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Easy Haptic Feedback Generator 📳. 

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NSUserDefaults is a go-to database for saving users' preferences. Learn how to populate it with your default values.

We use API availability checks all the time, but have you wondered how the Swift compiler handles this?
UserDefaults are often used to alter flows in the app and store state. Using launch arguments we can adjust these values for development.

Swift was introduced a couple of years ago at Apple's 2014 WWDC. Over the years I analyzed iOS to measure how many built-in applications were using Swift.
Tools & Libraries
A much faster version of JSONDecoder. 

Swift 5.3 is now officially released! 🎉

To understand monoids, we must first begin with semigroups.