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Junior Software Engineer focused on building scalable web and mobile applications with React, React-native, Next.js, and Express.js.

mdimran.swe@gmail.com

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# JavaScript ES6 Features | Md Imran Hossain - Web Developer

javascript#javascript#programming#career#javascriptes6

# JavaScript ES6 Features

Md Imran Hossain

Published on September 20, 2024

2 min read

JavaScript ES6 Features

ES6 (ECMAScript 2015) introduced several powerful features that make JavaScript more modern and easier to work with. Below are some of the key features:

1. Let and Const

let: Block-scoped variable declaration, used for variables that can be reassigned.
const: Block-scoped variable declaration for variables that should not be reassigned.

2. Arrow Functions

A shorter syntax for writing functions. It lexically binds the this context, which is useful in callbacks.

3. Template Literals

Template strings that allow embedding expressions and multiline strings using backticks (`).

4. Destructuring Assignment

Simplifies extracting values from arrays or objects into distinct variables.

5. Default Parameters

Allows parameters to have default values if no value is passed.

6. Spread and Rest Operators

Spread (...): Expands an array or object into individual elements.
Rest (...): Collects all remaining elements into an array.

7. Classes

A syntactic sugar for constructor functions and prototype-based inheritance.

8. Promises

Provides a cleaner way to handle asynchronous operations.

9. Modules

ES6 introduced a native module system for importing and exporting code between files.

10. Enhanced Object Literals

Shorthand for defining properties and methods in objects.

These ES6 features greatly improve code readability, maintainability, and ease of use.

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let name = "John"; // Can be reassigned
const age = 25; // Cannot be reassigned

const add = (a, b) => a + b;

const greeting = `Hello, ${name}!`;

// Array destructuring
const [x, y] = [1, 2];

// Object destructuring
const { name, age } = { name: 'John', age: 25 };

function greet(name = 'Guest') {
    return `Hello, ${name}`;
}

// Spread
const arr = [1, 2, 3];
const newArr = [...arr, 4, 5];

// Rest
function sum(...numbers) {
    return numbers.reduce((a, b) => a + b, 0);
}

class Person {
    constructor(name, age) {
        this.name = name;
        this.age = age;
    }

    greet() {
        console.log(`Hello, my name is ${this.name}.`);
    }
}

const john = new Person('John', 25);
john.greet(); // Hello, my name is John.

const fetchData = new Promise((resolve, reject) => {
    setTimeout(() => resolve('Data fetched!'), 1000);
});

fetchData.then((data) => console.log(data)).catch((error) => console.error(error));

// Exporting (file: math.js)
export const add = (a, b) => a + b;

// Importing (file: app.js)
import { add } from './math';
console.log(add(2, 3)); // 5

const name = 'John';
const person = {
    name, // Shorthand for name: name
    greet() { // Shorthand for greet: function() {}
        console.log('Hello');
    }
};