I can highly recommend building your own falling sand simulator. It's really fun to see how such simple rules create emergent behaviors. Sand pixels try to move down, then diagonally down. Water does the same, then tries sideways.

Me messing around with it eventually resulted in a game I'm now working on full time (think Noita meets Factorio): https://store.steampowered.com/app/2764460/Sandustry/

I recently started working for a startup, and they wanted an app.

What I shipped was a react native app (so I don't need to go in to Xcode to build), that renders a full screen web browser that points to our website. I've sprinkled in bits of injected JS to capture our cookies and local/session storage - which then gets saved to device storage and reinjected on app startup.

There are a few native-ish bits sprinkled in - onboarding, notifications, error screens, loading indicators, etc - but for the most part we don't need to worry about our API borking old versions (which is moving extraordinarily fast).

The only semi tricky bit was native auth integration - that needs treated with a bit more care, and stored securely, but it took a few days.

I ship the app to TestFlight and the AppStore using Fastlane from the command line, match handles the certs, and I never have to open Xcode.

It is honestly bliss, and i've heard a lot of app developers moving to this model (interestingly it normally follows a failed SDUX implementation)

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I remember when escaping SQL input data was "the correct way" to use your mysql database. Parametrization? Nah, just use mysql_escape_string or whatever it was called.