#state management

Jotai is a state management library. We have been developing it primarily for React, but it's conceptually not tied to React. It this talk, we will see how Jotai atoms work and learn about the mental model we should have. Atoms are framework-agnostic abstraction to represent states, and they are basically just functions. Understanding the atom abstraction will help designing and implementing states in your applications with Jotai

Can useEffect affect your codebase negatively? From fetching data to fighting with imperative APIs, side effects are one of the biggest sources of frustration in web app development. And let’s be honest, putting everything in useEffect hooks doesn’t help much. In this talk, we'll demystify the useEffect hook and get a better understanding of when (and when not) to use it, as well as discover how declarative effects can make effect management more maintainable in even the most complex React apps.

Starbeam is a library for building reactive data systems that integrate natively with UI frameworks such as React, Vue, Svelte or Ember. In this talk, Yehuda will announce Starbeam. He will cover the motivation for the library, and then get into the details of how Starbeam reactivity works, and most importantly, how you can use it to build reactive libraries today that will work natively in any UI framework. If you're really adventurous, he will also talk about how you could use Starbeam in an existing app using your framework of choice and talk about the benefits of using Starbeam as the state management system in your application.

An increasing amount of data in our React applications is coming from remote and asynchronous sources and, even worse, continues to masquerade as "global state". In this talk, you'll get the lowdown on why most of your "global state" isn't really state at all and how React Query can help you fetch, cache and manage your asynchronous data with a fraction of the effort and code that you're used to.

Managing state in React is complicated. Humans are even more complicated. As developers, it's our job to deliver seamless and intuitive user experiences, but the sheer complexity of human behavior and the real world can make this harder than it should be. In this talk, we'll explore a radical new approach to app development where language models (LLMs) and reinforcement learning (RL) can be used to handle app logic in a more intelligent and human-centric way. We're bringing artificial intelligence to state management in ways that go much, much further than "call the OpenAI API and hope for the best". You will learn how you can leverage AI in your existing React apps to create the best UX possible, and peer into the future of AI agents.

Local-first is a new paradigm for developing apps with instant reactivity, realtime multi-user and conflict-free offline built in. This talk shows how to develop local-first systems with React using ElectricSQL, a open source software platform from the inventors of CRDTs.

Redux Toolkit 2.0 is here! Find out what's changedand why, the work that's gone into repackaging the Redux libraries, an overview of new features and breaking changes, and a look at future plans.

We spend a lot of time discussing which state library we should use, and fair. There are quite a few, from the common one everyone uses and loves to hate on, to that one quirky alternative, to several up and comers. However, discussing which library is best puts the cart before the horse.

When figuring out how to handle state, we should first ask ourselves: what different categories of state do we need? What are the constraints of each category? How do they relate to each other? How do they relate to the outside world? How do we keep them from becoming a giant, brittle ball of yarn? And more.

This might sound overwhelming, but never fear! In this talk, I'll walk you through how to answer these questions, and how craft an approachable, maintainable, and scalable state system. And yes, I will talk about how to pick a state management library too.

In this talk, we will explore how Valtio can simplify your React state management by providing a minimalist and performant solution. We will cover the basics of Valtio, including how to create and update a store and how to access and modify the store from your components. We will also dive into some advanced Valtio features, such as subscribing to changes in the store, andusing memoization to optimize your components' performanc. By the end of this talk, you will have a solid understanding of how Valtio can make your state management more efficient and effective, allowing you to create scalable and maintainable applications.

What is suspense for data fetching in React? Why does React's model make creating network requests during render so difficult? Why does (to the presenter's knowledge) no library besides Relay support this, despite its sheer convenience?
In this talk, Robert will discuss how React renders components (especially with regards to Suspense), and how to build a data-fetching library that functions correctly in light of those behaviors. Then, with all the pieces in place, we'll use a library, @boulton/react-disposable-state, to roll our own suspense-compatible data fetching!

Redux Toolkit 2.0 is coming Soon (TM)! Find out what's changing and why, the work that's gone into repackaging the Redux libraries, an overview of new features and breaking changes, and the latest status on the release plans.

This talk is about how React Query can simplify data management in React applications. The talk covers the basics of React Query, including its features for fetching and updating data, handling optimistic updates, composing queries and mutations, and managing errors and retries. By the end of the talk, attendees will have a clear understanding of how React Query can improve the user experience and reduce boilerplate in their React applications.

Users have come to expect real-time collaboration from best-in-class apps like Notion or Figma. But widely available tools and infrastructure for building multiplayer apps are only just emerging. In this talk, we’ll explore the open-source framework Jazz and the two new ideas powering it: Conflict-free Replicated Data Types (CRDTs) and verifiable permissions. By building a whole app with nothing but React and Jazz, we’ll see how this new approach radically simplifies building not only real-time multiplayer apps, but any kind of app in which users interact.

NextJS 13.4 changed the game with the App Router and React Server components. The change to the state management model looks simple to start, but gets complex very quickly as you try to create the practical every-day user experiences that were straightforward in the pages model. We'll talk about the different state management models, how they work in the App Router, and how to decide which you should use.

In this talk, I'll explain React Query from a different perspective. After having maintained React Query for over two years and having answered many questions (often the same ones multiple times), I feel like there might be a fundamental understanding missing about the lib. I'll start with a quick introduction about my journey into open source and how I got to know React Query, followed by showing which mindset change is beneficial when working with React Query - how to "think in React Query". I'll have 3 major takeaways: 1) React Query is not a data fetching library It's an async state manager, we'll quickly talk about what makes a state manager, why React Query is one and what "async state" means. 2) staleTime is your best friend I've seen a bit of confusion about how to use React Query as a state manager, so I'll explain why setting staleTime is mostly all you need 3) parameters are dependencies This is important to understand to show the boundaries between client state and server state, and is essential when doing state management with React Query I will then end with a note on "separation of concerns" and about the tradeoffs of just calling `useQuery` wherever you need it in your component tree.

A lot of React applications out there run for state management solutions such as Redux or Mobx and use it mostly for server side state like 'isLoading', 'isError', etc. We need to stop mixing between server state and client state. Don't get me wrong, client state is important, but 70% of the state is actually a server state. In this talk I will demonstrate how we can encapsulate server state using our own custom hook or using a (perfect) solution such as react-query.

Forms are a core part of many applications and complex actions are often broken up into multiple forms as steps in this workflow. Using React’s Context API and a conventional state machine, we can build a reusable system for building these wizards and make the web a bit more magical.

If you’ve worked with the React useState hook before, you might have wondered why global state management can’t be just as easy. Why do we still need so much boilerplate to manage state with the Context API? What if we don’t want to be constrained opinionated tools like Redux Toolkit or forced to use actions and reducers in our React applications? This is where Hookstate comes in. Hookstate is not just another state management solution. Apart from being feature-rich, fast, and flexible, the library takes the idea of simplifying state management in React apps to a whole new level. In this talk, I’ll introduce Hookstate as a simple and efficient state management solution for React applications.

A group of volunteers all over the world is working on React and React Native apps for the ADHD America program (non-for profit organization). In our work we use Recoil - quite a new React state management tool that looks quite promising. I'll show how we use it in both apps - for web and for mobile and explain why we decided to try it.

One of the biggest pain points when developing an app is the tricky business of managing state, race conditions, etc. Finite state machines can help eliminate such bugs entirely while providing a welcome, structured way to build components. Looks cool? Let’s build one, it’s even cooler!

The Vue 3 Reactivity and Composition API offers developers flexible techniques to work with reactive data. They enable a new and modern approach to handling State Management. Developers can now effortlessly implement local and global stores. Vuex has been one of the most used First-party plugins for Vue 2. Let's have a look at the advantages and tradeoffs of using Composables instead of Vuex.

If you must have legacy code, you want it written in statecharts. We'll break down the mental models required for understanding unfamiliar UI code, and compare the maintenance costs with and without statecharts.

State machines and statecharts can seem intimidating. Especially if you (like me!) didn’t study computer science, aren’t big into maths, or just haven’t come across state machines and statecharts before.
In this session, you’ll get a whirlwind introduction to state machines and statecharts, no prior knowledge and no coding experience required. Are you already familiar with state machines and statecharts but want to get a better understanding of the benefits and how to convince your team to get onboard? That’ll be covered too.
You could be a developer, designer, project manager, multi-disciplinarian or fancy specialist, I believe everyone can get something out of this talk, so join me!

Over the past few years, state machines, statecharts, and the actor model have proven to be viable concepts for building complex application logic in a clear, visual way with XState. In this talk, we'll take a peek into the future of XState, including new features in the next version, and new tools and services that will make it even easier to create and collaborate on state machines.

With so many libraries to choose from for state management, why not add one more? The ECMAScript Proxy API enables you to intercept and redefine how an object operates. Let's explore how you might use the Proxy API for state management!

Learn about state modeling with state machines and statecharts can improve the way you develop application logic, and get a sneak peek of never-before-seen upcoming visual tools that will take state management to the next level.

Learn about state modeling with state machines and statecharts can improve the way you develop your React applications, and get a sneak peek of never-before-seen upcoming visual tools that will take state management to the next level.