Here are the key features introduced in ES6 (ECMAScript 2015) with detailed descriptions and examples:

1. Block-Scoped Variables (let and const):

let: Declares variables with block scope, meaning they’re only accessible within the block where they’re declared (e.g., within an if statement or a loop).

JavaScript

if (true) {
  let x = 10;
}
console.log(x); // ReferenceError: x is not defined

const: Declares variables that cannot be reassigned after their initial assignment.

JavaScript

const PI = 3.14159;
PI = 2.5; // Error: Assignment to constant variable

2. Arrow Functions:

Concise way to write functions with implicit this binding and optional return expressions.

JavaScript

const add = (a, b) => a + b;
const greet = (name) => console.log(`Hello, ${name}!`);

3. Template Literals:

Tagged templates for string interpolation and multi-line strings.

JavaScript

const name = "John";
const age = 30;
const message = `Hello, ${name}! You are ${age} years old.`;

4. Destructuring:

Extract values from arrays and objects into distinct variables.

JavaScript

const person = { name: "Alice", age: 30 };
const { name, age } = person;

5. Classes:

Blueprints for creating objects with a more structured approach.

JavaScript

class Person {
  constructor(name, age) {
    this.name = name;
    this.age = age;
  }
  greet() {
    console.log(`Hello, my name is ${this.name}!`);
  }
}

6. Modules:

System for organizing code into reusable modules.

JavaScript

// math.js
export const PI = 3.14159;
export function square(x) {
  return x * x;
}

7. Default Parameters:

Assign default values to function parameters.

JavaScript

function greet(name = "World") {
  console.log(`Hello, ${name}!`);
}

8. Rest Parameter (…):

Collects remaining arguments into an array.

JavaScript

function sum(...numbers) {
  return numbers.reduce((total, num) => total + num, 0);
}

9. Spread Operator (…):

Expands iterables into individual elements.

JavaScript

const numbers = [1, 2, 3];
const newNumbers = [...numbers, 4, 5];

10. Promises:

Handle asynchronous operations more elegantly.

JavaScript

fetch('https://api.example.com/data')
  .then(response => response.json())
  .then(data => console.log(data))
  .catch(error => console.error(error));

Learning Resources:

If you’re interested in learning more about ES6, here are some helpful resources:

• Mozilla Developer Network: https://developer.mozilla.org/en-US/docs/Web/JavaScript
• JavaScript ES6 Tutorial: https://www.programiz.com/javascript/ES6
• Interactive ES6 Tutorial: https://support.khanacademy.org/hc/en-us/community/posts/4418180684045-JavaScript-ES6-support-MUST-be-implemented-