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StuStirling/FlowablePreviousAndLatest.kt

Created February 16, 2021 08:46
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Flowable that emits previous item as well as latest.
Raw
FlowablePreviousAndLatest.kt
data class PreviousAndLatest<T>(
var previous: T?,
var latest: T?
) {
fun addLatest(newLatest: T): PreviousAndLatest<T> {
if (latest != null) previous = latest
latest = newLatest
return this
}
}
flowable
.distinctUntilChanged()
.scanWith({ PreviousAndLatest<RandomClass>(null, null) }, { previous, latest ->
previous.addLatest(latest)
})
.filter { it.latest != null }
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