Throttling and memoizing App Store scraper calls
How to handle rate limits and memoization when scraping the app-store-scraper package.
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Perttu Lähteenlahti
Experienced React Native developer with a strong background in mobile app development and user experience design. Specializing in creating performant cross-platform applications with modern JavaScript and TypeScript. Currently working as a Developer Advocate at RevenueCat, helping developers monetize their apps.
React NativeTypeScriptIn-App PurchasesMobile Development
Not available for hire
Articles by Perttu Lähteenlahti
How to make money with your Android app
Building a great Android app takes time, creativity, and persistence. But once your app is live, there's one question every developer eventually faces: how do I actually make money from this?
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Perttu Lähteenlahti
Help test Netli.fyi, a Netlify client for iOS (and soon Android)
Netli.fyi is a native iOS client for Netlify that gives you quick access to your sites, build logs, domains, and account info. It's now in beta and needs real-world testing.
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Perttu Lähteenlahti
Best practices for React Query with FlatList
A look at how to combine React Query with FlatList, FlashList, and LegendList for smooth, stable list UIs. Best practices for handling loading states, skeletons, and safe areas.
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Perttu Lähteenlahti
App.js 2025 recap
A personal recap of App.js 2025: speaking about in-app purchases, highlights from Krakow, favorite talks, and why this conference remains one of my top picks.
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Perttu Lähteenlahti
How to use environment variables in Netlify functions
Learn how to correctly manage and access environment variables in Netlify Functions.
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Perttu Lähteenlahti
Making money with your React Native app
Comprehensive look at in-app purchases and how to add them to your React Native app. Covers different types of in-app purchases, how to set them up in your app, and the psychology of good in-app purchase experiences. Technology used: React Native, RevenueCat, App Store Connect.
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Perttu Lähteenlahti
React Native WebRTC
Full article version of the talk I gave at RTC.ON Conference 2024 about getting started with WebRTC in React Native
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Perttu Lähteenlahti
A small helper function for conditional requests in Apollo GraphQL
Struggling with null userID in Apollo GraphQL hooks? The variablesOrSkip function is my fix, smartly skipping or including variables to cut runtime errors and boost code stability in TypeScript projects.
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Perttu Lähteenlahti
How to style contents in dangerouslySetInnerHTML with Tailwind
How to style HTML content in React with Tailwind CSS when using dangerouslySetInnerHTML by writing custom selector using arbitrary variants.
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Perttu Lähteenlahti
Adding custom options to React Native developer menu
Customize the React Native Developer menu to your needs using the built in addMenuItem function.
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Perttu Lähteenlahti
Using styled-components with TypeScript
Improving the developer experience with a few small tweaks
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Perttu Lähteenlahti
Fix 'VirtualizedLists should never be nested inside plain ScrollViews' in React Native
How to fix the 'VirtualizedLists should never be nested inside plain ScrollViews with the same orientation' warning in React Native using ListHeaderComponent and ListFooterComponent.
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Perttu Lähteenlahti
Build a clock face with SVG in React Native
Let´s draw a nice looking analogue clock in React Native with SVG
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Perttu Lähteenlahti
Successful rapid prototyping with React Native
This article is based on a lighting talk I gave at React Day Berlin in 2019. Learnings are from prototyping Nyxo app.
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Perttu Lähteenlahti
Running React Native apps on specific iOS simulators
There is no need to start Xcode to test on different React Native apps on different device simulators. You can do that easily with the simulator flag.
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Perttu Lähteenlahti
App Store release checklist
Checklist for publishing React Native app to Apple App Store successfully.
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Perttu Lähteenlahti