vknabel
vknabel
Valentin Knabel
Developer, cyclist, coffee nerd, human. Open Source, kindness, honesty, vegan. It is fine to be imperfect, as long as we are honest and have fun along the way.
Latest Posts
Once you have decided you want to create your own programming language, you need to create a broader concept. Every programming language is unique in its own way. Your goal is to find out in which way. And you need to find your reason...
This is planned to be a series of blog posts about designing and developing my own programming language, where I want to share some pitfalls, my learnings, design decisions, experience and the development process. While this series will...
When iterating over an array of objects in Angular, the change detection compares the references of the objects to detect changes. If the object reference now change too, like when updating local data from the network, Angular will...
You can run your Go program or your tests with the Data Race detection enabled. This might cost some performance and memory, but in case a data race is being detected, that’s worth it! Perfect for your CI! go run --race ./cmd/app go test...
I have never done anything productive with Kubernetes before. But it is a really tough topic to get started with. It’s overwhelming. Luckily I found an excellent Kubernetes tutorial on Youtube. I made some personal notes while watching....
Iterating over a map in Go is not predictable. This is a design decision to avoid relying on memory layout. for k, v := range map { // always prints different results! fmt.Printf("%s: %s\n", k, v) }
I had completely forgotten about NSDataAsset. Maybe I should move some of my JSON files into asset catalogs. According to @emergetools that should remove some code signing overhead from the app size. Tweet by @simonbs
When using auto layout with a UIScrollView, subviews may not attach to the top edge of the scroll view’s parent. Else you cannot scroll, but the handle shrinks the more you scroll. Setting left and right is ok to fix the width if you do...
Starting with Swift 5.6 the Swift Package Manager can automatically detect Breaking API changes. Really great for libs! https://twitter.com/fabianfett/status/1504393754412822530?s=12
Async tests do not work on Linux, only on macOS. Instead you need to implement a helper function that runs the test async by relying on expectations. https://www.swiftbysundell.com/articles/unit-testing-code-that-uses-async-await/
Cookies in WKWebView are broken. When manually setting a Cookie using the Configuration, it will be ignored by the web view. Workaround: add a UserScript with the following code: document.cookies = 'cookie_optin=essential:1|analytics:0'...
Sometimes you need your local IP address on the command line to automatically pass it to a script. ifconfig en0 |awk '/inet / {print $2; }'
If the default Table Of Contents / Index Set for iOS does not fit your use cases. This library might be interesting: https://iosexample.com/table-of-contents-selector-built-with-swift/
Back in 2019 I wrote an article about how to debug your Swift Package Manager projects in Visual Studio Code. In late december 2021, the Swift Server Working group released a brand new extension for vscode, which dramatically improves...
In case your UINavigationBar has been set to a custom color and the navigation bar is not translucent, you will experience a visual regression when updating to Xcode 13. The navigation bar background will be black - until you start...