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JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t /), often abbreviated as JS, is a programming language and core technology of the Web, alongside HTML and CSS. 99% of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
The programming languages applied to deliver such dynamic web content vary vastly between sites. ... JavaScript, TypeScript: C, C++, Go, [3] Java, Python, Node:
The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output. The JavaScript standard library lacks an official standard text output function (with the exception of document.write).
Node.js is a cross-platform, open-source JavaScript runtime environment that can run on Windows, Linux, Unix, macOS, and more. Node.js runs on the V8 JavaScript engine, and executes JavaScript code outside a web browser. Node.js lets developers use JavaScript to write command line tools and for server-side scripting.
ECMAScript JavaScript supports C-style structured programming. Previously, JavaScript only supported function scoping using the keyword var, but ECMAScript 2015 added the keywords let and const, allowing JavaScript to support both block scoping and function scoping.
Toward this end, this WikiProject identifies, gathers, and rates all articles about JavaScript. It also identifies, gathers, and creates redirects to all article sections about JavaScript (for example, the links Comment (JavaScript) and Comments in JavaScript redirect to Comment (computer programming)#JavaScript). In addition, we identify gaps ...
Ajax is not a technology, but rather a programming concept. HTML and CSS can be used in combination to mark up and style information. The webpage can be modified by JavaScript to dynamically display (and allow the user to interact with) the new information.
JavaScript added support for async/await in 2017 as part of ECMAScript 2017 JavaScript edition. Rust added support for async/await with version 1.39.0 in 2019 using the async keyword and the .await postfix operator, both introduced in the 2018 edition of the language.