defer

Creates a Flow that, on collection, calls a Flow factory to make a Flow for each new FlowCollector.

In some circumstances, waiting until the last minute (that is, until collection time) to generate the Flow can ensure that collectors receive the freshest data.

Example of usage:

suspend fun remoteCall1(): R1 = ...
suspend fun remoteCall2(r1: R1): R2 = ...

fun example1(): Flow<R2> = defer {
  val r1 = remoteCall1()
  val r2 = remoteCall2(r1)
  flowOf(r2)
}

fun example2(): Flow<R1> = defer { flowOf(remoteCall1()) }