JavaScript's this keyword is confusing at the best of times. But what if I told you that 99% of the time, five simple rules are all you need to use this like a pro?

Pseudo-selectors like :hover can make a huge impact on user experience, but they haven't composed well with React – until now!

Redux stores and RxJS Observables both have a subscribe method with a similar signature – but are they really the same thing?

It's been a big year for Frontend Armory – with new lessons, code, videos, a new mission and a new price.

Learn about effects – a declarative approach to interacting with the world outside your app. With live demos, interactive exercises, and fractals.

Custom hooks are like mixins: they're a great way to share stateful and side-effectful functionality between components.

React's eaglerly awaited Concurrent Mode can vastly improve user experience, but it requires a stricter way of writing components.

Learn to create a simple React/Redux integration using Hooks, then improve the performance using JavaScript Proxies.

Even old-school class components allow you to compose component state. Hooks just make your life far, far simpler.