Alexander Udalov
10 lines
265 B
Kotlin
Vendored
10 lines
265 B
Kotlin
Vendored
// FULL_JDK
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import java.util.*
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import java.util.stream.Stream
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fun <T> Stream<T>?.getIfSingle() =
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this?.map { Optional.ofNullable(it) }
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?.reduce(Optional.empty()) { _, _ -> Optional.empty() }
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?.orElse(null) // <<---- should not be an error
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