices.
JavaScript is a high-level, often just-in-time compiled language that conforms to the ECMAScript standard.[14] It has dynamic typing, prototype-based object-orientation, and first-class functions. It is multi-paradigm, supporting event-driven, functional, and imperative programming styles. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM).
The ECMAScript standard does not include any input/output (I/O), such as networking, storage, or graphics facilities. In practice, the web browser or other runtime system provides JavaScript APIs for I/O.
JavaScript engines were originally used only in web browsers, but are now core components of some servers and a variety of applications. The most popular runtime system for this usage is Node.js.
Although Java and JavaScript are similar in name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design.
Eich: The immediate concern at Netscape was it must look like Java.
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was invoked but never defined (see the help page).Eich: "function", eight letters, I was influenced by AWK.
JavaScript is part of the triad of technologies that all Web developers must learn: HTML to specify the content of web pages, CSS to specify the presentation of web pages, and JavaScript to specify the behavior of web pages.
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was invoked but never defined (see the help page).lib_usage
was invoked but never defined (see the help page).