arrow-fx-coroutines / arrow.fx.coroutines.stream / firstOrError

firstOrError

suspend fun <O> Stream<O>.firstOrError(): O

Runs the first effect of this Stream, raising a NoSuchElementException if the stream emitted no values and returns the value if emitted.

This a terminal operator, meaning this functions suspends until the Stream finishes. If any errors are raised while streaming, it’s thrown from this suspend scope.