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The 9th edition, or ECMAScript 2018, was finalized in June 2018. [7] New features include the spread operator and rest parameters (...) for object literals, asynchronous iteration, Promise.prototype.finally and additions to RegExp. [7] The spread operator allows for the easy copying of object properties, as shown below.
The ECMAScript specification is a standardized specification of a scripting language developed by Brendan Eich of Netscape; initially named Mocha, then LiveScript, and finally JavaScript. [7] In December 1995, Sun Microsystems and Netscape announced JavaScript in a press release. [ 8 ]
Variables in standard JavaScript have no type attached, so any value (each value has a type) can be stored in any variable. Starting with ES6, the 6th version of the language, variables could be declared with var for function scoped variables, and let or const which are for block level variables.
[7] [8] Babel plugins transform syntax that is not widely supported into a backward-compatible version. For example, arrow functions, which are specified in ES6, are converted into regular function declarations. [9] Non-standard JavaScript syntax such as JSX can also be transformed. [10] [11]
This is an accepted version of this page This is the latest accepted revision, reviewed on 15 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 ...
CommonJS's specification of how modules should work is widely used today for server-side JavaScript with Node.js. [1] It is also used for browser-side JavaScript, but that code must be packaged with a transpiler since browsers don't support CommonJS. [1]
The key to understanding design patterns such as IIFE is to realize that prior to ES6, JavaScript only featured function scope (thus lacking block scope), passing values by reference inside closures. [9] This is no longer the case, as the ES6 version of JavaScript implements block scoping using the new let and const keywords. [10]
Jint: Javascript interpreter with integrated engine for .NET; Narcissus: JavaScript implemented in JavaScript (a meta-circular evaluator), intended to run in another JavaScript engine, of theoretical and educational nature only. JS-Interpreter A lightweight JavaScript interpreter implemented in JavaScript with step-by-step execution.