Resources, insights, and stories

Hendrik was an engineer who could describe software but never build it. Here’s how he learned iOS development and shipped 4 apps on the App Store.

A structured, lesson-by-lesson guide to learning the Swift programming language. Each lesson takes about 30 minutes, includes real code you can run, and ends with a challenge to test yourself.

Your app froze. The spinner is spinning and spinning. You can’t click anything. Somewhere in your code, a loop is running forever — and now you need to understand why.

Some code decisions are simple enough to fit on one line. The Swift ternary operator is how you write them.

You’ve probably never thought about what happens to a variable after you’re done using it. The consume operator lets you tell Swift exactly when you’re finished, and the compiler will hold you to it.

You’ve probably used a singleton without realizing it. Every time you write UserDefaults.standard or URLSession.shared, that’s a singleton at work.