collectLatest

@ExperimentalCoroutinesApi suspend fun <T> Flow<T>.collectLatest(
    action: suspend (value: T) -> Unit
): Unit
(source)

Terminal flow operator that collects the given flow with a provided action. The crucial difference from collect is that when the original flow emits a new value, action block for previous value is cancelled.

It can be demonstrated by the following example:

flow {
    emit(1)
    delay(50)
    emit(2)
}.collectLatest { value ->
    println("Collecting $value")
    delay(100) // Emulate work
    println("$value collected")
}

prints “Collecting 1, Collecting 2, 2 collected”