Today, This Dot Labs is proud to announce the release of a collection of free training video resources for developers.
The first batch of this growing library includes five courses on contemporary web development subjects, all taught by working software engineers.
Topics include:
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Join us July 22nd, 2020 for our next JavaScript Marathon! JavaScript Marathon is a full day of free, online courses on Angular, React, Vue, RxJS, and Web Performance. Come learn about some of the leading web development technologies, and concepts! Stay for one training, or stick around for the whole day! No two sessions will be the same! --- Featuring Shawn Wang @ 11:00am - 12:00pm EDT In this session we will learn how to build a fullstack serverless React + GraphQL app from scratch with authentication, storage, and multiplayer realtime collaboration, all atop infinitely scalable AWS components, with AWS Amplify! It's never been this easy to go from idea to prototype, and each piece will be livecoded in front of your very eyes! --- Featuring Michael Hladky @ 12:30pm - 1:30pm EDT The async pipe is boring! Understand the guts of Angulars change detection and why zone.js is your biggest enemy. Learn the tricks on template bindings, component rendering, and where you pay the biggest price. As a cutting edge demo, you will understand how to analyze blocking UIs over flame charts and how to avoid them. In the end, you will be able to get zone-less performance even in zone-full Angular applications! --- Featuring Nathan Walker @ 2:00pm - 3:00pm EDT During this introduction to Nativescript, you’ll get a brief overview of what Nativescript is and how it works. You’ll also learn how to create a TypeScript, Angular, Vue, and React based app, + so much more! --- Featuring Cecelia Martinez @ 3:30pm - 4:30pm EDT Looking to add testing to your skill set or just feel more confident pushing to production? In this beginner-level talk, we will walk through the process of installing, configuring, and writing a critical-path test using Cypress. Written in JavaScript and built on the popular Mocha and Chai libraries, the free and open-source Cypress Test Runner gets you up to speed with end-to-end testing fast. We will also cover general testing strategies for beginners, including how to decide what to test and how to ensure your test suite is effective. --- Featuring Jesse Tomchak @ 5:00pm - 6:00pm EDT Setting up user authorization and authentication can be a minefield of security practices, token verification, valid callback urls, salt hashes, and more. Now take all those struggles and sprinkle them over serverless functions! When all we want to do is get past the login page to our actual application. We'll walk through setting up secure oAuth with AWS Lambda functions, covering common pitfalls, so that you can get back to the fun part of your project. --- Tune in next month for another full day of JavaScript Marathon! Need private trainings for your company? If you would like to learn more about how you can leverage This Dot’s expertise to upskill your team, and reinvigorate your developers with new knowledge about the web’s leading development technologies, visit the trainings page....
Jul 8, 2020
4 mins
After such amazing feedback from our inaugural JavaScript Marathon in April, we have a very special announcement... Starting this month on June 24th, 2020, This Dot will be hosting monthly JavaScript Marathon trainings! These free, online courses will be on Angular, React, Vue, RxJS, and Web Performance. Come learn about some of the leading web development technologies, and concepts! Stay for one training, or stick around for the whole day! No two sessions will be the same! --- Featuring Kent C. Dodds @ 11:00am - 12:00pm EDT React Suspense is coming and it's going to be awesome. It's currently in alpha and you can play around with it. In this tutorial we'll focus on the fundamentals of how React Suspense works (in its experimental form) and how that can help improve the user experience. --- Featuring Brian Lagunas and Jason Beres @ 12:30pm - 1:30pm EDT Angular schematics drive the productivity features of the Angular CLI. With the added benefits of tools, such as Ignite UI from Infragistics, you can take the CLI to the next step with built in component and app templates, and customized themes, and more to kickstart the app experience you need. In the webinar, Brian Lagunas and Jason Beres from Infragistics product teams will walk you through how to use the CLI and how you can create your own customizations to bring hyper-productivity to your teams. --- Featuring Jake Dohm @ 2:00pm - 3:00pm EDT Come join us as we walk through the new Composition API that will be released as part of Vue 3. The Composition API is a way to abstract functionality in your application, using some new internal APIs that Vue is exposing. Inspired by React Hooks, it makes it much easier to share logic, data, and methods across components in your app. --- Featuring Justin Ribeiro @ 3:30pm - 4:30pm EDT With the latest release of Lighthouse, we have new metrics and tools at our disposal to make our web performance testing and tracing even better than before. In this training, Justin dives into what changed, how this affects your users, and why you should care about these latest advancements. --- Featuring Chris Whited @ 5:00pm - 6:00pm EDT We are going to learn how to create a new API using the NestJS NodeJS framework, and then use this API to connect to a database and build a REST API for creating, updating, and tracking issues. We will learn why NestJs is becoming one of the most popular NodeJs frameworks. --- Tune in next month for another full day of JavaScript Marathon! Need private trainings for your company? If you would like to learn more about how you can leverage This Dot’s expertise to upskill your team, and reinvigorate your developers with new knowledge about the web’s leading development technologies, visit the trainings page....
Jun 8, 2020
4 mins
It’s official. RxJS 7.0 has been deemed stable and is now available in its beta form. The core team, committed to maintaining a dependable and adaptable reactive programming tool, has built this new release to improve many aspects of developer experience without triggering changing breaks to existing code. Through a partnership with Google, the RxJS core team was able to test its latest release by integrating the library into the Google 3 monorepository. In doing so, they ran RxJs against thousands of build targets, and across countless applications, to identify where code breaks were happening, and what could be done to ensure stronger stability. Updated Typing RxJS 7.0 is written in Typescript 3.8, which allows users to leverage all of Typescript’s latest features. For example, RxJS’ typing inference capacity, especially with respect to how the library handles generics, has significantly improved. Previous versions struggled to type larger rests of arguments, with prior upper bound limits not usually exceeding 8 or 9 values. These limitations, however, have been removed, allowing developers to pass an infinite number of values with one call. The team was also able to fix many antiquated types that did not reflect the runtime behavior of actual APIs. As a result, several Observables, including *'toPromise()'*, have been deprecated in order to mitigate the challenges of legacy behavior without significantly impacting existing code. New Features animationFrames(): an Observable that returns the milliseconds elapsed since the start of the Observable, which is especially useful for coding animation, and replaces previous methods of incrementing numbers. lastValueFrom() and firstValueFrom(): Observables that return the last and first values in a promise, respectfully. They improve upon *‘toPromise()’* by returning an ‘EmptyError’ when passing promises without values, and giving users more flexibility when selecting the values they want returned. AsyncIterable support: Any areas of code that previously accepted a Promise, or an Observable, now also accept AsyncIterables. rxjs-for-await: a separate library which supports async-await for-await loops via AsyncIterables. *'retry({resetOnSuccess: true})'*: In 6.0, if you had a source that errored with, for example, a retry count valued at 5, it would only error a total of 5 times, no matter how many successful messages it had passed. With *'retry({resetOnSuccess: true})'*, the retry count value will reset every time a successful message is passed. TimeStamp: an interface with a *‘now()’* method that returns a number. Name Changes: In order to create fewer collisions between four legacy operators, and creation methods with the same name... *'zip(other$)'* is now *'zipWith(other$)'*. *'combineLatest(a$, b$)'* is now *'combineLatestWith(a$, b$)'*. *'merge(partner$)'* is now 'mergeWith(partner$)'. *'concat(ender$)'* is now *'concatWith(ender$)'*. Deprecations In 7.0, no critical elements have been removed from the library, but several features have been deprecated. These include: ResultSelectors, which have been deprecated since 5.0. The process of passing scheduler arguments through functions such as ‘of()’ or ‘range()’ has been deprecated, and should be replaced by using ‘scheduled()’ or ‘observeOn()’. This has been done in order to remove scheduling logic from operators that don’t need it. Some subscription signatures will be deprecated. With this newest release, subscriptions should only be called with a single function, or a partial or complete Observable. The same will also go for tap signatures. This will simplify the development process and help eventually make the library more lean with future releases. Functions that pull in schedulers are now deprecated as of this release in order to prepare users for the eventual phase-out of passing schedulers to certain functions. Looking Forward to 7.1 and Beyond In order to support future changes to the library, the RxJS team will begin introducing ESLint transformations. These updates will help developers remove deprecated code, such as APIs, from their applications, and prepare users for future, major releases as the library becomes faster and leaner. However, Ben Lesh, RxJS core team lead, ensures that no breaking changes will be scheduled until version 9.0 at the earliest. How You Can Contribute The RxJS core team welcomes enthusiastic RxJS experts to help contribute to refining version 7’s future updates. Those experienced with ESLint transformations, or who want to update documentation are welcome to contribute to this open-source library. And of course, the RxJS team relies on the amazing work of authors, bloggers, content creators, and those working in developer relations, to share insights into the library with the development community. If you’re just getting started with RxJS, check out this fantastic “1 Hour to Learn RxJS” tutorial by Ben Lesh from This Dot Labs' Javascript Marathon, where you can learn about Observables and operators, including how to build an Observable from scratch!...
Jul 31, 2020
4 mins
Introduction Following our recent blog post on migrating E2E tests from Cypress to Playwright, we've identified opportunities to enhance our test scripts further. In this guide, we'll delve into the basics of Playwright fixtures, demonstrating their utility and flexibility in test environments. Playwright fixtures are reusable components that set up and tear down the environment or conditions necessary for tests. They are crucial for writing clean, maintainable, and scalable tests. Fixtures can handle tasks like opening a browser, initializing a database, or logging into an application—actions you might need before running your tests. As a practical example, we'll revisit one of the tests from our previous post, enhancing it with a new fixture to streamline the testing process and significantly improve maintainability. This post is designed to provide the foundational skills to integrate fixtures into your testing workflows effectively, giving you the confidence to manage and maintain your test scripts more efficiently. Creating Our First Fixture To illustrate the power of fixtures in Playwright, let’s consider a practical example from a test scenario in our project. Below is a snippet of a test case from our newsletter page: ` This test scenario navigates to the newsletter page, fills in an email, submits the form, and checks for a success message. To optimize our test suite, we'll refactor common actions like navigation, form completion, and submission into reusable fixtures. This approach makes our tests cleaner and more maintainable and reduces redundancy across similar test scenarios. Implementing the Fixture Here’s how the fixture looks: ` This fixture encapsulates the actions of navigating to the page, filling out the email field, and submitting the form. By abstracting these actions, we simplify and focus our test cases. Refactoring the Test With the fixture in place, let’s see how it changes our original test file: ` A beforeEach method to reset the state of the NewsletterPage fixture ensures a clean and consistent environment for each test scenario. This practice is crucial for maintaining the integrity and reliability of your tests. By leveraging the NewsletterPage fixture, each test within the "Newsletter page" suite starts with a clean and pre-configured environment. This setup improves test clarity and efficiency and aligns with best practices for scalable test architecture. Conclusion As we've seen, fixtures are powerful tools that help standardize test environments, reduce code redundancy, and ensure that each test operates in a clean state. By abstracting common setup and teardown tasks into fixtures, we can focus our testing efforts on what matters most, verifying the behavior and reliability of the software we're developing. Remember, the key to successful test management is choosing the right tools and using them wisely to create scalable, maintainable, and robust testing frameworks. Playwright fixtures offer a pathway towards achieving these goals, empowering teams to build better software faster and more confidently....
Jul 26, 2024
2 mins
