flatMapLatest

inline fun <T, R> Flow<T>.flatMapLatest(crossinline transform: suspend (T) -> Flow<R>): Flow<R>

Returns a flow that switches to a new flow produced by transform function every time the original flow emits a value. When the original flow emits a new value, the previous flow produced by transform block is cancelled.

For example, the following flow:

flow {
emit("a")
delay(100)
emit("b")
}.flatMapLatest { value ->
flow {
emit(value)
delay(200)
emit(value + "_last")
}
}

produces a b b_last

This operator is buffered by default and size of its output buffer can be changed by applying subsequent buffer operator.

Sources

common source
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