November 2022
Beginner to intermediate
544 pages
12h 39m
Korean
Content preview from 자바에서 코틀린으로
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270
자바에서 코틀린으로
예제
13.27
[
streams
-
to
-
sequences
.
15
:
src
/
main
/
java
/
travelator
/
analytics
/
MarketingAnalytics
.
kt
]
fun averageNumberOfEventsPerCompletedBooking(
timeRange: String
): Double {
return allEventsInSameInteractions(
eventStore
.queryAsSequence(“type=CompletedBooking&timerange=$timeRange”)
)
.groupBy { event ->
event[“interactionId”] as String
}.values
.averageBy { it.size }
}
private fun allEventsInSameInteractions(
sequence: Sequence<MutableMap<String, Any?>>
) = sequence
.flatMap { event ->
val interactionId = event[“interactionId”] as String
eventStore
.queryAsSequence(“interactionId=$interactionId”)
}
이 코드는 정말 못생겼지만
allEventsInSameInteractions ...