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SylvainHocq/rx pair with previous

Created February 11, 2020 13:02
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rx pair with previous
fun <TSource> Observable<TSource>.pairWithPrevious()
: Observable<Pair<TSource?, TSource?>> {
return this
.map {
Pair(null as TSource?, it)
}
.scan { acc: Pair<TSource?, TSource?>, current: Pair<TSource?, TSource?> ->
Pair(acc.second, current.second)
}
}
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