public static Task <Option <TResult> > SelectMany <TValue, TBind, TResult>(this Option <TValue> option, Func <TValue, Task <Option <TBind> > > bind, Func <TValue, TBind, Task <TResult> > resultSelector)
{
if (bind == null)
{
throw new ArgumentNullException(nameof(bind));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(option.BindAsync(value => bind
.Invoke(value)
.SelectAsync(obj => resultSelector.Invoke(value, obj))
));
}
public static Task <Option <TValue> > Where <TValue>(this Option <TValue> source, Func <TValue, Task <Option <Unit> > > failurePredicate)
=> source
.BindAsync(success => failurePredicate
.Invoke(success)
.Select(_ => success)
);