public static IPromise <double> Average(this IPromiseEnumerable <long> items)
{
return(items.Sum().Then(sum => items.Count().Then(count => ((double)sum) / ((double)count))));
}
public static IPromise <double> Sum(this IPromiseEnumerable <double?> items)
{
return(items.Sum(x => x.HasValue ? x.Value : (double)0));
}
public static IPromise <decimal> Sum(this IPromiseEnumerable <decimal?> items)
{
return(items.Sum(x => x.HasValue ? x.Value : (decimal)0));
}
public static IPromise <float> Sum(this IPromiseEnumerable <float?> items)
{
return(items.Sum(x => x.HasValue ? x.Value : (float)0));
}
public static IPromise <long> Sum(this IPromiseEnumerable <long?> items)
{
return(items.Sum(x => x.HasValue ? x.Value : (long)0));
}
