public static IAsyncObservable <TSource> First <TSource>(this IAsyncObservable <TSource> source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
return(Create <TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.First(observer))));
}
public static IAsyncObservable <TSource> First <TSource>(this IAsyncObservable <TSource> source, Func <TSource, ValueTask <bool> > predicate)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (predicate == null)
{
throw new ArgumentNullException(nameof(predicate));
}
return(Create <TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.First(observer, predicate))));
}