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Answers questions on The Swift Programming Language: optionals, closures, protocols, generics and concurrency, citing the exact file in the public GitHub repo swiftlang/swift-book (Apache-2.0). Not an official Swift product.
How do optionals and optional binding work?
What is the difference between a struct and a class?
How do async/await and actors work?
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Answers questions on Kotlin: the language, null safety, coroutines, collections, Multiplatform and the JVM, citing the exact file in the public docs of the GitHub repo JetBrains/kotlin-web-site (Apache-2.0). Not an official Kotlin product.
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