--- title: "Experimentally Introducing Concurrent Mode" publication: "React Status" issue: 162 published_at: "2019-10-30" canonical_url: "https://react.statuscode.com/issues/162" --- This week's React news #162 — October 30, 2019 [Read on the Web](https://react.statuscode.com/issues/162) React Status Your weekly React news digest, every Wednesday [Experimentally Introducing _Concurrent Mode_](https://reactjs.org/docs/concurrent-mode-intro.html) — Unveiled at ReactConf comes a set of much awaited, new experimental features that will help apps stay responsive and gracefully adjust to the user’s device capabilities and network speed. The React team [notes](https://twitter.com/reactjs/status/1187412606014894080), however, that _“it’s very early and … primarily aimed at early adopters and people who are curious”._ React Team [A Side-by-Side Comparison of Jest, Testing Library and Cypress](https://t.co/HnhnMjTqay) — A comparison of three approaches to testing React apps by using each of them against the same app. Sunil Sandhu [![\](https://copm.s3.amazonaws.com/27f094d7.png)](https://www.telerik.com/kendo-react-ui/react-hooks-guide/?utm_medium=cpm&utm_source=reactstatus&utm_campaign=kendo-ui-react-blog-react-hooks-guide&utm_content=primary) [React Hooks Guide: See the In-depth Tutorials with Examples](https://www.telerik.com/kendo-react-ui/react-hooks-guide/?utm_medium=cpm&utm_source=reactstatus&utm_campaign=kendo-ui-react-blog-react-hooks-guide&utm_content=primary) — This guide serves as an exhaustive resource for learning the built-in Hooks that are now part of React. Learn all about them as we comprehensively cover: State and Effects, Context, Reducers, and Custom React Hooks. Start learning today. Progress KendoReact sponsor [SWR: React Hooks for Remote Data Fetching](https://swr.now.sh/) — Based upon the `stale-while-revalidate` caching strategy, _“SWR first returns the data from cache (stale), then sends the fetch request (revalidate), and finally comes with the up-to-date data again.”_ The result? Things will feel a lot faster UI-wise and the latest data will get used once it arrives. ZEIT ▶[The Complete React Conf 2019 Live Streams](https://www.youtube.com/watch?v=RCiccdQObpo) — You’ll want to wait a little longer for specific talk videos, but if you’re happy to dive through hours of livestreams, [day one](https://www.youtube.com/watch?v=RCiccdQObpo) and [day two](https://www.youtube.com/watch?v=JDDxR1a15Yo) are available. If you’re itching to watch some specific talks, jump straight to [Brian Vaughn’s talk](https://youtu.be/JDDxR1a15Yo?t=1923) on React Developer Tooling or [Becca Bailey’s talk](https://youtu.be/UxoX2faIgDQ?t=29108) on the state of React state. YouTube [Formik 2: React Form Building, Now Built on Hooks](https://github.com/jaredpalmer/formik/releases/tag/v2.0.1) — [Formik](https://jaredpalmer.com/formik/) is a popular helper library for working with forms in React apps. Version 2 is now out (2.0.3 to be specific) and it’s now built on top of hooks. Jared Palmer 💻 Jobs [Software Engineer / Founding Teammate](https://stackoverflow.com/jobs/282662/software-engineer-founding-teammate-markup) — A well funded, fast-moving startup that is changing the way large teams collaborate on documents. Think: GitHub for documentation. Markup [Have You Tried Vettery?](https://www.vettery.com/tech?utm_source=newsletter&utm_medium=cooper-reactstatus&utm_term=tech&utm_content=grouped&utm_campaign=ad-77585) — Vettery specializes in tech roles and is completely free for job seekers. Create a profile to get started. Vettery 📘 Tutorials and Stories [Why Is React Concurrent Mode Exciting?](https://hswolff.com/blog/why-is-react-concurrent-mode-exciting/) — If the news about ‘concurrent’ React featured at the top of this issue flew over your head a bit, Harry boils it down a bit more with an explanation and a [20 minute video tour.](https://www.youtube.com/watch?v=8_ZjNnUqarg) Harry Wolff [You’re Not Using ``?](https://medium.com/nmc-techblog/wait-youre-not-using-react-strictmode-a9713927a33b) — The majority of React developers don’t seem to be using `StrictMode`, but should you be considering it? In short, yes, particularly if you plan on using concurrent React (above). Matan Borenkraout [Test-Driven React: The Key to Joyful Coding is Faster Feedback](https://pragprog.com/book/tbreact/test-driven-react) The Pragmatic Bookshelf sponsor [A Whirlwind Tour of React State](https://www.robinwieruch.de/react-state) — Developing React apps (or even apps in general) is generally a matter of managing state. Robin looks at how React handles it and provides mechanisms for you to manage state in various ways. Robin Wieruch [Reducing Redux Boilerplate in TypeScript](https://warhol.io/blog/reducing-redux-boilerplate-in-typescript) Peter Kröner [Svelte vs React: Some First Impressions](https://medium.com/javascript-in-plain-english/svelte-vs-react-first-impression-1ce5d3ee6889) Murat Catal 🔧 Code and Tools [![\](https://res.cloudinary.com/cpress/image/upload/w_1280,e_sharpen:60/waj7cbc40wpud4h5j4dj.jpg)](https://github.com/atlassian/react-beautiful-dnd/releases/tag/v12.0.0) [react-beautiful-dnd 12.0: Accessible Drag and Drop for Lists](https://github.com/atlassian/react-beautiful-dnd/releases/tag/v12.0.0) — A very popular library gets a major update and now boasts 30% more performance, 40% less memory usage, and upgrades are safe for most existing users. Virtual lists are now also supporting opening the potential for working with _huge_ lists at silky smooth speeds. [README here.](https://github.com/atlassian/react-beautiful-dnd#readme) Atlassian [Redux Starter Kit 1.0 Released](https://blog.isquaredsoftware.com/2019/10/redux-starter-kit-1.0/) — A package designed to make it easier to get started with Redux and perform common tasks. Mark Erikson [Sell Your API-First Product to Millions of Developers](https://www.manifold.co/?utm_source=react_status&utm_medium=newsletter&utm_campaign=oct30) — One integration to distribute your products to the fastest growing platforms on the planet. Manifold sponsor [Downshift 3.4: Primitives to Build WAI-ARIA Compliant Enhanced Input Components](https://github.com/downshift-js/downshift) — _“You need an autocomplete/dropdown/select and you want it to be accessible. You also want it to be simple and flexible to account for your use cases.”_ Now supports Preact X as well as React. Downshift [An Auto-Height Webview for React Native](https://github.com/iou90/react-native-autoheight-webview) iou90 [Rodal: A React Modal with Animations](http://chenjiahan.github.io/rodal/) — Things like spinning into view, sliding in, fading, zooming, flipping, etc. I’m not a fan of modals but this is nicely understated and quick. neverland A **[Cooperpress](https://cooperpress.com/)** publication. [Change your email address](https://react.statuscode.com/edit_subscription/*|UID|*) or[Stop getting this newsletter](https://react.statuscode.com/leave/*|UID|*) © Cooper Press Ltd · Fairfield Enterprise Centre, Louth, LN11 0LS, United Kingdom