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Here are the key features introduced in ES13 (ECMAScript 2022), with detailed descriptions and examples: 1. Class Fields: JavaScript 2. Class Field Declarations: JavaScript 3. Private Fields: JavaScript 4. Private Methods: JavaScript 5. Ergonomic Brand Checks for Private Fields: JavaScript 6. Top-Level await: JavaScript 7. String.prototype.replaceAll(): JavaScript 8. Error Cause: JavaScript Remember: ES13 is relatively new, so browser support might vary. Check compatibility before using these features in production.

Here are key features introduced in ES10 (ECMAScript 2019) with detailed descriptions and examples: 1. Array.flat() and Array.flatMap(): JavaScript JavaScript 2. Object.fromEntries(): JavaScript 3. String.trimStart() and String.trimEnd(): JavaScript 4. Symbol.description: JavaScript 5. Optional Catch Binding: JavaScript 6. JSON Superset: JavaScript 7. BigInt Primitive: JavaScript 8. Dynamic Import: JavaScript Note: These features continue JavaScript’s evolution, offering more concise syntax, enhanced array and object manipulation, error handling, and data representation capabilities.