Virtualized Rendering From Scratch in React

Virtualized Rendering From Scratch in React

Today, I’ll explain what I created back then in ActionScript 3.0. Let’s understand how virtualization rendering from scratch in React.

Many years ago, I was part of a development team that was creating a Flash application that had to render a lot of data. We struggled with rendering it as a list. Scrolling the list was sluggish, but I managed to come up with a solution.

Today, I’ll explain what I created back then in ActionScript 3.0. Needless to say, we will use JavaScript instead. We’ll create a pretty advanced demo and I’ll guide you through all the steps so you’ll get a solid understanding of the logic behind this very performant solution. Rendering millions of items (!) is no problem. We will get to that in the end.

I’m aware there exist third-party solutions such as the popular react-virtualized. But learning how to create virtualization yourself is a useful exercise in my opinion. Not only will you be able to customize every single aspect of the final component, but you’ll also understand all the small parts of it, which will help you in your journey to becoming the best developer you can possibly be.

Before we write some code, a few words about virtualization.

javascript

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