JavaScript-versioner

Indholdsfortegnelse

JavaScript blev opfundet af Brendan Eich i 1995, og blev en ECMA-standard i 1997.

ECMAScript er det officielle navn på sproget.

ECMAScript-versioner er blevet forkortet til ES1, ES2, ES3, ES5 og ES6.

Siden 2016 er versioner navngivet efter år (ECMAScript 2016, 2017, 2018, 2019, 2020).

Ver	Official Name	Description
ES1	ECMAScript 1 (1997)	First edition
ES2	ECMAScript 2 (1998)	Editorial changes
ES3	ECMAScript 3 (1999)	Added regular expressions Added try/catch Added switch Added do-while
ES4	ECMAScript 4	Never released
ES5	ECMAScript 5 (2009) Read More	Added "strict mode" Added JSON support Added String.trim() Added Array.isArray() Added Array iteration methods Allows trailing commas for object literals
ES6	ECMAScript 2015 Read More	Added let and const Added default parameter values Added Array.find() Added Array.findIndex()
	ECMAScript 2016 Read More	Added exponential operator (**) Added Array.includes()
	ECMAScript 2017 Read More	Added string padding Added Object.entries() Added Object.values() Added async functions Added shared memory Allows trailing commas for function parameters
	ECMAScript 2018 Read More	Added rest / spread properties Added asynchronous iteration Added Promise.finally() Additions to RegExp
	ECMAScript 2019 Read More	String.trimStart() String.trimEnd() Array.flat() Object.fromEntries Optional catch binding
	ECMAScript 2020 Read More	The Nullish Coalescing Operator (??)

Denne vejledning dækker alle versioner af JavaScript:

ECMAScript 1 - 6 er fuldt understøttet i alle moderne browsere.

* Internet Explorer 9 understøtter ikke ECMAScript 5 "brug streng".

Internet Explorer understøtter ikke ECMAScript 2015.