12 September 2023
JavaScript has evolved significantly since the ES6 update in 2015. ES6+ introduced major new syntax, capabilities, and paradigms to the language. This article will teach you modern JavaScript styles, best practices, and key ES6+ features to master. This is part of a series that relates to our popular course Clean Code with Javascript training.
ES6 added many new capabilities to JavaScript:
Arrow functions provide a concise syntax and implicit returns:
// ES5
function sum(a, b) {
return a + b;
}
// ES6
const sum = (a, b) => a + b;
ES6 classes provide object-oriented capabilities:
class User {
constructor(name) {
this.name = name;
}
printName() {
console.log(this.name);
}
}
Template literals provide an easy way to interpolate strings:
const name = 'John';
// ES6
console.log(`Hello ${name}!`)
Destructuring allows concisely extracting values from objects/arrays:
// ES6
const { name, age } = user;
const [first, second] = [1, 2];
Modern JS has added more features:
Async/await provides an easier way to work with async code:
async function init() {
const data = await fetch(url);
console.log(data);
}
Optional chaining allows access to nested properties if they exist:
const user = {
address: {
street: 'Main St'
}
};
console.log(user?.address?.street);
Some modern JavaScript styles include:
Use async/await instead of callbacks for readability.
Use pure functions, avoid side effects, immutable data.
React to state changes and asynchronous data flows.
Modern JavaScript leverages new tools and practices like:
Encapsulate code into reusable modules that can be imported.
TypeScript adds types to JavaScript for easier scaling.
JSX allows writing HTML-like syntax in React code.
Use ESLint and Prettier to enforce code quality and style.
Learning modern ES6+ JavaScript syntax and styles will make you a more effective developer. This article summarized some key capabilities to learn. Dive deeper into each topic and leverage modern tools to build better applications.
f you enjoyed this article you might be interested in our article Clean Code JavaScript: 5 Best Practices for Readable Code
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Clean Code with JavaScript - 2 days
This course focuses specifically on writing clean, maintainable code with JavaScript. Through hands-on exercises, you will learn principles like:
The instructor will demonstrate refactoring messy code into well-structured, legible code. You'll learn JavaScript-specific standards like Airbnb's style guide.
Other courses that may be of interest are
This advanced JavaScript course builds on basic knowledge to cover advanced topics like OOP, design patterns, ES6/ES7 features, module loaders, build tools, testing and more. Gain skills to develop complex JavaScript applications.
This introduction to ECMAScript 6/ES6 training covers the major features of the ES6 JavaScript specification. Learn syntax for variables, arrow functions, classes, promise handling, iterators, generators and more.
This comprehensive Node.js course teaches building web servers and applications with Node. Covers modules, npm, Express, MongoDB/database integration, microservices, testing, deployment and more through hands-on labs.
This practical React training course teaches building dynamic web UIs with React. Learn key concepts like components, JSX, state management, Hooks API, React Router, testing and more through real-world examples and labs.
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