public static IPromise <ISet <T> > ToSet <T>(IPromiseEnumerator <T> items, IEqualityComparer <T> comparer)
{
return(ReduceAlgorithm.Reduce(items, (prev, current) =>
{
prev.Add(current);
return prev;
}, (ISet <T>)(new HashSet <T>(comparer))));
}
public static IPromise <List <T> > ToList <T>(IPromiseEnumerator <T> items)
{
return(ReduceAlgorithm.Reduce(items, (prev, current) =>
{
prev.Add(current);
return prev;
}, new List <T>()));
}
public static IPromise <long> LongCount <T>(IPromiseEnumerator <T> items, Func <T, int, IPromise <bool> > filter)
{
return(ReduceAlgorithm.Reduce <T, long>(items, (prev, current, index) =>
{
return filter(current, index).Then(pick =>
{
if (pick)
{
return prev + 1;
}
return prev;
});
}, 0));
}
public static IPromise <T> LastOrDefault <T>(IPromiseEnumerator <T> items, T defaultValue)
{
return(ReduceAlgorithm.Reduce(items, (prev, current) => current, defaultValue));
}
public static IPromise <IPromiseEnumerator <T> > Each <T>(IPromiseEnumerator <T> items, Func <T, int, IPromise> action)
{
return(ReduceAlgorithm.Reduce(items, (prev, current, index) => action(current, index).Immediately.Then(() => items), items));
}