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In computer science, futures, promises, delays, and deferreds are constructs used for synchronizing program execution in some concurrent programming languages.Each is an object that acts as a proxy for a result that is initially unknown, usually because the computation of its value is not yet complete.
This is an accepted version of this page This is the latest accepted revision, reviewed on 23 February 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 ...
First edition based on JavaScript 1.1 as implemented in Netscape Navigator 3.0. [1] Guy L. Steele Jr. 2 June 1998 Editorial changes to keep the specification fully aligned with ISO/IEC 16262:1998. Mike Cowlishaw: 3 December 1999 Based on JavaScript 1.2 as implemented in Netscape Navigator 4.0. [2]
In computational complexity theory, a promise problem is a generalization of a decision problem where the input is promised to belong to a particular subset of all possible inputs. [1] Unlike decision problems, the yes instances (the inputs for which an algorithm must return yes ) and no instances do not exhaust the set of all inputs.
Introduced in Python 2.2 as an optional feature and finalized in version 2.3, generators are Python's mechanism for lazy evaluation of a function that would otherwise return a space-prohibitive or computationally intensive list. This is an example to lazily generate the prime numbers:
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 ...
Internet Explorer 3.0: Netscape JavaScript: 1.0 2.0 Jan 1997 Windows IIS 3.0 Netscape JavaScript 1.1 3.0 Oct 1997 Internet Explorer 4.0: ECMA-262 1st edition [note 2] 1.3 4.0 Visual Studio 6.0 (as part of Visual InterDev) ECMA-262 1st edition 1.3 5.0 Mar 1999 Internet Explorer 5.0: ECMA-262 2nd edition 1.4 5.1 Internet Explorer 5.01 ECMA-262 ...
V8 from Google is the most used JavaScript engine. Google Chrome and the many other Chromium-based browsers use it, as do applications built with CEF, Electron, or any other framework that embeds Chromium. Other uses include the Node.js and Deno runtime systems. SpiderMonkey is developed by Mozilla for use in Firefox and its forks.