Mo
@mo__javad
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Head of Mobile (UK) @ Theodo 📱 Organiser @ React Native LDN ⚛
London / Edinburgh
Joined October 2018
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Entering the UK, the Immigration Officer asks me what I do…
Me: Mobile Development
Him: You specialise in Swift or Kotlin?
Me: I mainly focus in RN
Him: What’s the point of RN these days with SwiftUI & Compose?
Me: 🤯
Not the conversation I was expecting at the border 😂
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Turns out he’s trying to launch an app on the side of his full time job!
Power to him 🫡
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I guess this convo was prep for my talk tomorrow
@cityjsconf
…
Looking forward to going over why NOT choosing React Native is the wrong bet in 2024! 🙌⚛️
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After playing about with SwiftUI a bit the last couple weeks, I was curious on how the render times compare to React Native & Flutter.
I did a _very_ basic level test rendering 1000, 2000, and 3000 views with and without text.
Here were the results:
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I've always wondered if not using StyleSheet in React Native would have a negative impact on your app's performance.
I rendered 6000 views using:
1. `StyleSheet.create`
2. A regular object outside the component
3. Inlining styles
🤔 The results were interesting:
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My talk on why Airbnb was wrong to ditch React Native has been published on Youtube! 🎉 This was one of my favourite talks that I've done so far 🙌
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I've redone the experiments for React Native to use a more accurate measurement of the full render + paint on the UI thread.
On average, there's ~30% drop in the measured render times, which gets it much closer to native performance.
(Light red are the previous measurements)
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@AngryJoeShow
Been watching you since I was 12. Always enjoyed your gaming content, and even though I don’t game as much anymore, I still really enjoy your vids.
Can’t wait for a political AJ vid! 😁
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FlatList slows down React Native apps. 🐌
This is nothing new, but when targeting lower-spec devices, such as TVs, you've got to be super careful.
Our team built a specific carousel/list component for TVs, and it lowers CPU usage by around 25% compared to FlatList 🤯🏎️
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Super excited to announce the launch of the React Native TV Blog! 🎉📺 Using RN on the big screen has long been underserved - there wasn't a single, unified resource where devs can go to learn about how to build TV apps with RN. We've been working on TV apps for years!
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I've been toying with the idea of creating microfrontends in mobile apps.
I wanted to try to have two separate bundles in a single app that could have OTAs trigger updates separately from one another.
I was able to get a (very very) rough POC showing this working:
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We setup a nightly performance testing pipeline for our React Native app! 🌙
The whole setup process takes less than 30 mins and can help you stay on top of your app's performance as you build it out! 💪
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Firebase Dynamic Links are being shut down - which raises a question on the best way to handle deep linking going forward in apps across web & mobile.
It's a good time for RN apps using FBDL to consider the benefits of going universal with
@expo
Router
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React Native Web is a massive bloat to universal apps on the web... 🫣
Look at the starter Expo Router project - RNW is 317KB, which makes a substantial difference to web performance. A lot of this is stuff you may not want to use on web - 77KB out of the 317KB is the Animated
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I recently did a talk about building whitelabel mobile apps at DevDaysEurope. We took this approach on a project last year that needed multiple apps for dozens of brands built from the same base. 🏷️📱
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A genuine interaction at iOS Dev UK with someone (let’s call him Mr X)
Me: “I do a lot of React Native day-to-day”
Mr X: “isn’t RN dead already?”
Me: “who told you that?”
Mr X: “our Flutter team”
🤦♂️🫠
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Went into another styling tunnel and implemented spending chart from the
@monzo
app in RN. 💰
Built with core React Native Animations - I'll be publishing a tutorial + source code tomorrow 🙌
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After suggestions from
@natebirdman
and others, I looked at React Native render times using Native Views & Text elements without the JS wrappers, trying both the old & new arch.
We're seeing on average 15% better render times. 🏎️
Here are the results on iOS:
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One of the most underrated changes in
@expo
SDK 50 is the smaller bundle size in Expo router apps for web.
Compressed gzip sizes are down by around ~100kB 🎉
This means that we have around a 30% decrease in the starter template size! 🙌
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Server Driven UI is a great way tackle the problem of having too many layout variants within an app.
It takes away the complexity from the FE by ingesting layouts from an API, so changes don't need updating the FE code.
I'll be talking about SDUI
@reactconn
&
@ReactSummit
! 🙌
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Couple hours into being in India for the first time.
I’ve asked 3 different places if they have wifi, only to be offered people’s personal hotspots instead.
Why are people here so nice?? 😍
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🌅 Sunrising React Native.
We have an exciting announcement coming soon for the React Native London community!
Stay Tuned.
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I've written more about these tests here:
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Today, we’re sharing our CI/CD pipeline that allows us to create preview deployments for React Native apps using
@expo
🙌
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Some last minute talk preparation on a rooftop in Berlin…
See y’all tomorrow 👋
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We had some trouble a couple months back handling password reset with
@supabase
on our RN app.
Didn't find any resources and it involved a load of trial and error to get working.
I finally sat down and did a write-up of how to get it working! ✍️
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The big surprise was when you looked at the standard deviation.
I ran the experiments 10 times for each test on each platform.
SwiftUI and RN had generally low levels of deviation across the tests.
Flutter, not so much... Results were massively inconsistent 😬
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I’ll be giving this talk tonight
@RNLmeetup
.
Lots to cover in a short time - really excited but also a bit nervous getting into this 😅
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Setting up a design tokens CI pipeline is seriously underrated.
Within a minute, I was able to change a colour on Figma, trigger a sync, and update the styles in my app and website simultaneously.
Imagine the amount of time saved needing to restyle large apps across platforms
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Do Animated Collapsible Headers Slow Down React Native Apps? 🤔
I've been curious if animating the header to collapse when the user scrolls down a ScrollView would affect performance.
Ran a basic test and it gets near identical scores to a native header! ✅🎉
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I can’t stress how much I think React Forget is going to change the game with RN.
#ReactAdvanced
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Let’s go Round 2 of this talk! 🚀😅
☀️ Sunrising React Native: Why Airbnb was wrong to ditch RN in 2018…
@cityjsconf
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It was absolutely lovely hosting
@Kelset
,
@CipolleschiR
, and
@alxhnt
last night at RNL! ⚛️
We talked about how RN is used in big tech, and how it can differ from the ways that the community uses it!
Really glad we got the opportunity to have this panel at
@RNLmeetup
! ❤️
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Bonded with
@ythecombinator
over the shared experience of getting stopped at airport security every time
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My talk
@ReactNexus
just got published on YT:
Really enjoyed talking about universal apps, how to share state/logic in a monorepo structures, and moving state to the edge. Probably one of the most enjoyable talks I've given yet. 🙌
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Was building a POC with maps and a carousel, and suddenly accidentally opened it up in the VisionOS simulator...
To my surprise, it worked flawlessly on
@expo
Go! 🤯
This feels like opening Pandora's box...
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I absolutely love this talk by
@DelphineBugner
from our
@bam_lab
team.
Check it out on the
@appjsconf
live stream if you haven’t seen it yet
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Sitting at the airport on the way home, I'm reflecting on what an incredible week it's been
@ReactNexus
! I've had the chance to meet some incredible people, and learn so much!
The enthusiasm that the BLR community has for React is so precious and I can't wait to be back!
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I did a demo yesterday using an
@expo
snack, and ended up showing a QR code for people to scan and try it out on their phones.
We had over 50 people download the Expo Go app and connect live. It was a really cool experience! 🙌
A really cool tool for interactive demos!
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👀 Might be a risky move to show this slide at a React Native conference...
See you all at
@thegeekconf
👋😅
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A lot of mentions by the folks at
@AmazonAppDev
(& Maxwell) about some of the work that we’ve done in the RN TV space!
1. React TV Space Navigation, of course 🚀
2. Flashlight, runs on TV and can help optimise TV app perf. 🔦
3. RNTV blog that we started together! 📄
@bam_lab
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My wife just got a job offer for a library role she really wanted! ❤️🎉
And what does she do to celebrate?
Reads a book! 😅
Very on brand
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Not to stir the testing pot again but... 👀
One of the benefits of taking the logic out of our components & screens in our React / RN apps is that it makes testing substantially easier and powerful.
That way we don't bother testing UI elements and focus on just business logic.
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Microsoft is "retiring" App Center. 😔 This is quite sad imo - especially given the fact that CodePush is such a big part of the RN ecosystem and brought over-the-air updates to the masses.
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I usually associate August in Edinburgh with traffic and crowdedness, so it was a pleasant surprise to see someone from the RN community visiting!
Great meeting
@tsapeta
in Scotland 🏴
Hopefully, we’ll meet again in Krakow next time
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Just saved
@kacperkapusciak
from getting ran over by an electric scooter.
Does this count as “contributing” to OSS?
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Finally got the chance to contribute to
@tamagui_js
! 🎉
We now have the `onLongPress` for any of the `Stack` based components! 🙌
thank you
@natebirdman
for such a quick turnaround with reviewing!
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Just got off the plane in Paris and as I was walking down the steps, my eye caught this absolute marvel of engineering beauty… 😍🥹
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Thanks for the shout
@anisha_malde
&
@chris_trag
! The team at
@bam_lab
worked really hard on `react-tv-space-navigation` and we're excited to see more RN running on the big screen. 📺
(P.S. If there's enough market demand for Hoppix, then maybe we might make it a reality 🐰😅)
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I've been playing around with
@AnthropicAI
's Claude for a couple hours, and I've got to say, I'm impressed. 🤖
I asked it to convert a pretty complex React + Tailwind page from TailwindUI to React Native (using Stylesheets) and it did a pretty decent job! 🤯
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📸 Screenshot + Requirements ➡️ RN Code 🤖
Testing LLMs by passing in an image of a screen + basic requirements to generate React Native code.
Here's how
@GoogleAI
,
@ChatGPTapp
,
@AnthropicAI
did taking a screen from the
@NOW
app.
The difference is staggering 🤯
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After a long wait, my talk at
@RNLmeetup
with
@giolaq
about using RN on TVs is finally on Youtube! 📺
Thanks to the team at
@AmazonAppDev
for editing and publishing. 🙏
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Scrolling through some random Github repos and I landed on this gem from 2 years ago...
@Baconbrix
- This didn't age very well 😂 (and I'm glad it didn't...)
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Just started using
@arcinternet
like 5 mins ago, and wow... this is so refined it's crazy.
Hoping this will stop me from having 32 Google Calendar tabs open at once and getting a heart attack 10 mins before a meeting.
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I’m beyond words… at the end of our meetup tonight, the
@RNLmeetup
crew (+ Francois) surprised me with a cake and a (rather large) group bday song 🎂
You guys are amazing! ❤️ thank you so much
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And that’s a wrap for an eventful conference week! 🎉
Starting off from London, travelling to Helsinki, followed by Amsterdam! 🇬🇧🇫🇮🇳🇱
@samuelpmacleod
@JamesDHW
@ChloeCaronEng
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Caveat: these aren't the most rigorous tests ever and I kinda did them in my spare time out of my own curiosity.
There are far more holistic ways to get a sense of overall performance (like using )
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@emergetools
@peacock
Were there any other metrics used for measuring performance other than bundle size and time to launch?
Curious to see what differences were made on runtime (maybe a difference in FPS or CPU usage)
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Nonetheless, you should still use StyleSheets where possible, and I make a case for it in my blog post below 👇
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Now, this isn't surprising. Apple will be able to optimise SwiftUI incredibly well for iOS and doesn't have to worry about being crossplatform and generic.
Generally, RN achieved better results than Flutter (especially with Text nodes). 😅
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I’ve been spending some time comparing prebuilt Auth solutions to make starting off projects quicker than before 🏃
I look at
@AWSAmplify
,
@Firebase
, and
@ClerkDev
to see who’s offering the best solution for React Native apps.
(Thread 🧵)
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Hey folks! If you’re in Krakow tonight, come along to the RNCK meetup! 👋👋
What do you do, when you have too many great talks proposals for
@appjsconf
? You organize a pre-conference meet-up! 🔥🔥🔥
Yep, you can join us &
@plahteenlahti
,
@GroundControl
&
@mo__javad
in our office or online on May 21!
More info & registration👇
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🙋♂️QA from my talk last night:
I've been hearing of the promise "Write once, run anywhere" since the 90s. It was the promise of Java and Flash, and they both failed at delivering. What makes you think React Native will succeed?
It's honestly a great question! Here's my answer:
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Got asked to review a PR while I was on a TukTuk today… what an experience that was 😂
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@jamonholmgren
A few people from our team in France wrote a (rather provocatively titled) articled about KMP just a few days ago:
Happy to put you in touch with some people from the team to chat with them, if you'd like
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Super excited to have my article analysing RN StyleSheets & their performance impact featured in the React Native Newsletter 🙌
The React Native Newsletter issue 178 has been published! Be sure to catch up on your React Native news!
Featuring exciting posts by:
@jamonholmgren
,
@100_crown
,
@tmikov
,
@flexbox_
,
@expo
,
@DanStepanov
,
@numandev1
,
@andrestaltz
,
@mo__javad
,
@_atlj
,
@powersync_
,
@jmeistrich
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I've done some more experimentation comparing the old & new architecture, as well as the NativeView trick that
@natebirdman
suggested.
I'll share them in another article and post soon 🙏
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🤖 We've been using AI as an enabler at our teams in
@bam_lab
&
@theodo_uk
- it's a great way to automate docs and knowledge discovery.
And that's where React Native Buddy 👥 comes into play! 🚀
A tool that knows the best practices and helps you make the right choices!
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@Andrei_Calazans
Me: pulls out laptop and starts presenting my talk on why Airbnb was wrong to ditch React Native for Native in 2018...
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EDI 🏴 → LHR 🏴 → HEL 🇫🇮 → AMS 🇳🇱 → LHR 🏴 → EDI 🏴
All in one week… conference season in full swing!
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Really excited to speak at React Nexus this year! It’ll be my first ever visit to India and I’m beyond excited! 😍
🎉 We are super excited to announce that
@mo__javad
@nishanbende
@AdityaPahilwani
@iponikar
will be speaking at React Nexus 2023.
More speaker announcements coming soon
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After RNL,
@tazsingh
gave me this laptop sticker, and I’ve gotta say, it gives my laptop so much character.
(Also, got to have a
@guild__host
sticker 😍)
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For the first time ever!! 🤯
We're starting our UK React Native Tour, with our first stop being in Bristol!
Grab your tickets and join us at React Native Bristol on May 9th! 🚀
🚀🚀React Native London is coming to Bristol!!
Speakers will be shortly announced, get your ticket now or risk being on the waiting list 😱
grab your tickets here:
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Did you know: There are currently over a dozen operating systems for Smart TVs? 📺
It takes the need for cross-platform to a whole other level.
I'll be doing a talk at the BBC Tech Meetup later today about RN TV.
Find the link to the meetup page in the replies 👇
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The mental models in SwiftUI seem so similar to React.
I can't say for certain it's direct inspiration, but the general movement towards declarative UIs across the board is great!
(Same with Jetpack Compose)
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I'll be speaking this year
@ReactAdvanced
about how the concept of Microfrontends can apply to mobile development. Excited to be a part of this big conference! Here is my digital badge that you can use to join: .
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Building on top of
@georgealexiou_
's Revolut-inspired React Native component, I added some animations and interactivity to focus on each week's specific spend.
This was loads of fun to implement 😅
Going to spend 1 hour every few days recreating components from popular apps in React Native. Today I made
@RevolutApp
's 'Spent This Month' chart which takes a list of amounts spent each week!
Find the link to the Expo Snack in the thread
#typescript
#reactnative
#react
#revolut
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2 Americans and a vaguely American sounding fella walk into the Netherlands…
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Honestly,
@DelphineBugner
just gave the BEST and most comprehensive deep dive into Yoga! 🤯 a really well put together talk - should definitely be top of the list for all the RN conferences next year 😉
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Long lunch & coffee + pastries in Paris with
@acemarke
is a fine way to spend a Sunday afternoon!
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This is misleading - while bundle size and startup time can be important, they are by no means the primary measurement of an app's performance.
What happens to an app's performance when it goes from react native -> native?
The
@peacock
app just made the switch on iOS & Android and had a significant change in size and startup time
🧵 Performance impact of switching to native
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