state management

Build a state management system with vanilla JavaScript

Managing state is not a new thing in software, but it’s still relatively new for building software in JavaScript. Traditionally, we’d keep state within the DOM itself or even assign it to a global object in the window. Now though, we’re spoiled with choices for libraries and frameworks to help us with this. Libraries like Redux, MobX and Vuex make managing cross-component state almost trivial. This is great for an application’s resilience and it works really well with a state-first, reactive framework such as React or Vue.

How do these libraries work though? What would it take to write one ourselves? Turns out, it’s pretty straightforward and there’s an opportunity to learn some really common patterns and also learn about some useful modern APIs that are available to us.

(more…)

Managing State in React With Unstated

As your application becomes more complex, the management of state can become tedious. A component's state is meant to be self-contained, which makes sharing state across multiple components a headache. Redux is usually the go-to library to manage state in React, however, depending on how complex your application is, you might not need Redux.

Unstated is an alternative that provides you with the functionality to manage state across multiple components with a Container class and Provider and Subscribe components. Let's see Unstated in action by creating a simple counter and then look at a more advanced to-do application.

(more…)

Understanding React `setState`

React components can, and often do, have state. State can be anything, but think of things like whether a user is logged in or not and displaying the correct username based on which account is active. Or an array of blog posts. Or if a modal is open or not and which tab within it is active.

React components with state render UI based on that state. When the state of components changes, so does the component UI.

That makes understanding when and how to change the state of your component important. At the end of this tutorial, you should know how setState works, and be able to avoid common pitfalls that many of us hit when when learning React.

(more…)

Managing State in CSS with Reusable JavaScript Functions – Part 2

In my previous article, which shall now retroactively be known as Managing State in CSS with Reusable JavaScript Functions - Part 1, we created a powerful reusable function which allows us to quickly add, remove and toggle stateful classes via click.

One of the reasons I wanted to share this approach was to see what kind of response it would generate. Since then I've received some interesting feedback from other developers, with some raising valid shortcomings about this approach that would have never otherwise occurred to me.

In this article, I'll be providing some solutions to these shortcomings, as well as baking in more features and general improvements to make our reusable function even more powerful.

(more…)

icon-anchoricon-closeicon-emailicon-linkicon-logo-staricon-menuicon-nav-guideicon-searchicon-staricon-tag