Versions of ECMAScript
Since the introduction of ECMAScript (ES), many versions of it have been released. While the first version released in 1997 and called ES1. Subsequently, ES2 was released in 1998. However, the next version, ES3 that came in 1999 has certain significant additions like advanced loops, try/catch block, and regular expressions. Significantly, the fourth edition, ES4 that came in 2003 was abondoned and never released.
Evidently, the fifth edition, ES5 was released after long time in December 2009 contains several new features. Particularly, ES5 includes JSON support, strict mode and several features of Array and String.
After that, the next edition ES6 came in 2015 and contains let and const. Afterwards, a new edition of ECMAScript appears every year and termed as ES2016, ES2017, ES2018, ES2019, and ES2020. While some new features become part of each edition.