Some developers prefer the stability and more universal character of Sass over the novelty of styled-components. But if you’re willing to climb the steeper learning curve, styled-components offers more in the way of reusability and customization.

We attempt to demystify JavaScript’s this keyword and, in doing so, help you practice debugging issues that would otherwise be quite complex.

Closures are a widely discussed topic in the world of functional programming, but they’re often defined loosely and in technical jargon. We’ll do our best here to explain how JavaScript closures work in layman’s terms.

JavaScript keyed collections are structured collections of data that store values and provide methods for easily accessing them. In this guide, we’ll take a closer look at maps and sets and examine their syntax, how they differ from objects and arrays, and what methods they offer.

This tutorial explains the importance of design patterns in a modern codebase; demonstrates how to implement the observer, builder, and prototype design patterns in TypeScript; and breaks down the concept behind each pattern.

This tutorial demonstrates how to test your React functional components and the state changes for components that use hooks, with Jest and Enzyme as testing libraries.

Metaprogramming is a powerful technique that enables you to write programs that can create other programs. Learn how ES6 proxies make it easier to perform metaprogramming in JavaScript.

This tutorial demonstrates how to use JavaScript symbols to define unique property values as well as keys for identifying object properties.