public static IResultEnumerable <TResult, TFailure> SelectMany <TSuccess, TFailure, TBind, TResult>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, Result <TBind, TFailure> > bind, Func <TSuccess, TBind, TResult> resultSelector)
where TSuccess : notnull
where TFailure : notnull
where TBind : notnull
where TResult : notnull
{
if (bind == null)
{
throw new ArgumentNullException(nameof(bind));
}
if (resultSelector == null)
{
throw new ArgumentNullException(nameof(resultSelector));
}
return(source
.Select(result => result
.Match(success =>
bind
.Invoke(success)
.Map(value => resultSelector.Invoke(success, value)),
Result.Failure <TResult, TFailure>
)
)
.AsResultEnumerable());
}
public static IResultEnumerable <TSuccess, TFailure> Where <TSuccess, TFailure>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, Result <Unit, TFailure> > failurePredicate)
=> source
.Select(value => value
.Bind(success => failurePredicate
.Invoke(success)
.Select(_ => success)
)
)
.AsResultEnumerable();
public static IResultEnumerable <TSuccess, TFailure> Where <TSuccess, TFailure>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, Result <Unit, TFailure> > failurePredicate)
=> source
.Select((Func <Result <TSuccess, TFailure>, Result <TSuccess, TFailure> >)(value => value
.Bind((Func <TSuccess, Result <TSuccess, TFailure> >)(success => (Result <TSuccess, TFailure>)ResultExtensions.Map <Unit, TFailure, TSuccess>(failurePredicate
.Invoke((TSuccess)success)
, (Func <Unit, TSuccess>)(_ => (TSuccess)success)))
))
)
.AsResultEnumerable();
public static IResultEnumerable <TResult, TFailure> Select <TSuccess, TResult, TFailure>(this IResultEnumerable <TSuccess, TFailure> source, Func <TSuccess, TResult> selector)
{
if (selector == null)
{
throw new ArgumentNullException(nameof(selector));
}
return(source
.Select(result => result
.Match(
success => Result.Success <TResult, TFailure>(selector.Invoke(success)),
Result.Failure <TResult, TFailure>
)
)
.AsResultEnumerable());
}