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Preventing Surprisingly Large Objective-C Type Encodings
Objective-C stores type encoding in the binary. These encodings can become surprisingly large.

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Articles
When dealing with dictionaries and arrays in Swift, it's very important to know that any reference types used as a key or value will be retained by default.

Reactive programming has become increasingly popular within the Apple developer community over the last few years.
Google's plans on making Swift the first mainstream language with first-class language-integrated differentiable programming capabilities.
Validating views in different states.
This post describes the goals, release process, and estimated schedule for Swift 5.3.

Tools & Libraries
Bugsnatch is a lightweight bug reporting iOS library written in Swift. It creates a bug report template by collecting application and device information.

Other
Contact Tracing makes it possible to combat the spread of the COVID-19 virus.