Kotlin
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In Kotlin, There Are No Primitives
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Kotlin's when Is the New switch — And if, And instanceof
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Kotlin Smart Casts: Stop Telling the Compiler What It Already Knows
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A Kotlin Class Is Mostly Its Header
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One Keyword Does the Work: Kotlin's data, enum, sealed, and object
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Enums in Kotlin: Small, Useful, and More Powerful Than They Look
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Unchecked and Unbothered: How Kotlin Rethinks Java's Exception Handling
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A Kotlin Lambda Is Just a Value
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Kotlin Lambdas Get Clever: References, Receivers, and inline