when would you return null for Unit?

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[adams2]

when would you return null for Unit?

[orangy]

doAnswer2 defines answer as returning T? which is nullable of T. You specify Unit as type parameter, so your lambda should return Unit?, nullable Unit. Which can be either null or Unit (singleton instance). Kotlin can automatically provide Unit when needed, and optimize it to void on JVM, but when it’s Unit? it can’t.