What new features of ECMAScript 6 (ES6) are you familiar with?

• let and const for block scope of variables.
• Arrow functions (=>) for concise syntax and lexical this.
• Classes (class) for object-oriented programming.
• Template strings (backticks `) for string interpolation and multi-line strings.
• Destructuring assignment for extracting values from arrays and objects.
• Default parameters in functions.
• Rest parameters (...rest) and spread operator (...arr, {...obj}).
• Promises for asynchronous operations.
• Modules (import, export) for code organization.
• Map and Set for data collections.
• Symbols (Symbol) for unique object property identifiers.
• Generators (function*) and iterators.

// Example of let and const
let counter = 0;
const PI = 3.14;

// Example of arrow function
const add = (a, b) => a + b;

// Example of template string
const greeting = `Hello, world!`;

// Example of destructuring assignment
const person = { name: 'Ivan', age: 30 };
const { name, age } = person;

// Example of a promise
new Promise((resolve, reject) => {
  // asynchronous operation
  resolve('Done');
});