Tag: web design

Primitive data types, values, objects and references are among the most misunderstood topics in JavaScript. They can cause a lot of headaches. In this tutorial, you will learn about primitive data types, values, objects, references, the differences between them and how they work.

In JavaScript, it is possible to freeze an object, to make it immutable, and prevent it from being changed. This tutorial will show you how to do it. You will learn how to freeze an object in JavaScript with Object.freeze(), seal it with Object.seal(), prevent extending it and more.

The JavaScript ES2017 specification (ES8) has been around for a while. Many of the features introduced in this spec are very useful. Most of them are also well supported and safe to use. In this tutorial, you will learn a bit about what are the ES2017 features, how they work, and how to use them.

The ES2018 specification introduced four new features. These features are asynchronous iteration, rest/spread properties, Promise.prototype.finally() and regular expression improvements. This tutorial will help you learn how these ES2018 features work and how to use them.

The ES2019 specification may have been a smaller addition to JavaScript, but it still brought some interesting features. This tutorial will show you eight ES2019 features that can make your life easier. These features include trimStart(), trimEnd(), flat(), flatMap(), Object.fromEntries() and more.

The ES2020 specification brought many interesting features. In this tutorial, you will learn about seven ES2020 features that attracted the most attention: BigInt, matchAll(), globalThis, dynamic import, Promise.allSettled(), optional chaining and nullish coalescing operator.