JSJ 399: Debugging with Async/Await with Valeri Karpov
JavaScript Jabber10 Okt 2019

JSJ 399: Debugging with Async/Await with Valeri Karpov

Valeri Karpov is a maintainer on Mongoose, has started a few companies, and works for a company called Booster Fuels. Today’s topic debugging with Async/Await. The panel talks about some of the challenges of debugging with Async. AJ, however, has never encountered the same problems, so he shares his debugging method. Valeri differentiates between .catch vs try...catch, and talks about why he prefers .catch. There are two ways to handle all errors in an async function without leading to an unhandled promise rejection. The first is to wrap the entire body of the async function in a try...catch, has some limitations. Calling an async function always returns a promise, so the other approach is calling .catch on the promise to handle any errors that occur in that function body. One of the key differences is if you return a promise within an async function, and that return promise is wrapped in a try...catch, the catch block won’t get called if that promise is rejected, whereas if you call .catch on the promise that the function returns, you’ll actually catch that error. There are rare instances where this can get tricky and unintuitive, such as where you have to call new promise and have resolve and reject, and you can get unexpected behavior.The panel discusses Valeri’s current favorite JS interview question, which is, “Given a stream, implement a function called ‘stream to promise’ that, given a stream, returns a promise that resolves to the concatenation of all the data chunks emitted by the stream, or rejects if the stream emits an error event.” It’s really simple to get this qustion right, and really simple to get it wrong, and the difference can be catastrophic. AJ cautions listeners to never use the data event except in the cases Val was talking about, only use the readable event.The conversation turns to the function of a readable event. Since data always pushes data, when you get a readable event, it’s up to you to call read inside the function handler, and then you get back a chunk of data, call read again and again until the read returns null. When you use readable, you are in control and you avoid piling functions into RAM. In addition, the right function will return true or false to let you know if the buffer is full or not. This is a way to mix imperative style into a stream.The next discussion topics are the differences between imperative style and reactive style and how a waits and promises work in a normal four loop. A wait suspends the execution of a function until the promise is resolved. Does a wait actually stop the loop or is it just transpiling like a promise and it doesn’t stop the loop. AJ wrote a module called Batch Async to be not as greedy as promise.all but not as limited as other options.The JavaScript panelists talk about different async iterators they’ve used, such as Babel. They discuss the merits of Babel, especially since baseline Android phones (which a significant portion of the population of the world uses) run UC Browser that doesn’t support Babel, and so a significant chunk of the population of the world. On the other hand, if you want to target a large audience, you need to use Babel.Since frameworks in general don’t handle async very well, the panel discusses ways to mitigate this. They talk about different frameworks like Vue, React, and Express and how they support async functions. They discuss why there is no way for you to actually cancel an async option in an actual case, how complex canceling is, and what you are really trying to solve for in the cancellation process. Canceling something is a complex problem. Valeri talks about his one case where he had a specific bug that required non-generic engineering to solve, and cancelling actually solved something. When AJ has come across cancellation issues, it’s very specific to that use case. The rest of the panelists talk about their experiences with having to cancel something. Finally, they talk about their experience with async generator functions. A generator is a function that lets you enter into the function later. This makes sense for very large or long running data sets, but when you have a bounded items, don’t complicate your code this way. When an async generator function yields, you explicitly need to call next in order for it to pick up again. If you don’t call ‘next’, it’s essentially cancelled. Remember that object.keys and object.values are your friends. Panelists
  • Christopher Buecheler
  • AJ O’Neal
  • Charles Max Wood
With special guest: Valeri KarpovSponsorsLinks Follow DevChatTV on Facebook and Twitter PicksAJ O’Neal:Christopher Buecheler:Charles Max Wood:Valeri Karpov:Special Guest: Valeri Karpov.

Support this podcast at — https://redcircle.com/javascript-jabber/donations

Privacy & Opt-Out: https://redcircle.com/privacy

Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

Episoder(726)

React and Beyond: The Importance of Learning DOM APIs - JSJ 659

React and Beyond: The Importance of Learning DOM APIs - JSJ 659

In today's episode, Charles, AJ and Steve are joined by guests Corey Brown for a rich discussion on the importance of understanding foundational concepts in software development. They explore the balance between leveraging high-level frameworks like React and the necessity of grasping the underlying technologies to troubleshoot effectively and build robust applications. They emphasize the value of comprehending core language features to write better software and solve problems efficiently. Corey reflects on the passion within the software development community and the hidden costs of over-relying on third-party dependencies like the infamous "left pad" incident.As the conversation unfolds, they debate whether sticking to frameworks or delving into deeper technologies leads to long-term success. They share practical insights on the benefits of reading source code, continuously learning, and the significance of core platform APIs. Additionally, the episode includes light-hearted "picks" from the panelists, including humorous resources and personal anecdotes. Join them as they dissect these critical perspectives and share valuable advice for both novice and seasoned developers alike. Let's get started!PicksAJ - Grug BrainAJ - Creeds of CraftsmanshipAJ - AJQuery v3.0.3Cory - Palm Paradise #206Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

26 Nov 20241h 23min

New Horizons in Web Development with Danny Moerkerke - JSJ 658

New Horizons in Web Development with Danny Moerkerke - JSJ 658

In today's jam-packed episode, Charles, AJ, and Dan, along with special guest Danny Moerkerke, a seasoned freelance JavaScript web developer from Amsterdam.  They dive deep into the fascinating world of web development, focusing on the capabilities and future of Progressive Web Apps (PWAs), comparing them to native apps, and discussing the technical intricacies involved.AJ shares his latest project on passkeys and the challenges of transitioning clients, while Dan gives us a glimpse into his social media habits and movie recommendations. Danny enlightens us with his experiences at IKEA and his passion for web components, PWAs, and crucial APIs like the Wake Lock and Background Sync.They explore the complex interplay between service workers, caching for offline functionality, and the barriers to widespread PWA adoption, particularly on iOS. Plus, they dive into practical applications of these technologies, from gaming to improving podcast accessibility for offline listening.So, tune in as they unravel the technical hurdles, share insightful demos, and debate the future of web and native app development. It's an episode packed with knowledge, practical advice, and a bit of fun along the way!SocialsLinkedIn: Danny MoerkerkeBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

19 Nov 20241h 27min

Structuring Node.js Applications: Event Loop, Metrics, and Efficient Processing Techniques

Structuring Node.js Applications: Event Loop, Metrics, and Efficient Processing Techniques

In this episode, they dive deep into the essential practices and principles for successful Node.js development.  AJ and Dan are joined by special guests Michael Dawson, James Snell, and Matteo Collina. They bring a wealth of expertise and experience to the table, discussing key topics like experimental tech with existing web standards, managing updates with LTS releases, and the fundamental pillars of Node.js, including the critical concept of "not blocking the event loop."They explore the consequences of blocking the event loop, real-world insights into performance issues, and the importance of efficient task handling. They also share their wisdom on utilizing multi-threading, scaling applications, best practices for dependency management, and the significance of regular updates to maintain security and performance.Additionally, they touch on some fascinating side discussions, such as AI's role in coding, the evolution of package management, and the importance of intentional coding practices. There's even a bit of personal insight with recommendations for exciting Netflix series and real-world anecdotes about Node.js conferences and testing frameworks.Join them as they unravel these topics and more, guiding you through advanced Node.js SocialsLinkedIn: James SnellLinkedIn: Michael DawsonLinkedIn: Matteo CollinaLinksThe Nine Node Pillars: 9  Principles for Doing Node.js Right in Enterprise EnvironmentsThe Nine Node Pillars | 9 principles for doing Node.js right in enterprise environments - YouTubePicksDan - Monsters: The Lyle and Erik Menendez StoryDan - The WordPress drama explainedMichael - bee-agent-frameworkJames - NodeConf EUBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

12 Nov 20241h 44min

Stimulus and Turbo in Web Development - JSJ 656

Stimulus and Turbo in Web Development - JSJ 656

Dive into the dynamic world of JavaScript frameworks with this week's episode of JavaScript Jabber! Join Charles, AJ, Dan and Steve as they explore Hotwire, Stimulus, and Turbo—tools that are transforming how developers build fast, responsive web applications. They discover the evolution from Turbo Links to Turbo Drive, learn how these technologies enhance page rendering speeds by updating only changed elements, and understand their seamless integration in Rails applications. The discussion also touches on practical implementations using Turbo frames and streams for efficient DOM manipulation. Additionally, they dive into the benefits of partial page updates for improved performance and talk about the insights into integrating Stimulus for fine-grained control over client-side interactions. They also explore the parallels between modern frameworks like React or Angular with traditional approaches.Tune in to uncover how you can leverage these tools to optimize your development workflow!SocialsLinkedIn: Charles WoodPicksAJ - The Fall Guy 4k + Extended CutAJ - Passkeys DemoBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

5 Nov 20241h 26min

Understanding, Confidence, and Humility in Web development - JSJ 655

Understanding, Confidence, and Humility in Web development - JSJ 655

29 Okt 20241h 19min

Exploring Local-First Applications and Data Synchronization Challenges: Part 1 - JSJ 654

Exploring Local-First Applications and Data Synchronization Challenges: Part 1 - JSJ 654

22 Okt 20241h 35min

Slaughtering Sacred Cows: Reconsidering Software Dev Truisms - JSJ 653

Slaughtering Sacred Cows: Reconsidering Software Dev Truisms - JSJ 653

Charles and Dan dive deep into the world of programming languages, development practices, and the trade-offs that shape our daily coding lives. Joining them is special guest Tomer Gabel, an experienced backend engineer, and consultant.In this episode, they unpack the productivity benefits and challenges of using Rails, deliberate on the pros and cons of dynamic languages, and explore the fascinating topic of convergent evolution in programming ecosystems. They also discuss TypeScript's value proposition, the intricacies of static typing, and the sometimes controversial principles of "clean code." Get ready for an engaging conversation packed with expert insights, practical advice, and a few surprising takeaways. Let’s get started!SponsorBlue HostSocialsLinkedIn: Tomer GabelBecome a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

15 Okt 20241h 45min

Unlocking Vue and Nuxt Potential: New Tools, Best Practices, and more - JSJ 652

Unlocking Vue and Nuxt Potential: New Tools, Best Practices, and more - JSJ 652

In this episode, AJ and Steve dive deep into the world of Vue.js and API integration with a special guest, Daniel Kelly, a seasoned lead instructor at Vue School. this episode is packed with valuable discussions on using the useFetch Vue component for seamless API requests, navigating the challenges of migrating from Vue 2 to Vue 3, and embracing TypeScript for a more robust development experience.They also explore the impactful updates coming with Nuxt 4 and Vue 3.5, the benefits of Vue.js certifications for career growth, and how tools like Nitro and auto-import features in Nuxt 3 can enhance your development workflow. Plus, enjoy a range of recommendations from books and music to tech innovations and humorous dad jokes.So, whether you're a seasoned Vue developer or just starting, this episode offers something for everyone. Tune in, and  elevate your JavaScript journey!SocialsLinkedin: Daniel KellyPicksDaniel - Fairy TaleDaniel - Believe by Yellowcard Become a supporter of this podcast: https://www.spreaker.com/podcast/javascript-jabber--6102064/support.

8 Okt 202458min

Populært innen Business og økonomi

stopp-verden
dine-penger-pengeradet
e24-podden
rss-penger-polser-og-politikk
rss-borsmorgen-okonominyhetene
finansredaksjonen
utbytte
livet-pa-veien-med-jan-erik-larssen
tid-er-penger-en-podcast-med-peter-warren
pengepodden-2
pengesnakk
rss-sunn-okonomi
stormkast-med-valebrokk-stordalen
morgenkaffen-med-finansavisen
aksjepodden
lederpodden
rss-markedspuls-2
rss-helt-ra
okonomiamatorene
shifter