public static T Sum <T>(
this IExpressionEvaluator <T> evaluator,
IEnumerable <T> values
) where T : struct, IComparable <T>, IEquatable <T> =>
values.Aggregate(evaluator.GetValue(0), (carry, current) => evaluator.Add(carry, current));
public static T Product <T>(
this IExpressionEvaluator <T> evaluator,
IEnumerable <T> values
) where T : struct, IComparable <T>, IEquatable <T> =>
values.Aggregate(evaluator.GetValue(1), (carry, current) => evaluator.Multiply(carry, current));