https://kotlinlang.org/api/core/kotlin-stdlib/kotlin.jvm.optionals/
kotlin.jvm.optionals | Core API – Kotlin Programming Language
core apiprogramming languagekotlinjvmoptionals
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https://www.codecademy.com/learn/learn-swift-optionals
Learn Swift: Optionals | Codecademy
Learn how to define functions and handle values that might be absent using optionals in Swift.
learn swiftoptionalscodecademy