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JavaScript Paradigm event-driven ,  functional ,  imperative Designed by Brendan Eich  initially, plus other key contributors to the  ECMAScript  specification First appeared December 4, 1995 ; 25 years ago [1] Stable release ECMAScript 2020 [2]  / June 2020 ; 10 months ago Preview release ECMAScript 2021 Typing discipline Dynamic ,  weak ,  duck Filename extensions .js .cjs .mjs [3] Major  implementations V8 ,  JavaScriptCore ,  SpiderMonkey ,  Chakra Influenced by Java , [4] [5]   Scheme , [5]   AWK , [6]   HyperTalk [7] Influenced TypeScript ,  CoffeeScript ,  AssemblyScript ,  ActionScript ,  Dart ,  Objective-J ,  Opa ,  Haxe   JavaScript  at Wikibooks JavaScript   ( / ˈ dʒ ɑː v ə ˌ s k r ɪ p t / ), [8]   often abbreviated as   JS , is a   programming language   that conforms to the   ECMAScript   specification. [9]   JavaScript is   high-level , often   just-in-time compiled , and   multi-paradigm . It has   curly-bracket syntax ,   dynamic typing ,   prototype-based   object-ori