kotlin-coroutines-stories-09-suspend-function-sumThreeRandomNumbers.kt

fun sumIsEvenAsync() = async {
    val sum = sumThreeRandomNumbers(OPERATION_IS_EVEN)
    log("$OPERATION_IS_EVEN: Sum = $sum")
    sum % 2 == 0
}

fun sumAverageAsync() = async {
    val sum = sumThreeRandomNumbers(OPERATION_AVERAGE)
    log("$OPERATION_AVERAGE: Sum = $sum")
    sum.toFloat() / 3
}

fun sumSquareAsync() = async {
    val sum = sumThreeRandomNumbers(OPERATION_SQUARE)
    log("$OPERATION_SQUARE: Sum = $sum")
    sum * sum
}

private suspend fun sumThreeRandomNumbers(operation: String): Int {
    val r1 = async { myRandomNumberSuccess(operation) }
    val r2 = async { myRandomNumberSuccess(operation) }
    val r3 = async { myRandomNumberSuccess(operation) }

    return r1.await() + r2.await() + r3.await()
}