You dont know js scope closure
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On the JavaScript front, Microsoft reverse-engineered the Navigator interpreter to create its own, called JScript. Microsoft debuted Internet Explorer in 1995, leading to a browser war with Netscape. At the time, the dot-com boom had begun and Java was the hot new language, so Eich considered the JavaScript name a marketing ploy by Netscape to give its own new language cachet. The choice of the JavaScript name has caused confusion, implying that it is directly related to Java.
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Although the new language and its interpreter implementation were called LiveScript when first shipped as part of a Navigator beta in September 1995, the name was changed to JavaScript for the official release in December. Netscape management soon decided that the best option was for Eich to devise a new language, with syntax similar to Java and less like Scheme or other extant scripting languages. They pursued two routes to achieve this: collaborating with Sun Microsystems to embed the Java programming language, while also hiring Brendan Eich to embed the Scheme language. There was a desire in the burgeoning web development scene to remove this limitation, so in 1995, Netscape decided to add a scripting language to Navigator. ĭuring these formative years of the Web, web pages could only be static, lacking the capability for dynamic behavior after the page was loaded in the browser.
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Navigator quickly became the most used browser. The lead developers of Mosaic then founded the Netscape corporation, which released a more polished browser, Netscape Navigator, in 1994. As the first browser with a graphical user interface accessible to non-technical people, it played a prominent role in the rapid growth of the nascent World Wide Web. The Mosaic web browser was released in 1993. 5.4 Object-orientation (prototype-based).The most popular runtime system for this usage is Node.js.Īlthough there are similarities between JavaScript and Java, including language name, syntax, and respective standard libraries, the two languages are distinct and differ greatly in design. JavaScript engines were originally used only in web browsers, but they are now core components of some servers and a variety of applications. In practice, the web browser or other runtime system provides JavaScript APIs for I/O. The ECMAScript standard does not include any input/output (I/O), such as networking, storage, or graphics facilities. It has application programming interfaces (APIs) for working with text, dates, regular expressions, standard data structures, and the Document Object Model (DOM).
#YOU DONT KNOW JS SCOPE CLOSURE CODE#
All major web browsers have a dedicated JavaScript engine to execute the code on the user's device.Īs a multi-paradigm language, JavaScript supports event-driven, functional, and imperative programming styles. Over 97% of websites use it client-side for web page behavior, often incorporating third-party libraries.
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It has dynamic typing, prototype-based object-orientation and first-class functions.Īlongside HTML and CSS, JavaScript is one of the core technologies of the World Wide Web. JavaScript is high-level, often just-in-time compiled and multi-paradigm. JavaScript ( / ˈ dʒ ɑː v ə ˌ s k r ɪ p t/), often abbreviated as JS, is a programming language that conforms to the ECMAScript specification. TypeScript, CoffeeScript, AssemblyScript, ActionScript, Dart, Objective-J, Opa, Haxe