reactor-core/src/main/java/reactor/core/publisher/ParallelFlux.java
public final <U> U as(Function<? super ParallelFlux<T>, U> converter) {
		return converter.apply(this);
	}
public final <U> U as(Function<? super ParallelFlux<T>, U> converter) {
		return converter.apply(this);
	}
Perform a fluent transformation to a value via a converter function which receives
this ParallelFlux.

@param <U> the output value type
@param converter the converter function from {@link ParallelFlux} to some type

@return the value returned by the converter function