RxJS is a JavaScript library for reactive programming using Observables. Reactive programming enables developers to take a declarative approach to handling asynchronous events by providing a stream of data that can be processed and transformed using functional programming techniques.
At This Dot Labs, RxJS has remained a critical component of our team’s diverse technical expertise. Not only does our team’s past projects reflect a rich understanding of the library’s evolving intricacies, but our leadership team and network of on-demand developer experts includes current RxJS Core Team members Tracy Lee and Ben Lesh.
Our team is also an undisputed leader in RxJS media, hosting regular live events and creating other multimedia content with which we help developers remain current with library updates, and new trends in industry best-practices.
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In this State of RxJS event, our panelists discussed the current state of RxJS and the upcoming features and improvements of the highly anticipated RxJS 8 release. In this wrap-up, we will talk about panel discussions with RxJS core team members, which is an in-depth exploration of the upcoming RxJS 8 release, highlighting its key features and performance enhancements. You can watch the full State of RxJS event on the This Dot Media YouTube Channel. Here is a complete list of the host and panelists that participated in this online event. Hosts: - Tracy Lee, CEO, This Dot Labs, @ladyleet - Ben Lesh, RxJs Core Team Lead, @BenLesh Panelists: - Mladen Jakovljević, Frontend Web Developer, RxJS Core Team member, @jakovljeviMla - Moshe Kolodny, Senior Full Stack Engineer at Netflix, Previous RxJS Lead at Google, @mkldny - Marko Stanimirović, NgRx Core Team Member | GDE in Angular, @MarkoStDev State of RxJS Ben kicks off the discussion by updating everyone on the current state of RxJS. He starts off by recommending those using RxJS v6 to update to the current version 7.4 because it is about half the size of v6, and he says that v8 will reduce the size even further. There are also performance updates with 7.4 where the speeds improved 30 fold. RxJS version 8 is currently in alpha! There are not as many breaking changes with this version. The major breaking change in this version is that they are removing the long deprecated APIs. They are really wanting people to try things in the alpha version, especially the 408 loops to subscribe to observables. It is an interesting way to consume observables that use the platform, and may work really well with other people’s async await usage. Operators The team is currently trying to figure out a way to show people how they develop operators by giving them the means of developing operators. They currently have a problem where they externally tell people to develop an operator with this, you subscribe, and then you give this kind of hand rolled Observer there. Internally, they have a createOperatorSubscriber which replaces the operate function. They want a reference where you can see how to develop an operator using the ones already there to build your own. There is also a plan to make sure that the RxJS library works as a utility library to work with any Observable that matches the contract. Docs Mladen gives an update of the docs for RxJS. He explains that there aren’t a lot of updates currently with the docs. He explains that there were some issues in the past with exporting operators from two places. There was also an issue with the Docs app build running in the pipeline. He explains that these issues should now be resolved, and that there hopefully won’t be any more issues there. Pull requests are always welcome when working with RxJS docs. They try to stay on top of merge requests as well. NgRx Marko talks about NgRx and RxJS. He explains that RxJS is the main engine of NgRx for almost all of the libraries, especially State Management. A few packages, like direct store, implements a Redux pattern, but uses RxJS under the hood. Pipe Moshe brings up the typings for pipe. All of RxJS’s pipe methods and functions, including the new RxJS function, will work with any unary function. General Questions One of the first questions brought up was if RxJS should not be associated with Angular anymore. Ben brings up the fact that recently, there have been a lot of React people downloading RxJS. Another question was why NgRx is switching to Signals. Marco talks about how NgRx is a group of libraries that is used in Angular. NgRx needs to be in accordance with Angular. One main reason is because of the performance improvements with the change detection strategy. There were also other questions about contributing to RxJS and coming up with a way to utilize the docs for that. There are also questions about the RxJS community, and that there currently isn’t a discord or anything like that for it right now. Conclusion The panelists were very engaged, and there was a lot of dialogue about RxJS and the future that is to come with it. The question and answer portion at the end covered some great material that all the panelists took part in answering. You can watch the full State of RxJS event on the This Dot Media Youtube Channel....
May 22, 2023
4 mins
When we are working on PWAs, sometimes we need to implement features that require us to store data on our user's machine. One way to do that is to use IndexedDb. Our team at This Dot has developed @this-dot/rxidb to create an RxJS wrapper around it....
Oct 13, 2022
6 mins
Are you ready? The latest updates to RxJS 7.5 boast some exciting new features. Major highlights include changes to the the RxJS roadmap. Now RxJS will be broken down to smaller packages #6786 in order to give the team the ability to publish smaller independent RxJS packages. Through this change, for example, developers will import libraries like observables as @rxjs/observables instead of rxjs/observables. This will give library authors and developers the opportunity to only import the package required for their projects. It will encourage more community contributions to separate packages, and also reduce the build size for RxJS. Other updates for RxJS 7.5 Patch Release RxJS 7.5 is the latest release, which added a number of new features that have also improved performance metrics. New features in RxJS 7.5 retry and repeat APIs allow developers to add a delay configuration to these operators (#6640 and #6421), which simplify similar operators retryWhen and repeatWhen. With these improvements, retryWhen and repeatWhen will be deprecated and removed in coming major versions #6859. The share operator was extended to allow developers to pass an observable factory to control the reset behavior, and enable reset delays, #6169. Documentation improvements RxJS 8 has now seen an alpha release, which you can check out by reviewing the official roadmap. RxJS is moving to use NX monorepo for the doc site, and RxJS main builds #6786. Other proposals include Standalone packages like the Observables package. The Standalone Observable package will unify observables usage with the existing patterns in other libraries. This will promote adoption for the proposed native observable with TC39, for which the RxJS team has been advocating. Chrome Dev Tools The Chrome Dev Tools team is discussing whether to add debugging tooling that can help developers debug features in RxJS. Curious about more updates to RxJS? Make sure to check out the Github repo and follow the changelog for more information....
Jul 1, 2022
2 mins
In the latest State of Angular Ecosystem, core contributors of major Angular ecosystem projects shared their thoughts on the new APIs released with Angular 14, and how the community is integrating or updating other libraries like NgRx, Nx, Ionic, and RxJS for the release. Panelists also talked about community initiatives and trainings in Angular, including NG Girls and This Is Angular. Here is a complete list of the hosts and panelists that participated in the online event. Hosts: - Tracy Lee, CEO, This Dot Labs, @ladyleet - Nacho Vazquez, Senior Software Engineer, This Dot Labs, @nacho_devc Panelists: - Ben Lesh, RxJs Core Team Lead, @BenLesh - Mike Ryan, Principal Architect, LiveLoveApp & Co-creator, NgRx, @MikeRyanDev - Liam DeBeasi, Lead Developer, Ionic Framework, [@LiamDeBeasi] (https://twitter.com/LiamDeBeasi) - Juri Strumpflohner, Director of Developer Experience at Nrwl, @juristr - Jordan Powell, DX Engineer at Cypress.io, @JordanPowell88 - Shmuela Jacobs, Web Development Consultant, Founder at ngGirls, @ShmuelaJ - Erik Slack, SE Technical Lead at Cisco, Co-Producer of NgXP.show, @erik_slack - Lars Gyrup Brink Nielsen, Co-Founder of This is Learning, @LayZeeDK You can watch the full State of Angular Ecosystem event on This Dot Media's YouTube Channel. Libraries And Tools NgRx with Angular 14 NgRx 14 is in its beta version, and contributors are working on integrations and features, including adopting Angular 14, to highlight both the store package and the NgRx Components Package. The NgRx Store package update will include a number of features and benefits: The team is working to make it easier to implement an NgRx Store, requiring less code. A new createActionGroup() function to simplify and reduce the amount of code it takes to create a group of actions for an NgRx Store. NgRx ESLint Plugin will be added to your project automatically when you install an NgRx store to help improve code implementation best practices. NgRx Component Package NgRx Component is a project that looks toward the future of Angular by improving the process of developing Reactive components using Observable. NgRx Component is completely separate from NgRx store, and it features new improvements, including: - Type checking templates - More control for error handling - Improved performance when you don’t have Zone.js Make sure to check out NgRx 14.0 beta ng add @ngrx/store@next. Nx with Angular 14 Nx version 14 was released three weeks ago, with a minor release (14.2) soon following. With these products, the team focused on reducing configuration for Nx to make it simple to just install Nx in a project, and start working with it immediately. Other updates include: Nx.json file is optional with this release It comes with Angular 14 out of the box It includes ng update for automatic migration to the latest Angular version It includes TypeScript 4.7 support Storybook 6.5 support and upgraded Prettier Preparation for integrating the just released Cypress 10 is on the way Nrwl Nrwl has now officially taken over the stewardship of Lerna.js. Nx was always able to integrate with Lerna directly to publish features, bootstrap, and use Nx for task scheduling. It was only made official recently when the main readme was updated, but Nrwl has already maintained Lerna for a couple of years. The purpose of this is to help the Lerna community continue to evolve. The team already made some updates, released version 5 with security patch support, and deprecated some old packages. Additionally, they removed support for old Node versions, and improved the developer experience. Nrwl has a roadmap for upcoming Lerna features that you can check out. For version 5.1, the team added a very easy opt-in feature for Nx which allows developers to install Nx and start using it without the need for configurations. However, this version allows developers to still have the Lerna commands with Nx as an additional package. Ionic Angular At the most recent Ionic Conf, we learned that Ionic and Angular power about 10% of Apps on the Apple App store, and 20% on the Google Play Store. Ionic 6.1 was released with a number of improvements to UI Components. Ionic is working on a Component Playground feature to be released under the Ionic docs website soon. This feature will help developers interact with the UI, see exactly what it will look like, and switch between iOS mode, Material Design mode, or Dark and Light Design modes. With Capacitor, the Ionic team announced the Native Google Map plugin, a highly requested plugin from the community. Ionic’s next release will come with Angular 14 support. Angular Girls (Ng Girls) Ng Girls is an organization that trains women on the fundamentals of Angular. As physical events return, the team is working on workflows and processes to make it easy to join or host mentoring sessions for Ng Girls. Ng Girls founder Shmuela Jacobs recently released a course that helps developers learn How to Build applications with Angular. You can check out her course to learn more. This Is Angular This Is Learning is the non-profit organization behind the “This is Angular” course. All of the courses on This is Learning are free for anyone, and are also available for anyone to contribute to. Check out the website This Is Learning to learn more! Changes to Angular for Library Authors It is highly recommended that library authors who are not using IVY compilation yet migrate to the latest version before Angular compatibility support is officially removed. This removal could render such libraries unusable with new versions of Angular. The new Standalone APIs give library authors the opportunity to provide independent configuration functions that can be used without the need for Ng Modules. The independent inject function constructors and property initializers allow library authors to try out new patterns that are best suited for libraries and Angular applications. Starter.dev This Dot Labs recently released Starter.dev in beta, which offers starter kits in a variety of languages that allow developers to figure out architecture configurations. Starter.dev has a starter kit for Angular and it is available to test. Check out https://starter.dev to learn more. Other Announcements Our event concluded with the announcement of a new book called The Angular Developer's Nx Handbook by Lars Gyrup Brink Nielsen. Want to learn more about Angular? Check out the official Angular blog and head over to the This Dot blog for more Angular content!...
Jun 27, 2022
5 mins
This Dot Media is kicking off a brand new series of videos in 2022 to help developers learn how they can contribute code to some of the world’s most popular JavaScript frameworks and technologies. Subscribe to This Dot Media’s Youtube Channel. To continue our series, highlighting best practices for developers interested in contributing to their favorite technologies, I met up with my good friend and creator of RxJS, Ben Lesh. If you would like to check out that interview, you can see it here. What is RxJS? RxJS is a library for reactive programming that uses Observables to make it easier to compose asynchronous or callback-based code. It is a rewrite of Reactive-Extensions/RxJS with better performance, better modularity, better debuggable call stacks, all while staying mostly backwards compatible, with some breaking changes that reduce the API surface. Ben Lesh Ben Lesh is an international speaker and RxJS Core Team Member. His involvement with the framework started a few years ago, when he was asked to work on a rewrite due to his open-source experience in other projects at Netflix. What to Know Before You Get Started According to Ben, the codeofconduct.md and contributing.md documents are the best places for new developers to start. It is crucial that new contributors abide by community standards and the correct commit format, so be sure to read through! *Quick Tips!* -Everything in RxJS is written under src/internal, where you can look at all the internals of RxJS. -The commit message generates the changelog, which can be found on changelog.md. The Best Way to Get Started When I asked Ben what areas of the repository were best for new contributors, and what areas needed the most attention, he of course said: documentation. But it’s true! According to Ben, devs can simply click the “Improve Documentation” button, and do a direct commit. Presently, the team could significantly benefit from contributors interested in checking links to ensure that they are not broken, revising grammatical errors, ensuring all information is up to date, and adding edit buttons in the documentation for individual pages. However, if developers are looking for a different challenge, they can see open requests for contribution by checking out the “help wanted” tag in the issues section. *Quick Tips!* -Don’t simply submit a bunch of PRs to get on the contributors list! Focus on contributing helpful, meaningful work that will advance RxJS! -Because issues are not checked every day, you want to make sure that there is not already a PR for it, and that it hasn’t already been assigned to someone. Also, make sure to look through the PRs to ensure that the issue is not being addressed in both open and closed PRs. What About Attending Core Team Meetings? Core Team meetings typically address in-depth issues and questions related to RxJS, and are not open to the public. However, contributors can receive invitations based on their PRs and need, so if developers are interested in attending Core Team meetings, the best thing to do is create a presence in the RxJS Community! Though meetings aren’t open or recorded, community members can view the issues, and see the tag “agenda item” to see what topics will be addressed at upcoming meetings. Usually, the discussions are commented on in the issues. *Quick Tips!* -If you are interested in getting involved, but don’t want to contribute code, go out into the world and review external articles or Stack Overflow, and help in the community! -Blog posts and explanations about RxJS are also valued by the community and Core Team! Ready to Begin? You can find the RxJS repository here!...
Feb 10, 2022
3 mins
What is an AsyncValidator, and how we can use them to improve our forms....
Dec 14, 2021
4 mins
