Welcome, dear readers, to another issue of Newbie Impressions, where I look at various programming-related tools I'm not familiar with and give out my honest first impressions.
Today's post one may call a continuation of my previous post concerning React.JS. React and Redux seems to be quite a popular combo on the Net.
But let's not get ahead of ourselves, shall we? I'd like to give just a bit of background first.
If you've coded any React (or read React.JS docs on state and lifecycle), you know that React is based upon describing your UI as a set of components. Each component has immutable properties and mutable state. When the state of a component is updated, it re-renders itself. Eventually, people have started extracting the state into a high-level component. It improves debugging, and also lets you control the data flow easier.
But, of course, thanks to React's flexibility, you can have multiple components on the same webpage. With it comes the problem of sharing state between those components. I believe it was this problem that prompted Facebook engineers to create Flux. I must admit, I have barely glanced at Flux, but it leaves an unnerving impression. You need to write quite a lot of boilerplate to use it. And that is exactly where Redux comes helpful.
Redux.js describes itself as something that "evolves the ideas of Flux, but avoids its complexity", and I'm inclined to agree. Even though the library makes you jump through some unfamiliar hoops, it feels easy to use, almost as easy as React itself.
When you want to modify a store in any way, you don't just change the underlying object. You send an action to a dispatcher, which calls the reducer, updates the store's state and notifies all subscribers that it has changed. Between the dispatcher and the reducer you can install middlewares, special functions that can perform logging or change the way your actions affect the store.
If it sounds simple, it's because, well, it is. Just like React, you can whip up a simple Hello World in Redux in a matter of seconds. And yet its modular design makes it immensely powerful.
Of course, like I said, there is some jumping through hoops. You need to understand the concept of single store. And as your domain grows, you'll need to learn the ways to split up your reducer into smaller functions and gather them together later. Even Dan Abramov, the author of Redux, wrote an article stating that it might be too complicated for your project.
I hope this article was useful. Thank you very much for reading!