Jacob’s Tech Tavern

Jacob's Tech Tavern is a Substack by the Lead Mobile Engineer at Gener8, offering insights into iOS software engineering, startup dynamics, career guidance, and mobile app development. It combines practical advice on app creation, career development, and technical deep dives into software and hardware architecture, with personal anecdotes and humor.

Software Engineering Startups Career Development Mobile App Development iOS Development User Experience Design Venture Capital Technology Trends Methodologies and Design Patterns Programming Languages Software Testing and Quality Assurance Productivity and Tools Technology History

The hottest Substack posts of Jacob’s Tech Tavern

And their main takeaways

A Tool To Automatically Detect Memory Leaks

1749 implied HN points • 24 Feb 25
🕹 Technology Software Development Programming Technology Trends IT
  1. Memory leaks can cause unexpected bugs in apps, like weird behavior or actions happening twice. It's important to find and fix them to improve user experience.
  2. There's a way to automatically detect memory leaks in apps with only about 30 lines of code. This saves time and helps avoid frustrating users.
  3. While some may enjoy the challenge of finding leaks manually, using automated tools can prevent a lot of headaches and keep product managers happier.

Secret SwiftUI: A practical use of _VariadicView

2842 implied HN points • 10 Feb 25
🕹 Technology Software Programming App Development User Interface Innovation
  1. The \\_VariadicView feature in SwiftUI helps create custom components like flexible tab bars and lists. It's useful for developers wanting more control over their UI elements.
  2. Finding real-world examples for \\_VariadicView can be tough, but it can significantly help in building complex UIs like chat applications.
  3. A specific application of \\_VariadicView is creating a reusable 'ChatList' component that manages scroll inversion, making it easier to handle messaging apps.

Make your social apps pop with LinkPresentation

874 implied HN points • 18 Feb 25
🕹 Technology Software Apps Development User Experience Design
  1. You can easily improve your social apps by adding better link previews. This makes sharing more visually appealing and user-friendly.
  2. Building support for hyperlink features in your app can be quick and simple. Many times, you can get it done during a lunch break.
  3. If you're in a fast-paced environment, it's often easier to create a proof of concept and refine it later. Don't be afraid to just jump in and start making changes.

JailBreak Protection on iOS

2624 implied HN points • 04 Feb 25
🕹 Technology Mobile Security Software Development Internet
  1. Jailbreaking on iOS means exploiting security flaws to gain more control over the device. This allows users to install apps outside of Apple's approval process and customize their phones more freely.
  2. While jailbreaking can be fun, it can also make devices less secure. People can easily install tools that can read private app data, leading to security risks.
  3. Developers should consider adding jailbreak protection to their apps. This helps safeguard sensitive information and prevents unauthorized access, keeping both the app and user safer.
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Softcore Debugging

2405 implied HN points • 21 Jan 25
🕹 Technology Software Development Debugging Tools Programming
  1. Xcode has many built-in debugging tools that can help developers troubleshoot their apps. It's helpful to explore these tools to find new ways to fix issues.
  2. Conditional breakpoints can make debugging more efficient by allowing developers to stop the app under specific conditions. This saves time during the debugging process.
  3. Learning faster LLDB commands and memory graph traversal techniques can enhance a developer's ability to diagnose issues quickly. Familiarizing yourself with these options can improve coding skills.

Hardcore Debugging

2842 implied HN points • 13 Jan 25
🕹 Technology Software Debugging Development Engineering Programming
  1. Bugs in apps can sometimes be easy to fix, but some problems are hidden deep in the system and harder to find. These serious issues can cause crashes that are tricky to solve.
  2. When dealing with a crash, you can use tools like Git Bisect to look back in time or symbolicate crash logs to find out what went wrong. These methods help narrow down the problem.
  3. Understanding how crashes occur in the kernel memory management can take time, but specific techniques exist to make debugging easier and faster. It's all about using the right tools at the right time.

The Synchronization Framework in Swift 6

3936 implied HN points • 30 Dec 24
🕹 Technology Software Programming Development Concurrency Frameworks
  1. Swift 6 introduced a new Synchronization framework that includes features like Mutex and Atomics. These help manage how different parts of a program can work together safely.
  2. The new concurrency tools are based on a concept called generic ownership, which is new for Swift 6. This means they have better performance and flexibility.
  3. The article also compares these new low-level features to high-level ones like Actors to see how they perform. This can help developers choose the right tool for their needs.

Static, Dynamic, Mergeable, oh, my!

7872 implied HN points • 18 Nov 24
🕹 Technology Software Development Programming Frameworks Libraries
  1. Libraries are just code you use in your projects. There are two types: static and dynamic, which impact how they are linked to your app.
  2. Dynamic linking happens at runtime, making builds faster but can slow down app launch times. Static linking copies everything into the app, which can make the app bigger but loads faster.
  3. Mergeable libraries combine the benefits of both static and dynamic linking, aiming to speed up builds while keeping app launch times quick.

The Swift Compiler

2624 implied HN points • 24 Dec 24
🕹 Technology Programming Software Development Computing Code
  1. The Swift language was created by Chris Lattner, who also developed LLVM when he was just 23 years old. That's really impressive given how complex these technologies are!
  2. It's important to understand what type of language Swift is, whether it's compiled or interpreted, especially for job interviews in tech. Knowing this can help you stand out.
  3. Learning about the Swift compiler can help you appreciate the language's features and advantages better, making you a stronger developer overall.

Solving The SwiftUI Interview

2186 implied HN points • 10 Dec 24
🕹 Technology Software Programming Interviews Coding Swift
  1. Understanding SwiftUI is crucial for coding interviews, especially for positions focused on iOS development. It helps you stand out as a candidate.
  2. Practicing Swift Concurrency will give you an edge in solving problems more efficiently during interviews. It's an important skill that employers value.
  3. Interviews don't have to be stressful or frustrating. Using structured approaches can make the process smoother and more enjoyable for both candidates and interviewers.

A Tech Interview that Doesn't Suck

2186 implied HN points • 02 Dec 24
🕹 Technology Software Engineering Hiring Interviews Skills
  1. Hiring great team members is really important because it affects everyone's work speed. Good hires help the team, while bad ones slow everyone down.
  2. Many tech companies rely on LeetCode tests to screen candidates, but this method might not show true skills. There could be better ways to assess coding abilities.
  3. Finding a more effective hiring process can improve how companies choose candidates, leading to better outcomes for teams. It's all about making informed decisions.

What is a Crash?

3498 implied HN points • 04 Nov 24
🕹 Technology Software Programming Mobile App Development Operating Systems
  1. A crash happens when an app unexpectedly stops, but it can actually be a safety measure to prevent bigger problems. Think of it like a controlled explosion that protects your device.
  2. There are two main types of crashes: those caused by the Swift Runtime and those from the XNU Kernel. Each has its own reasons for triggering a crash to protect the system.
  3. Crashes don't just cause inconvenience; they are there to protect users from worse issues, like losing data or compromising security. They help keep everything safe even when things go wrong.

Advanced Swift Concurrency

2624 implied HN points • 12 Nov 24
🕹 Technology Programming Software Development Concurrency Coding
  1. Swift Concurrency is a modern way to handle tasks in Swift, making it easier and more powerful compared to earlier methods like GCD. It's designed for simplicity and efficiency.
  2. Important concepts in Swift Concurrency include Task properties like priority, cancellation, and timeout settings. Understanding these helps developers manage their applications better.
  3. Using Task effectively allows developers to create more responsive and dynamic apps. It’s great to explore real-life examples to grasp how to implement these advanced features.

The Swift Runtime: Your Silent Partner

1312 implied HN points • 16 Dec 24
🕹 Technology Programming Software Development Open Source Tech Trends
  1. The Swift Runtime, known as libswiftCore, is a C++ library that helps run Swift programs by managing essential features like memory and error handling.
  2. This library works alongside your Swift code, linking dynamically when you launch your app, which is why it's mentioned as running 'alongside'.
  3. By exploring the code within libswiftCore, you can learn how core Swift features are implemented at a deeper level, which can help you understand the language better.

The Time Profiler

656 implied HN points • 07 Jan 25
🕹 Technology Software Development Tools Performance iOS
  1. The Time Profiler is an essential tool for improving iOS app performance. It helps find and fix slow parts of your code.
  2. It can identify specific issues like animation delays or overheating in your app. This makes it easier to solve performance problems.
  3. Learning how to use the Time Profiler effectively can lead to faster, smoother apps that users will enjoy more.

My Wronggest Content

656 implied HN points • 26 Nov 24
🕹 Technology Social media Software Development Marketing Content creation Programming
  1. Posting wrong code online can lead to getting helpful feedback from others. Sometimes people are quick to point out mistakes, but that can help you learn.
  2. Using social media regularly can grow your audience. Posting interesting and engaging content helps attract more subscribers.
  3. Accepting criticism is important. It can be tough to hear people say your work is bad, but it's a chance to improve and grow.

My Toddler Loves Planes, So I Built Her A Radar

1304 HN points • 27 Nov 23
🕹 Technology App Development User Experience API Integration Mobile Apps Software Development
  1. The idea for the app came from the author's toddler's fascination with planes, leading to the creation of a radar app.
  2. The app was built to be engaging and fun for kids, with features like showing nearby flights and being oriented correctly.
  3. The author went through user testing with their toddler to ensure the app was enjoyable and successful before launching it on the App Store.

I Wrote a Guest Post for Emerge Tools!

656 implied HN points • 26 Feb 24
🕹 Technology Apps Tools iOS Engineering Startups
  1. The blog post compares the Twitter and X iOS app binaries, revealing insights like extra app icons and heavy use of dynamic libraries.
  2. Emerge Tools offers valuable solutions for mobile engineers to monitor their app's size and performance.
  3. The author recommends subscribing to Jacob's Tech Tavern for more insightful posts and to show support for the work.

Through the Ages: Apple CPU Architecture

194 HN points • 30 Oct 23
🕹 Technology Hardware
  1. Apple has undergone multiple CPU architecture migrations throughout its history, showcasing a unique ability to adapt and innovate.
  2. Intel's x86 architecture dominance was driven by innovations like CPU caches, branch prediction, and superscalar architecture.
  3. The M1 chip from Apple Silicon stands out due to its specialized heterogeneous computing approach, unified memory architecture, out-of-order execution, and physical proximity of components for efficient performance.

Apple Animation Through the Ages: 2007

218 implied HN points • 12 Sep 23
🕹 Technology Animation Frameworks Graphics Development
  1. In 2007, Apple introduced Core Animation, revolutionizing how animations were implemented on Mac OS X.
  2. Core Animation streamlined animation implementation by providing a declarative framework that leveraged the GPU for smooth transitions.
  3. Developers could easily create animations with Core Animation properties like frame, border, filters, and opacity.

The 2FA app that tells you when you get `012345`

35 HN points • 19 Feb 24
🕹 Technology Mobile Apps Development Software Bug Fixing
  1. The app's creator derived inspiration for the 2FA app from spotting interesting patterns in the codes, like counting sequences and repeated numerical patterns.
  2. The concept was proven through a proof of concept demonstrating local code generation and push notifications for rare interesting codes.
  3. The app development process included tackling challenges like storing multiple 2FA accounts securely, implementing interestingness features, and improving performance with optimized processing tasks and notifications.

Mobile DevOps for Enterprise that Just Works

3 HN points • 15 Jan 24
🕹 Technology Development DevOps Enterprise Automation Mobile
  1. Mobile DevOps for Enterprise can be challenging due to the unique requirements and constraints of mobile development.
  2. Appcircle offers a more streamlined and user-friendly approach to setting up CI/CD pipelines, especially for mobile projects.
  3. Appcircle provides advantages such as simplified infrastructure management, faster build speeds, comprehensive permissions management, and features like tester management and enterprise app store.

High Performance Swift Apps

2 HN points • 04 Mar 24
🕹 Technology Programming Performance optimization Mobile Apps
  1. Testing on a real device to identify user-facing problems is crucial for improving app performance.
  2. Profiling the app using Instruments to identify bottlenecks and implementing targeted code improvements based on the findings can significantly enhance performance.
  3. Improving processing speed, utilizing parallelism, and optimizing code to run earlier during app launch are key strategies for enhancing the performance of Swift apps.

Modular Architecture for Apps

2 HN points • 01 Jan 24
🕹 Technology Mobile Apps Software Engineering
  1. Architectural discussions should focus on how modules fit together and organizational structures.
  2. Different modular architecture approaches offer benefits like clear responsibilities and reduced build times.
  3. As apps become more complex, modularization becomes necessary for managing team, complexity, and build time challenges.

Advanced async testing: Unstructured concurrency

3 HN points • 01 Aug 23
🕹 Technology Unit Testing Concurrency
  1. Unstructured concurrency introduces a different approach to handling asynchronous code compared to structured concurrency like async/await.
  2. When dealing with unstructured concurrency like Tasks, testing can become challenging and may require using XCTestExpectation to handle closure-based asynchronous operations.
  3. To overcome testing challenges with unstructured concurrency, leverage mocks, the defer keyword, and XCTestExpectation to ensure precise test execution.