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felixchez/gist:7a3154985b5321ff019b03c6b7c3e205

Created December 12, 2018 19:32
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kotlin_notnullable_function_callback
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gistfile1.txt
fun doAsyncOperation(val onCallback: (String) -> Unit?) {
// do lengthy computation operation
onCallback("result")
}
===
doAsyncOperation { _ -> }
doAsyncOperation {result -> Log.v(result)}
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