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JSX (JavaScript XML, formally JavaScript Syntax eXtension) is an XML-like extension to the JavaScript language syntax. [1] Initially created by Facebook for use with React, JSX has been adopted by multiple web frameworks.
"No New Features" enables gradual React updates from older versions. Add new JSX Transform, Changes to Event Delegation 18.0.0 29 March 2022 Concurrent React, Automatic batching, New Suspense Features, Transitions, Client and Server Rendering APIs, New Strict Mode Behaviors, New Hooks [65] 18.1.0 26 April 2022 Many fixes and performance ...
var x1 = 0; // A global variable, because it is not in any function let x2 = 0; // Also global, this time because it is not in any block function f {var z = 'foxes', r = 'birds'; // 2 local variables m = 'fish'; // global, because it wasn't declared anywhere before function child {var r = 'monkeys'; // This variable is local and does not affect the "birds" r of the parent function. z ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 7 March 2025. High-level programming language Not to be confused with Java (programming language), Javanese script, or ECMAScript. JavaScript Screenshot of JavaScript source code Paradigm Multi-paradigm: event-driven, functional, imperative, procedural, object-oriented Designed by Brendan Eich of ...
Ecma's Technical Committee 39 (TC39) is responsible for the maintenance of ECMAScript. [12] New proposals to the language go through a staged process, with each stage representing the completeness of the proposal's specification.
TypeScript was released to the public in October 2012, with version 0.8, after two years of internal development at Microsoft. [13] [14] Soon after the initial public release, Miguel de Icaza praised the language itself, but criticized the lack of mature IDE support apart from Microsoft Visual Studio, which was not available on Linux and macOS at the time.
Another key difference is the addressing of values. JSON has objects with a simple "key" to "value" mapping, whereas in XML addressing happens on "nodes", which all receive a unique ID via the XML processor. Additionally, the XML standard defines a common attribute xml:id, that can be used by the user, to set an ID explicitly.
In early May 2019, an update was deployed to Stack Overflow's development version. It contained a bug which allowed an attacker to grant themselves privileges in accessing the production version of the site.