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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).
Some naming conventions limit whether letters may appear in uppercase or lowercase. Other conventions do not restrict letter case, but attach a well-defined interpretation based on letter case. Some naming conventions specify whether alphabetic, numeric, or alphanumeric characters may be used, and if so, in what sequence.
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 World Wide Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.
CSS-in-JS is a styling technique by which JavaScript is used to style components. When this JavaScript is parsed, CSS is generated (usually as a <style> element) and attached into the DOM. It enables the abstraction of CSS to the component level itself, using JavaScript to describe styles in a declarative and maintainable way.
Syntax highlighting Content assist Compiler mod_less: Apache2 module to compile Less on the fly: Open Source: Linux: Compiler grunt-contrib-less: Node.js Grunt task to convert Less to CSS: MIT [14] Node.js: Compiler Web Essentials: Visual Studio extension with support for Less and Sass: Apache 2.0 [15] Windows: Syntax highlighting, Content ...
Reason was originally compiled to JavaScript using the BuckleScript compiler, [7] which was created at Bloomberg L.P. In 2020, the BuckleScript and Reason toolchain was rebranded to ReScript, essentially creating a separate language that had different syntax from Reason and only compiled to JavaScript. [8]
Lacking the distinct features of "usual" JavaScript, obfuscation techniques like JSFuck can assist malicious JavaScript code in bypassing intrusion prevention systems [17] or content filters. For instance, the lack of alphanumeric characters in JSFuck and a flawed content filter allowed sellers to embed arbitrary JSFuck scripts in their eBay ...
PureScript supports type-driven development via its typed holes feature, [19] in which a program can be constructed with missing subexpressions. The JavaScript transpiler will subsequently attempt to infer the types of the missing subexpressions, and report those types to the user. This feature has inspired similar work in the GHC Haskell ...