How it's built

James Thomson has been maintaining PCalc for over 20 years. How do you write code that survives two decades? Well, you don't but how do you make it less painful? Learn about the natural selection process leading PCalc to have the engine separated from the UI, and how it came handy many years later. Custom UI, accessibility, easter eggs, and the ultimate question of universe: is calculator app a good business? - this episode has something for everyone. Links: James Thomson @jamesthomson PCalc DragThing An Illustrated History of Easter Eggs Dice Chapters: 00:00 Intro 00:34 History Of PCalc 05:45 UI / Engine separation 12:22 Architecture 13:34 State machine 17:31 Cross-platform 19:19 In-depth state machine 22:54 Case for encapsulation of numeric types 25:44 Reverse engineering a calculator 27:48 UI theming 39:19 Representing numbers 43:12 Unit conversion engine 47:03 Work from home, year schedule 48:41 Importance of learning 53:02 Investing time 54:19 Art for PCalc 56:53 About screen 1:03:33 Dice app as a testbed 1:06:04 Testing and accessibility 1:14:13 Cross-platform 1:19:18 Business of selling a calculator app 1:26:42 iOS community 1:33:41 Closing remarks

Radek Pietruszewski has been working at Nozbe for 8 years building out an industry leading productivity tool. Nozbe places high value in making its tools available across all the platforms, which dictated an interesting technological choices. Looking forward to your feedback on twitter: @zats LINKS: * Radek Pietruszewski * Nozbe * WatermelonDB * ZACS CHAPTERS: 00:00 Intro 05:23 React vs ReactNative 08:29 Build a New Screen in React 09:18 Styling 11:12 Routing 13:40 Dependency Injection 16:04 Testing vs Dogfooding 19:17 Adding New Native Features to React Native 22:13 Performance 27:01 Offline-first Approach 29:30 Reactive UI 31:04 Conflict resolution 34:13 Networking 36:12 Storage 38:23 Dark Mode Support 42:47 IDEs 46:18 Zero Abstraction Cost Styling 50:02 Making great apps in React Native 54:58 Outro

Ryan Nystrom is a Director of Engineering at GitHub where he's supporting several teams building mobile and desktop apps. In this episode we discussed a broad range of topics from UI, and GraphQL to custom navigation framework, and responder chain. EPISODE LINKS: Ryan Nystrom https://twitter.com/_ryannystrom GitHawk https://github.com/GitHawkApp/GitHawk GitHub for Mobile https://github.com/mobile GitHub Feedback https://github.com/github/feedback Work at GitHub https://github.com/about/careers Chapters: 00:00 Intro 03:24 Manager writing code 05:05 In-app Navigation 09:33 Responder Chain 10:55 App State & Dependency Injection 15:12 Storyboards vs programmatic UI 19:45 SwiftUI 21:46 Networking 26:18GraphQL 28:14 Cache 32:56 Polling 34:41 iOS 13-Compatible Sidebar 39:51 Catalyst vs Electron 41:42 Web UI 46:29 Roadmap 50:40 Client Analytics 54:22 Dogfooding vs Feature Preview 55:42 Open Source 57:35 Outro

Bridger Maxwell is the engineer behind Scribble Together - a collaborative drawing app. In this episode we discuss general software architecture, networking, and drawing aspects of the app. EPISODE LINKS: Bridger Maxwell https://twitter.com/bridgermax May-Li Khoe https://twitter.com/mayli Scribble Together https://scribbletogether.com Origami Studio https://origami.design Chapters: 0:00 Intro 1:07 About the app 3:13 Core architecture, conflict resolution 13:59 Swift on the Server 17:34 Networking 24:23 In-app navigation 26:20 Shape recognition 32:50 Touch processing, model persistence 39:02 Dependency injection 40:06 Web-sockets 42:39 Future plans 43:48 OpenGL and Metal vs CALayers and CoreGraphics 46:52 Outro