Welcome to the ES6 documentation page! Below you will find a comprehensive guide to the new features introduced in ECMAScript 6 (ES6). For more in-depth information, check out our ES6 Introduction.

Overview

ES6, also known as ECMAScript 2015, brought a host of new features to JavaScript, making it more concise, readable, and efficient. Here are some of the key features:

  • Let and Const: Introduced block-scoped variables to replace the problematic var keyword.
  • Arrow Functions: Simplified the syntax for writing functions.
  • Template Literals: Improved the way strings are handled in JavaScript.
  • Promises and Async/Await: Enhanced the handling of asynchronous code.
  • Modules: Introduced a new way to organize and share code.

Features in Detail

Let and Const

Let and const were introduced to address the issues with the var keyword. let allows you to declare block-scoped variables, while const is used to declare variables whose value should not change.

let x = 5;
const y = 10;

Arrow Functions

Arrow functions provide a more concise syntax for writing functions. They are often used in array methods and callbacks.

const numbers = [1, 2, 3];
const doubled = numbers.map(number => number * 2);

Template Literals

Template literals allow you to create multi-line strings and interpolate variables and expressions.

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

Promises and Async/Await

Promises and async/await make handling asynchronous code much easier. Promises are objects representing the eventual completion (or failure) of an asynchronous operation and its resulting value.

async function fetchData() {
  const data = await fetch('/api/data');
  const json = await data.json();
  return json;
}

Modules

Modules allow you to organize your code into separate files and import the necessary parts as needed.

// myModule.js
export const add = (a, b) => a + b;

// main.js
import { add } from './myModule.js';
const result = add(1, 2);

ES6 Logo

For more information on ES6, visit our ES6 documentation.