The document outlines various features and enhancements introduced in different ECMAScript (ES) versions from ES6 (2015) through ES10 (2019). Key topics include arrow functions, classes, template strings, promises, and new array methods such as flat and flatMap. It serves as a quick reference for JavaScript developers to understand modern JavaScript capabilities.

1. ES6 ( 2015 )
(1) Arrow functions:
(2) Classes

2. ( Note: Below output is obtained on commenting person.greet() )
The ​static​ keyword defines a static method for a class. Static methods aren't called on instances
of the class. Instead, they're called on the class itself. These are often utility functions, such as functions to
create or clone objects.
[Ref(Classes) : ​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Class_fields​ ]

3. (3) Enhanced Object Literal
(a) Shorthand
(b) Computed Properties
(4) Template Strings
(5) Destructuring

4. (6) Default and Spread Operator
(7) Let
(8) Const
(9) for..of

5. (10) Generators
(11) Modules
(12) Map | Set

6. (13) Map and Weak Map
(14) Proxy
https://www.freecodecamp.org/news/a-quick-intro-to-javascript-proxies-55695ddc4f98/
(15) Object.asign()
(16) Promises

7. ES7 (2016)
(1) Array.prototype.include()
(2) Exponentiation Operator
ES8 (2017)
(1) Object.values()
(2) Object.entries()
(3) Object.getOwnPropertyDescriptors()

8. (4) Async | Await
(5) padStart | padEnd

9. (6) Trailing Comma
ES9 (2018)
(1) Regex Changes
( ​https://www.freecodecamp.org/news/es9-javascripts-state-of-art-in-2018-9a350643f29c/​ )
(2) Rest | Spread
(3) Finally ( Promise.prototype )

10. (4) Asynchronous Iterations
​ES10 (2019)
(1) Array.flat()
(2) Array.flatMap()

11. (3) Object.fromEntries()
(4) String.trimStart() | String.trimEnd()
(5) Optional Catch Binding