codesanitize

Here are the key features introduced in ES9 (ECMAScript 2018), with detailed descriptions and examples: 1. Rest/Spread Properties: JavaScript JavaScript 2. Asynchronous Iteration: JavaScript 3. Promise.prototype.finally(): JavaScript 4. RegExp Named Capture Groups: JavaScript 5. RegExp Lookbehind Assertions: JavaScript 6. RegExp dotAll Flag (s): JavaScript 7. Object.fromEntries(): JavaScript