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RxJS with Ben Lesh

50 min episode · 2 min read
·
Ben Lesh

Episode

50 min

Read time

2 min

Topics

Career Growth, Remote Work, Leadership

AI-Generated Summary

Key Takeaways

  • Career advancement strategy: Answer Stack Overflow questions you don't know by researching solutions first, then posting answers. This conspicuous helpfulness led to Ben's Netflix recruitment after appearing repeatedly in Angular search results, demonstrating visibility drives opportunities.
  • Observable use cases: Implement observables for scenarios requiring zero to multiple values, cancellation capability, or event coordination across streams. Skip them for single synchronous operations or simple HTTP requests where promise overhead matters less than development complexity and bundle size.
  • Memory management advantage: Observables provide deterministic teardown that automatically cleans up subscriptions, WebSockets, and in-flight requests when unsubscribed. This prevents memory leaks in complex real-time dashboards where manual event coordination becomes difficult to manage across retry logic and nested subscriptions.
  • Platform standardization timeline: Native observables land in Chromium one thirty three with when method on event targets, providing multicast behavior by default. RxJS eight will wrap platform observables with polyfill support, while version seven continues maintenance for existing codebases without migration pressure.

What It Covers

Ben Lesh discusses RxJS evolution, from its Microsoft origins to becoming a web platform standard through W3C. He covers observable patterns, async programming challenges, and the upcoming RxJS version eight targeting native browser observables.

Key Questions Answered

  • Career advancement strategy: Answer Stack Overflow questions you don't know by researching solutions first, then posting answers. This conspicuous helpfulness led to Ben's Netflix recruitment after appearing repeatedly in Angular search results, demonstrating visibility drives opportunities.
  • Observable use cases: Implement observables for scenarios requiring zero to multiple values, cancellation capability, or event coordination across streams. Skip them for single synchronous operations or simple HTTP requests where promise overhead matters less than development complexity and bundle size.
  • Memory management advantage: Observables provide deterministic teardown that automatically cleans up subscriptions, WebSockets, and in-flight requests when unsubscribed. This prevents memory leaks in complex real-time dashboards where manual event coordination becomes difficult to manage across retry logic and nested subscriptions.
  • Platform standardization timeline: Native observables land in Chromium one thirty three with when method on event targets, providing multicast behavior by default. RxJS eight will wrap platform observables with polyfill support, while version seven continues maintenance for existing codebases without migration pressure.

Notable Moment

Ben reveals he initially told Netflix, Jafar Hussain, and Eric Meyer he was unqualified to rewrite RxJS and provided a list of better candidates. They insisted based on his open source experience, leading to eleven years stewarding a library downloaded over two billion times.

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Episode Transcript

RxJS is an open source library for composing asynchronous and event based programs. It provides powerful operators for transforming, filtering, combining, and managing streams of data from user input and web requests to real time updates. Ben Lesh is the creator of RxJS. He joins Josh Goldberg to talk about his path into engineering and the RxJS library. This episode is hosted by Josh Goldberg, an independent full time open source developer. Josh works on projects in the TypeScript ecosystem, most notably TypeScript eslint, the tooling that enables eslint and Prettier to run on TypeScript code. Josh is also the author of The O'Reilly Learning TypeScript Book, a Microsoft MVP for developer technologies, and a live code streamer on Twitch. Find Josh on Blue Sky, Mastodon, Twitter, Twitch, YouTube, and .com as Joshua k Goldberg. Ben Lesh, welcome to Software Engineering Daily. Hey. Thanks for having me. I haven't seen you in a while. Yeah. It's been a bit. I'm excited to talk to you. You've been doing a lot of really interesting stuff around observables and RxJS. But before we get into all that, can you tell us how did you get into coding? Well, let's see. I had been doing, like, little basic programming stuff when I was a kid. But then I went to art school, dropped out of art school after about three years and was working doing graphic design work at Ohio State University working there. I was not going to school there. There's a situation where someone was working on a website or whatever, and I was curious about it. And I thought I could fix something or work on it. And, basically, I learned how to to do, like, some basic HTML and JavaScript stuff. And I had a friend that was like, dude, do you know how much more money you can make doing this? And I was like, really? So at the time, there was no Google. There was no Stack Overflow. None of that. I basically loitered in Barnes and Noble and read books because that was the only way to get recent information. Like, they weren't at the library or anything. You know, practice doing stuff on my little compact presario. Eventually, I I got my first programming gig. It was there is an ad. There's trying to hire somebody for it was, like, $80 an hour or something like that for four hours a day. I had to call them over and over and over again because they're not calling me back because I, you know, wasn't qualified for what they were looking for. And they finally brought me in, and they're like they asked me some questions. I got probably half of them right. And they're like, so you know what we're gonna ask is you like I was like, do you think you're qualified for this? And I was like, well, no. But I really think I can do what you need done, and I'm willing …

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  • Career advancement strategy: Answer Stack Overflow questions you don't know by researching solutions first, then posting answers.
  • RxJSBy guest
    Ben Lesh discusses RxJS evolution, from its Microsoft origins to becoming a web platform standard through W3C... RxJS eight will wrap platform observables with polyfill support, while version seven continues maintenance for existing codebases.

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