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felixchez/gist:422b992c63546362089836d787076038

Created December 12, 2018 19:21
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kotlin_nullable_function_callback
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gistfile1.txt
fun doAsyncOperation(val onCallback: ((String) -> Unit)? = null) {
// do lengthy computation operation
onCallback?.invoke("result")
}
===
doAsyncOperation()
doAsyncOperation {result -> Log.v(result)}
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