Ecma International approves ECMAScript 2022: What’s new?

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On 22 June 2022, the 123nd Ecma General Assembly approved the ECMAScript 2022 language specification, which means that it’s officially a standard now.This blog post explains what’s new.Table of contents:The editors of ECMAScript 2022  What’s new in ECMAScript 2022?  New members of classes  Private slot checks via the in operator  Top-level await in modules  error.cause  Method .at() of indexable values  RegExp match indices  Object.hasOwn(obj, propKey)  FAQ  What is the difference between JavaScript and ECMAScript?  Who designs ECMAScript? TC39 – Ecma Technical Committee 39  How are features added to ECMAScript? They go through the stages of the TC39 process  How important are ECMAScript versions?  How is [my favorite feature proposal] doing?  Where can I look up which features were added in a given ECMAScript version?  Free books on JavaScript  The editors of ECMAScript 2022  The editors of this release are:What’s new in ECMAScript 2022?  New members of classes  class MyClass { …