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JavaScript ( / ˈdʒɑːvəskrɪpt / ), 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 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 ).
JavaScript supports automatic semicolon insertion, meaning that semicolons that normally terminate a statement in C may be omitted in JavaScript. [16] Like C-style languages, control flow is done with the while, for, do / while, if / else, and switch statements. Functions are weakly typed and may accept and return any type.
Influenced by. JavaScript and XML. Ajax (also AJAX / ˈeɪdʒæks /; short for " A synchronous J avaScript a nd X ML " or " A synchronous Ja vaScript transfer ( x -fer)" [ 1][ 2]) is a set of web development techniques that uses various web technologies on the client-side to create asynchronous web applications. With Ajax, web applications can ...
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. [ 2]: 5 [ 3]: 11 Being a syntactic sugar, JSX is generally transpiled into nested JavaScript function calls structurally ...
JSON ( JavaScript Object Notation, pronounced / ˈdʒeɪsən / or / ˈdʒeɪˌsɒn /) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and arrays (or other serializable values).
JavaScript library. A JavaScript library is a library of pre-written JavaScript code that allows for easier development of JavaScript-based applications, [ 1] especially for AJAX and other web-centric technologies. [ 2] They can be included in a website by embedding it directly in the HTML via a script tag.
Influenced. AtScript, AssemblyScript, ArkTS. TypeScript is a free and open-source high-level programming language developed by Microsoft that adds static typing with optional type annotations to JavaScript. It is designed for the development of large applications and transpiles to JavaScript. [ 6]