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MDN Web Docs, previously Mozilla Developer Network and formerly Mozilla Developer Center, is a documentation repository and learning resource for web developers. It was started by Mozilla in 2005 [ 2 ] as a unified place for documentation about open web standards, Mozilla's own projects, and developer guides.
The engine powers the Firefox web browser and has used multiple generations of JavaScript just-in-time (JIT) compilers, including TraceMonkey, JägerMonkey, IonMonkey, and the current WarpMonkey. It is the first JavaScript engine , written by Brendan Eich at Netscape Communications, and later released as open source and currently maintained by ...
In JavaScript, there are 7 primitive data types: string, number, bigint, boolean, symbol, undefined, and null. [19] Their values are considered immutable. These are not objects and have no methods or properties; however, all primitives except undefined and null have object wrappers. [20]
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 ...
String manipulation using regular expressions; Functions and operators for manipulating dates, times, and durations; Multiple output documents; Grouping (creating hierarchic structure from flat input sequences) A richer type system and stronger type checking; XSLT 3.0: became a W3C Recommendation on 8 June 2017. The main new features are: [14]
This version introduces the toSorted, toReversed, with, findLast, and findLastIndex methods on Array.prototype and TypedArray.prototype, as well as the toSpliced method on Array.prototype; added support for #! shebang comments at the beginning of files to better facilitate executable ECMAScript files; and allowed the use of most Symbols as keys ...
MDN Web Docs (formerly Mozilla Developer Network), a Mozilla website for developer documentation Message Disposition Notification, a form of return receipt for e-mail Telephone number for mobile devices, as in:
Rhino converts JavaScript scripts into classes. Rhino works in both compiled and interpreted mode. It is intended to be used in desktop or server-side applications, hence there is no built-in support for the Web browser objects that are commonly associated with JavaScript. Rhino can be used as a debugger by using the Rhino shell. The JavaScript ...